%% EPIQ - Recherche - %% 2021-01-25 @ARTICLE{CQEDReview2020, author = {A. Blais, A.L. Grimsmo, S.M. Girvin and A. Wallraff}, title = {Circuit Quantum Electrodynamics}, journal = {Review of Modern Physics (accepted)}, keywords = {Quantum Physics}, year = {2020}, month = {may}, eid = {arXiv:2005.12667}, pages = {arXiv:2005.12667}, archivePrefix = {arXiv}, eprint = {2005.12667}, primaryClass = {quant-ph}, adsurl = {https://ui.adsabs.harvard.edu/abs/2020arXiv200512667B}, adsnote = {Provided by the SAO/NASA Astrophysics Data System}, local-url = {CQEDReview2020.pdf}} @article{CQED_NatPhys_Review, Abstract = {Since the first observation of coherent quantum behaviour in a superconducting qubit, now more than 20 years ago, there have been substantial developments in the field of superconducting quantum circuits. One such advance is the introduction of the concepts of cavity quantum electrodynamics (QED) to superconducting circuits, to yield what is now known as circuit QED. This approach realizes in a single architecture the essential requirements for quantum computation, and has already been used to run simple quantum algorithms and to operate tens of superconducting qubits simultaneously. For these reasons, circuit QED is one of the leading architectures for quantum computation. In parallel to these advances towards quantum information processing, circuit QED offers new opportunities for the exploration of the rich physics of quantum optics in novel parameter regimes in which strongly nonlinear effects are readily visible at the level of individual microwave photons. We review circuit QED in the context of quantum information processing and quantum optics, and discuss some of the challenges on the road towards scalable quantum computation.}, Author = {A. Blais, S. M. Girvin and W. D. Oliver}, Da = {2020/03/01}, Date-Added = {2020-04-21 10:28:29 -0400}, Date-Modified = {2020-04-21 10:28:29 -0400}, Doi = {10.1038/s41567-020-0806-z}, Id = {Blais2020}, Isbn = {1745-2481}, Journal = {Nature Physics}, Number = {3}, Pages = {247--256}, Title = {Quantum information processing and quantum optics with circuit quantum electrodynamics}, Ty = {JOUR}, Url = {https://doi.org/10.1038/s41567-020-0806-z}, Volume = {16}, Year = {2020}, local-url = {CQED_NatPhys_Review.pdf}} @ARTICLE{Photodetection2020, author = {A. L. Grimsmo, B. Royer, J.M. Kreikebaum, Y. Ye, K. O'Brien, I. Siddiqi and A. Blais}, title = {Quantum metamaterial for nondestructive microwave photon counting}, journal = {arXiv e-prints}, keywords = {Quantum Physics}, year = {2020}, month = {may}, eid = {arXiv:2005.06483}, pages = {arXiv:2005.06483}, archivePrefix = {arXiv}, eprint = {2005.06483}, primaryClass = {quant-ph}, adsurl = {https://ui.adsabs.harvard.edu/abs/2020arXiv200506483G}, adsnote = {Provided by the SAO/NASA Astrophysics Data System}, local-url = {Photodetection2020.pdf}} @article{paolo2019variational, title = {Variational quantum simulation of ultrastrong light-matter coupling}, author = {Agustin Di Paolo, Panagiotis Kl. Barkoutsos, Ivano Tavernelli, and Alexandre Blais}, journal = {Phys. Rev. Research}, volume = {2}, issue = {3}, pages = {033364}, numpages = {14}, year = {2020}, month = {Sep}, publisher = {American Physical Society}, doi = {10.1103/PhysRevResearch.2.033364}, url = {https://link.aps.org/doi/10.1103/PhysRevResearch.2.033364}, local-url={VQO.pdf}} @ARTICLE{QOCA, author={Alexandre Choquette and Agustin Di Paolo and Panagiotis Kl. Barkoutsos and David Sénéchal and Ivano Tavernelli and Alexandre Blais}, title = {Quantum-optimal-control-inspired ansatz for variational quantum algorithms}, journal = {arXiv e-prints}, keywords = {Quantum Physics}, year = {2020}, month = {aug}, eid = {arXiv:2008.01098}, pages = {arXiv:2008.01098}, archivePrefix = {arXiv}, eprint = {2008.01098}, primaryClass = {quant-ph}, adsurl = {https://ui.adsabs.harvard.edu/abs/2020arXiv200801098C}, adsnote = {Provided by the SAO/NASA Astrophysics Data System}, local-url = {QOCA.pdf}} @article{SwitchingKerr, title = {Quantum Versus Classical Switching Dynamics of Driven Dissipative Kerr Resonators}, author = {Christian Kraglund Andersen, Archana Kamal, Nicholas A. Masluk, Ioan M. Pop, Alexandre Blais and Michel H. Devoret}, journal = {Phys. Rev. Applied}, volume = {13}, issue = {4}, pages = {044017}, numpages = {16}, year = {2020}, month = {Apr}, publisher = {American Physical Society}, doi = {10.1103/PhysRevApplied.13.044017}, url = {https://link.aps.org/doi/10.1103/PhysRevApplied.13.044017}, local-url = {SwitchingKerr.pdf}} @article{Bifluxon, title = {Bifluxon: Fluxon-Parity-Protected Superconducting Qubit}, author = {Kalashnikov, Konstantin and Hsieh, Wen Ting and Zhang, Wenyuan and Lu, Wen-Sen and Kamenov, Plamen and Di Paolo, Agustin and Blais, Alexandre and Gershenson, Michael E. and Bell, Matthew}, journal = {PRX Quantum}, volume = {1}, issue = {1}, pages = {010307}, numpages = {15}, year = {2020}, month = {Sep}, publisher = {American Physical Society}, doi = {10.1103/PRXQuantum.1.010307}, url = {https://link.aps.org/doi/10.1103/PRXQuantum.1.010307}, local-url={bifluxon.pdf}} @article{fggeGate, title = {Demonstration of an All-Microwave Controlled-Phase Gate between Far-Detuned Qubits}, author = {Krinner, S. and Kurpiers, P. and Royer, B. and Magnard, P. and Tsitsilin, I. and Besse, J.-C. and Remm, A. and Blais, A. and Wallraff, A.}, journal = {Phys. Rev. Applied}, volume = {14}, issue = {4}, pages = {044039}, numpages = {11}, year = {2020}, month = {Oct}, publisher = {American Physical Society}, doi = {10.1103/PhysRevApplied.14.044039}, url = {https://link.aps.org/doi/10.1103/PhysRevApplied.14.044039}, local-url={fggeGate.pdf}} @article{QAOA-ContinuousGates2020, title = {Improving the Performance of Deep Quantum Optimization Algorithms with Continuous Gate Sets}, author = {Lacroix, Nathan and Hellings, Christoph and Andersen, Christian Kraglund and Di Paolo, Agustin and Remm, Ants and Lazar, Stefania and Krinner, Sebastian and Norris, Graham J. and Gabureac, Mihai and Heinsoo, Johannes and Blais, Alexandre and Eichler, Christopher and Wallraff, Andreas}, journal = {PRX Quantum}, volume = {1}, issue = {2}, pages = {110304}, numpages = {16}, year = {2020}, month = {Oct}, publisher = {American Physical Society}, doi = {10.1103/PRXQuantum.1.020304}, url = {https://link.aps.org/doi/10.1103/PRXQuantum.1.020304}, local-url = {QAOA-ContinuousGates.pdf}} @ARTICLE{Microwave_quantum_link, author={Paul Magnard, Simon Storz, Philipp Kurpiers, Josua Schär, Fabian Marxer, Janis Lütolf, Jean-Claude Besse, Mihai Gabureac, Kevin Reuer, Abdulkadir Akin, Baptiste Royer, Alexandre Blais and Andreas Wallraff}, title = {Microwave Quantum Link between Superconducting Circuits Housed in Spatially Separated Cryogenic Systems}, journal = {Phys. Rev. Lett.}, volume = {125}, issue = {26}, pages = {260502}, numpages = {7}, year = {2020}, month = {Dec}, publisher = {American Physical Society}, doi = {10.1103/PhysRevLett.125.260502}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.125.260502}, local-url = {Microwave_quantum_link.pdf}} @article{BiasPreservingCats, author = {Puri, Shruti and St-Jean, Lucas and Gross, Jonathan A. and Grimm, Alexander and Frattini, Nicholas E. and Iyer, Pavithran S. and Krishna, Anirudh and Touzard, Steven and Jiang, Liang and Blais, Alexandre and Flammia, Steven T. and Girvin, S. M.}, journal = {Science Advances}, number = {34}, title = {Bias-preserving gates with stabilized cat qubits}, volume = {6}, year = {2020}, local-url ={BiasPreservingCats.pdf}} @ARTICLE{Dysolve, author = {R. Shillito, J. Gross, A. Di Paolo, E. Genois and A. Blais}, title = {Fast and differentiable simulation of driven quantum systems}, journal = {arXiv e-prints}, keywords = {Quantum Physics}, year = {2020}, month = {dec}, eid = {arXiv:2012.09282}, pages = {arXiv:2012.09282}, archivePrefix = {arXiv}, eprint = {2012.09282}, primaryClass = {quant-ph}, adsurl = {https://ui.adsabs.harvard.edu/abs/2020arXiv201209282S}, localurl = {Dysolve.pdf}, local-url = {Dysolve.pdf}} @ARTICLE{Gyenis2019a, author = {A. Gyenis, P. S. Mundada, A. Di Paolo, T. Hazard, X. You, D. Schuster, J. Koch,A. Blais, A. A. Houck}, title = {Experimental realization of an intrinsically error-protected superconducting qubit}, journal = {arXiv e-prints}, keywords = {Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics}, year = {2019}, month = {Oct}, eid = {arXiv:1910.07542}, pages = {arXiv:1910.07542}, archivePrefix = {arXiv}, eprint = {1910.07542}, primaryClass = {quant-ph}, adsurl = {https://ui.adsabs.harvard.edu/abs/2019arXiv191007542G}, adsnote = {Provided by the SAO/NASA Astrophysics Data System}, local-url = {0pi-princeton.pdf}} @article{Paolo_2019, doi = {10.1088/1367-2630/ab09b0}, url = {https://doi.org/10.1088%2F1367-2630%2Fab09b0}, year = {2019}, month = {apr}, publisher = {{IOP} Publishing}, volume = {21}, number = {4}, pages = {043002}, author = {Agustin Di Paolo, Arne L Grimsmo, Peter Groszkowski, Jens Koch and Alexandre Blais}, title = {Control and coherence time enhancement of the 0{\textendash}$\uppi$ qubit}, journal = {New Journal of Physics}, abstract = {Kitaev‚Äôs 0‚ÄìœÄ qubit encodes quantum information in two protected, near-degenerate states of a superconducting quantum circuit. In a recent work, we have shown that the coherence times of a realistic 0‚ÄìœÄ device can surpass that of today‚Äôs best superconducting qubits (Groszkowski et al 2018 New J. Phys. 20 043053). Here we address controllability of the 0‚ÄìœÄ qubit. Specifically, we investigate the potential for dispersive control and readout, and introduce a new, fast and high-fidelity single-qubit gate that can interpolate smoothly between logical X and Z. We characterize the action of this gate using a multi-level treatment of the device, and analyze the impact of circuit-element disorder and deviations in control and circuit parameters from their optimal values. Furthermore, we propose a cooling scheme to decrease the photon shot-noise dephasing rate, which we previously found to limit the coherence times of 0‚ÄìœÄ devices within reach of current experiments. Using this approach, we predict coherence time enhancements between one and three orders of magnitude, depending on parameter regime.}, local-url={0pi-control.pdf}} @misc{KP19a, Author = {Anirudh Krishna and David Poulin}, Eprint = {arXiv:1909.07419}, Title = {Topological wormholes}, Year = {2019}, local-url = {KP19a.pdf}} @misc{KP19b, Author = {Anirudh Krishna and David Poulin}, Eprint = {1909.07424}, Title = {Fault-tolerant gates on hypergraph product codes}, Year = {2019}, local-url = {KP19b.pdf}} @article{QuantumCanada, doi = {10.1088/2058-9565/ab029d}, url = {https://doi.org/10.1088%2F2058-9565%2Fab029d}, year = {2019}, month = {feb}, publisher = {IOP Publishing}, volume = {4}, number = {2}, pages = {020503}, author = {Ben Sussman, Paul Corkum, Alexandre Blais, David Cory and Andrea Damascelli}, title = {Quantum Canada}, journal = {Quantum Science and Technology}, abstract = {Canada ranks among the world‚Äôs leading nations in quantum research, building on investments of more than $1 billion in the past decade alone. Canada‚Äôs amassed research expertise, growing private-sector impact, and government commitments to innovation and competitiveness, place the country in a strong position, as scientific advances drive quantum technology development. Here, we summarize the steps Canada has taken to build quantum research excellence and to support a growing quantum industrial base. We also discuss Canadian quantum community efforts to solidify and build the nation‚Äôs leadership, as the technology revolution unfolds.}, local-url ={QuantumCanada.pdf}} @article{WSPS18a, Abstract = {At the Mott transition, electron-electron interaction changes a metal, in which electrons are itinerant, to an insulator, in which electrons are localized. This phenomenon is central to quantum materials. Here we contribute to its understanding by studying the two-dimensional Hubbard model at finite temperature with plaquette cellular dynamical mean-field theory. We provide an exhaustive thermodynamic description of the correlation-driven Mott transition of the half-filled model by calculating pressure, charge compressibility, entropy, kinetic energy, potential energy and free energy across the first-order Mott transition and its high-temperature crossover (Widom line). The entropy is extracted from the Gibbs-Duhem relation and shows complex behavior near the transition, marked by discontinuous jumps at the first-order boundary, singular behavior at the Mott endpoint and inflections marking sharp variations in the supercritical region. The free energy allows us to identify the thermodynamic phase boundary, to discuss phases stability and metastability, and to touch upon nucleation and spinodal decomposition mechanisms for the transition. We complement this thermodynamic description of the Mott transition by an information-theoretic description. We achieve this by calculating the local entropy, which is a measure of entanglement, and the single-site total mutual information, which quantifies quantum and classical correlations. These information-theoretic measures exhibit characteristic behaviors that allow us to identify the first-order coexistence regions, the Mott critical endpoint and the crossovers along the Widom line in the supercritical region. }, Author = {C. Walsh and P. S{'e}mon and D. Poulin and G. Sordi and A. -M. S. Tremblay}, Eprint = {arXiv:1807.10409}, Journal = {Phys. Rev. B}, Pages = {075122}, Title = {Thermodynamic and information-theoretic description of the Mott transition in the two-dimensional Hubbard model}, Volume = {99}, Year = {2019}, local-url = {WSPS18c.pdf}} @article{WSPS18b, Abstract = {Entanglement and information are powerful lenses to probe phases transitions in many-body systems. Motivated by recent cold atom experiments, which are now able to measure the corresponding information-theoretic quantities, we study the Mott transition in the half-filled two-dimensional Hubbard model using cellular dynamical mean-field theory, and focus on two key measures of quantum correlations: entanglement entropy and mutual information. We show that they detect the first-order nature of the transition, the universality class of the endpoint, and the crossover emanating from the endpoint.}, Author = {C. Walsh and P. S{'e}mon and D. Poulin and G. Sordi and A. -M. S. Tremblay}, Eprint = {arXiv:1807.10408}, Journal = {Phys. Rev. Lett.}, Pages = {067203}, Title = {Entanglement entropy and mutual information across the Mott transition in the two-dimensional Hubbard model}, Volume = {122}, Year = {2019}, local-url = {WSPS18d.pdf}} @article{PMH18a, Abstract = { Motivated by the growing interest in self-correcting quantum memories, we study the feasibility of self-correction in classical lattice systems composed of bounded degrees of freedom with local interactions. We argue that self-correction, including a requirement of stability against external perturbation, cannot be realized in system with broken global symmetries such as the 2d Ising model, but that systems with local, i.e. gauge, symmetries have the required properties. Previous work gave a three-dimensional quantum system which realized a self-correcting classical memory. Here we show that a purely classical three dimensional system, Wegner's 3D Ising lattice gauge model, can also realize this self-correction despite having an extensive ground state degeneracy. We give a detailed numerical study to support the existence of a self-correcting phase in this system, even when the gauge symmetry is explicitly broken. More generally, our results obtained by studying the memory lifetime of the system are in quantitative agreement with the phase diagram obtained from conventional analysis of the system's specific heat, except that self-correction extends beyond the topological phase, past the lower critical temperature.}, Author = {David Poulin and Roger G. Melko and Matthew B. Hastings}, Eprint = {arXiv:1812.03936}, Journal = {Phys. Rev. B}, Pages = {094103}, Title = {Self-correction in Wegner's 3D Ising lattice gauge theory}, Volume = {99}, Year = {2019}, Local-url = {PMH19a.pdf}} @ARTICLE{DMRG_SCCircuits, author = {{Di Paolo}, Agustin and {Baker}, Thomas E. and {Foley}, Alexandre and {S{'e}n{'e}chal}, David and {Blais}, Alexandre}, title = {Efficient modeling of superconducting quantum circuits with tensor networks}, journal = {arXiv e-prints}, keywords = {Quantum Physics}, year = {2019}, month = {Dec}, eid = {arXiv:1912.01018}, pages = {arXiv:1912.01018}, archivePrefix = {arXiv}, eprint = {1912.01018}, primaryClass = {quant-ph}, adsurl = {https://ui.adsabs.harvard.edu/abs/2019arXiv191201018D}, adsnote = {Provided by the SAO/NASA Astrophysics Data System}, loca-url = {DMRG_SCCircuits.pdf}, local-url = {DMRG_SCCircuits.pdf}} @article{Kurpiers2019a, title = {Quantum Communication with Time-Bin Encoded Microwave Photons}, author = {P. Kurpiers, M. Pechal, B. Royer, P. Magnard, T. Walter, J. Heinsoo, Y. Salath\'e, A. Akin, S. StorzJ.-C. Besse, S. Gasparinetti, A. Blais and A. Wallraff}, journal = {Phys. Rev. Applied}, volume = {12}, issue = {4}, pages = {044067}, numpages = {11}, year = {2019}, month = {Oct}, publisher = {American Physical Society}, doi = {10.1103/PhysRevApplied.12.044067}, url = {https://link.aps.org/doi/10.1103/PhysRevApplied.12.044067}, local-url = {TimeBinZurich.pdf}} @ARTICLE{transmon-QD-ETH, Author = {Scarlino, P. and van Woerkom, D. J. and Mendes, U. C. and Koski, J. V. and Landig, A. J. and Andersen, C. K. and Gasparinetti, S. and Reichl, C. and Wegscheider, W. and Ensslin, K. and Ihn, T. and Blais, A. and Wallraff, A.}, Da = {2019/07/08}, Date-Added = {2019-08-25 11:11:33 -0400}, Date-Modified = {2019-08-25 11:11:33 -0400}, Doi = {10.1038/s41467-019-10798-6}, Id = {Scarlino2019}, Isbn = {2041-1723}, Journal = {Nature Communications}, Number = {1}, Pages = {3011}, Title = {Coherent microwave-photon-mediated coupling between a semiconductor and a superconducting qubit}, Ty = {JOUR}, Url = {https://doi.org/10.1038/s41467-019-10798-6}, Volume = {10}, Year = {2019}, local-url = {transmon-QD-ETH.pdf}} @article{NanowireFluxonium, title = {Nanowire Superinductance Fluxonium Qubit}, author = {T. M Hazard, A. Gyenis, A. Di Paolo, A. T. Asfaw, S. A Lyon, A. Blais, A. A. Houck}, journal = {Phys. Rev. Lett.}, volume = {122}, issue = {1}, pages = {010504}, numpages = {6}, year = {2019}, month = {Jan}, publisher = {American Physical Society}, doi = {10.1103/PhysRevLett.122.010504}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.122.010504}, local-url = {NanowireFluxonium.pdf}}} @article{SIS_amplifier, title = {Parametric amplification and squeezing with an ac- and dc-voltage biased superconducting junction}, author = {U.C. Mendes, S. Jezouin, P. Joyez, B. Reulet, A. Blais, F. Portier, C. Mora and C. Altimiras}, journal = {Phys. Rev. Applied}, volume = {11}, issue = {3}, pages = {034035}, numpages = {13}, year = {2019}, month = {Mar}, publisher = {American Physical Society}, doi = {10.1103/PhysRevApplied.11.034035}, url = {https://link.aps.org/doi/10.1103/PhysRevApplied.11.034035}, local-url = {SIS_amplifier.pdf}} @article{LP18a, Abstract = {Belief-propagation (BP) decoders play a vital role in modern coding theory, but they are not suitable to decode quantum error-correcting codes because of a unique quantum feature called error degeneracy. Inspired by an exact mapping between BP and deep neural networks, we train neural BP decoders for quantum low-density parity-check (LDPC) codes with a loss function tailored to error degeneracy. Training substantially improves the performance of BP decoders for all families of codes we tested and may solve the degeneracy problem which plagues the decoding of quantum LDPC codes.}, Author = {Ye-Hua Liu and David Poulin}, Eprint = {arXiv:1811.07835}, Journal = {Phys. Rev. Lett.}, Pages = {200501}, Title = {Neural Belief-Propagation Decoders for Quantum Error-Correcting Codes}, Volume = {122}, Year = {2019}, local-url = {LP19a.pdf}} @article{BPS18a, Abstract = {Foliated quantum codes are a resource for fault-tolerant measurement-based quantum error correction for quantum repeaters and for quantum computation. They represent a general approach to integrating a range of possible quantum error correcting codes into larger fault-tolerant networks. Here we present an ecient heuristic decoding scheme for foliated quantum codes, based on message passing between primal and dual code `sheets'. We test this decoder on two different families of sparse quantum error correcting code: turbo codes and bicycle codes, and show reasonably high numerical performance thresholds. We also present a construction schedule for building such code states.}, Author = {A. Bolt and D. Poulin and T. M. Stace}, Journal = {Phys. Rev. A}, Volume = {98}, Pages = {062302}, Title = {Decoding Schemes for Foliated Sparse Quantum Error Correcting Codes }, Year = {2018}, local-url = {BPS18a.pdf}} @ARTICLE{SpinStrongCouplingETH, author = {A. J. Landig, J. V. Koski, P. Scarlino, U. C. Mendes, A. Blais, C. Reichl, W. Wegscheider, A. Wallraff, K. Ensslin, T. Ihn}, Abstract = {Electron spins hold great promise for quantum computation because of their long coherence times. Long-distance coherent coupling of spins is a crucial step towards quantum information processing with spin qubits. One approach to realizing interactions between distant spin qubits is to use photons as carriers of quantum information. Here we demonstrate strong coupling between single microwave photons in a niobium titanium nitride high-impedance resonator and a three-electron spin qubit (also known as a resonant exchange qubit) in a gallium arsenide device consisting of three quantum dots. We observe the vacuum Rabi mode splitting of the resonance of the resonator, which is a signature of strong coupling; specifically, we observe a coherent coupling strength of about 31 megahertz and a qubit decoherence rate of about 20 megahertz. We can tune the decoherence electrostatically to obtain a minimal decoherence rate of around 10 megahertz for a coupling strength of around 23 megahertz. We directly measure the dependence of the qubit--photon coupling strength on the tunable electric dipole moment of the qubit using the `AC Stark'effect. Our demonstration of strong qubit--photon coupling for a three-electron spin qubit is an important step towards coherent long-distance coupling of spin qubits.}, Da = {2018/07/25}, Date-Added = {2018-07-25 19:26:49 +0000}, Date-Modified = {2018-07-25 19:26:49 +0000}, Doi = {10.1038/s41586-018-0365-y}, Id = {Landig2018}, Isbn = {1476-4687}, Journal = {Nature}, Title = {Coherent spin--photon coupling using a resonant exchange qubit}, Ty = {JOUR}, Url = {https://doi.org/10.1038/s41586-018-0365-y}, Year = {2018}, Bdsk-Url-1 = {https://doi.org/10.1038/s41586-018-0365-y}, local-url={SpinStrongCouplingETH.pdf}} @article{DP18a, Abstract = {A quantum error correcting protocol can be substantially improved by taking into account features of the physical noise process. We present an ecient decoder for the surface code which can account for general noise features, including coherences and correlations. We demonstrate that the decoder signicantly outperforms the conventional matching algorithm on a variety of noise models, including non-Pauli noise and spatially correlated noise. The algorithm is based on an approximate calculation of the logical channel using a tensor-network description of the noisy state.}, Author = {Andrew S. Darmawan and David Poulin}, Eprint = {arXiv:1801.01879}, Journal = {Phys. Rev. E}, Pages = {051302(R)}, Title = {An ecient general decoding algorithm for the surface code}, Volume = {97}, Year = {2018}, Local-url = {DP18b.pdf}} @misc{GK18a, Author = {Antoine Grospellier and Anirudh Krishna }, Date-Added = {2018-10-10 13:06:00 +0000}, Date-Modified = {2018-10-10 13:06:58 +0000}, Eprint = {arXiv:1810.03681}, Title = {Numerical study of hypergraph product codes}, Year = {2018}, local-url ={GK18a.pdf}} @article{PhysRevLett.120.203602, title = {Itinerant Microwave Photon Detector}, author = {B. Royer, A.L. Grimsmo, A. Choquette-Poitevin, A. Blais}, journal = {Phys. Rev. Lett.}, volume = {120}, issue = {20}, pages = {203602}, numpages = {6}, year = {2018}, month = {May}, publisher = {American Physical Society}, doi = {10.1103/PhysRevLett.120.203602}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.120.203602}, local-url = {PhotonDetector.pdf}} @article {Royereaau1695, author = {Baptiste Royer, Shruti Puri and Alexandre Blais}, title = {Qubit parity measurement by parametric driving in circuit QED}, volume = {4}, number = {11}, elocation-id = {eaau1695}, year = {2018}, doi = {10.1126/sciadv.aau1695}, publisher = {American Association for the Advancement of Science}, abstract = {Multiqubit parity measurements are essential to quantum error correction. Current realizations of these measurements often rely on ancilla qubits, a method that is sensitive to faulty two-qubit gates and that requires notable experimental overhead. We propose a hardware-efficient multiqubit parity measurement exploiting the bifurcation dynamics of a parametrically driven nonlinear oscillator. This approach takes advantage of the resonator{\textquoteright}s parametric oscillation threshold, which depends on the joint parity of dispersively coupled qubits, leading to high-amplitude oscillations for one parity subspace and no oscillation for the other. We present analytical and numerical results for two- and four-qubit parity measurements, with high-fidelity readout preserving the parity eigenpaces. Moreover, we discuss a possible realization that can be readily implemented with the current circuit quantum electrodynamics (QED) experimental toolbox. These results could lead to substantial simplifications in the experimental implementation of quantum error correction and notably of the surface code.}, URL = {http://advances.sciencemag.org/content/4/11/eaau1695}, eprint = {http://advances.sciencemag.org/content/4/11/eaau1695.full.pdf}, journal = {Science Advances}, local-url={parityparametric.pdf}} @misc{BTP18a, Abstract = {Arikan's recursive code construction was designed for memoryless channels, but was recently shown to also polarize channels with finite-state memory. The resulting successive cancellation decoder has a complexity that scales like the third power of the channel's memory size. Furthermore, the polar code construction was extended by replacing the block polarization kernel by a convoluted kernel. Here, we extend the polar code efficient decoding algorithm for channels with memory to the family of convolutional polar code. We use numerical simulations to study the performance of these algorithms for practically relevant code sizes and find that the convolutional structure outperforms the standard polar codes on a variety of channels with memory.}, Author = {Benjamin Bourassa and Maxime Tremblay and David Poulin }, Eprint = {arxiv:1805.09378}, Title = {Convolutional Polar Codes on Channels with Memory}, Year = {2018}, local-url = {BTP18a.pdf}} @article{CIP17a, Abstract = {We consider the problem of fault-tolerant quantum computation in the presence of slow error diagnostics, either caused by measurement latencies or slow decoding algorithms. Our scheme offers a few improvements over previously existing solutions, for instance it does not require active error correction and results in a reduced error-correction overhead when error diagnostics is much slower than the gate time. In addition, we adapt our protocol to cases where the underlying error correction strategy chooses the optimal correction amongst all Clifford gates instead of the usual Pauli gates. The resulting Clifford frame protocol is of independent interest as it can increase error thresholds and could find applications in other areas of quantum computation.}, Author = {Christopher Chamberland and Pavithran Iyer and David Poulin}, Date-Added = {2017-04-25 12:26:29 +0000}, Date-Modified = {2018-01-09 13:54:01 +0000}, Eprint = {arxiv:1704.06662}, Journal = {Quantum}, Pages = {43}, Title = {Fault-Tolerant Quantum Computing in the Pauli or Clifford Frame with Slow Error Diagnostics}, Volume = {2}, Year = {2018}, Local-url = {CIP17a.pdf}} @article{DSHT17a, Abstract = {We present two techniques that can greatly reduce the number of gates required to realize an energy measurement, with application to ground state preparation in quantum simulations. The first technique realizes that to prepare the ground state of some Hamiltonian, it is not necessary to implement the time-evolution operator: any unitary operator which is a function of the Hamiltonian will do. We propose one such unitary operator which can be implemented exactly, circumventing any Taylor or Trotter approximation errors. The second technique is tailored to lattice models, and is targeted at reducing the use of generic single-qubit rotations, which are very expensive to produce by standard fault tolerant techniques. In particular, the number of generic single-qubit rotations used by our method scales with the number of parameters in the Hamiltonian, which contrasts with a growth proportional to the lattice size required by other techniques.}, Author = {David Poulin and Alexei Kitaev and Damian S. Steiger and Matthew B. Hastings and Matthias Troyer}, Eprint = {arXiv:1711.11025}, Journal = {Phys. Rev. Lett}, Pages = {010501}, Title = {Quantum Algorithm for Spectral Measurement with a Lower Gate Count}, Volume = {121}, Year = {2018}, Local-url={PKSH17a.pdf}} @article{HHPW17b, Abstract = {Recently we proposed a family of magic state distillation protocols that obtains asymptotic performance that is conjectured to be optimal. This family depends upon several codes, called "inner codes" and "outer codes." We presented some small examples of these codes as well as an analysis of codes in the asymptotic limit. Here, we analyze such protocols in an intermediate size regime, using hundreds to thousands of qubits. We use BCH inner codes, combined with various outer codes. We extend our protocols by adding error correction in some cases. We present a variety of protocols in various input error regimes; in many cases these protocols require significantly fewer input magic states to obtain a given output error than previous protocols.}, Author = {Jeongwan Haah and Matthew B. Hastings and David Poulin and Dave Wecker}, Eprint = {arXiv:1709.02789}, Journal = {Quantum Inf. Comput.}, Keywords = {Distillation}, Pages = {114}, Title = {Magic State Distillation at Intermediate Size}, Volume = {18}, Year = {2018}, local-url = {HHPW17d.pdf}} @ARTICLE{Remote_entanglement, Author = {Kurpiers, P. and Magnard, P. and Walter, T. and Royer, B. and Pechal, M. and Heinsoo, J. and Salath{'e}, Y. and Akin, A. and Storz, S. and Besse, J. -C. and Gasparinetti, S. and Blais, A. and Wallraff, A.}, Da = {2018/06/01}, Date-Added = {2018-06-24 16:08:54 +0000}, Date-Modified = {2018-06-24 16:08:54 +0000}, Doi = {10.1038/s41586-018-0195-y}, Id = {Kurpiers2018}, Isbn = {1476-4687}, Journal = {Nature}, Number = {7709}, Pages = {264--267}, Title = {Deterministic quantum state transfer and remote entanglement using microwave photons}, Ty = {JOUR}, Url = {https://doi.org/10.1038/s41586-018-0195-y}, Volume = {558}, Year = {2018}, Bdsk-Url-1 = {https://doi.org/10.1038/s41586-018-0195-y}, local-url={Remote_entanglement.pdf}} @misc{TBP18a, Abstract = {Polar codes were introduced in 2009 by Arikan as the first efficient encoding and decoding scheme that is capacity achieving for symmetric binary-input memoryless channels. Recently, this code family was extended by replacing the block-structured polarization step of polar codes by a convolutional structure. This article presents a numerical exploration of this so-called convolutional polar codes family to find efficient generalizations of polar codes, both in terms of decoding speed and decoding error probability. The main conclusion drawn from our study is that increasing the convolution depth is more efficient than increasing the polarization kernel's breadth as previously explored.}, Author = {Maxime Tremblay and Benjamin Bourassa and David Poulin }, Date-Added = {2018-05-25 12:24:47 +0000}, Date-Modified = {2018-05-25 12:25:42 +0000}, Eprint = {arxiv:1805.09306}, Title = {Depth versus Breadth in Convolutional Polar Codes}, Year = {2018}, local-url = {TBP18a}} @ARTICLE{SpinStrongCouplingDelft, Author = {N. Samkharadze, G. Zheng, N. Kalhor, D. Brousse, A. Sammak, U. C. Mendes, A. Blais, G. Scappucci and L. M. K. Vandersypen}, Abstract = {To help develop quantum circuits, much effort has been directed toward achieving the strong-coupling regime by using gate-defined semiconductor quantum dots. Potentially, the magnetic dipole, or spin, of a single electron for use as a qubit has advantages over charge-photon coupling owing to its longer lifetime. Samkharadze et al. hybridized the electron spin with the electron charge in a double silicon quantum dot. This approach yielded strong coupling between the single electron spin and a single microwave photon, providing a route to scalable quantum circuits with spin qubits.Science, this issue p. 1123Long coherence times of single spins in silicon quantum dots make these systems highly attractive for quantum computation, but how to scale up spin qubit systems remains an open question. As a first step to address this issue, we demonstrate the strong coupling of a single electron spin and a single microwave photon. The electron spin is trapped in a silicon double quantum dot, and the microwave photon is stored in an on-chip high-impedance superconducting resonator. The electric field component of the cavity photon couples directly to the charge dipole of the electron in the double dot, and indirectly to the electron spin, through a strong local magnetic field gradient from a nearby micromagnet. Our results provide a route to realizing large networks of quantum dot{ extendash}based spin qubit registers.}, Doi = {10.1126/science.aar4054}, Eprint = {http://science.sciencemag.org/content/359/6380/1123.full.pdf}, Issn = {0036-8075}, Journal = {Science}, Number = {6380}, Pages = {1123--1127}, Publisher = {American Association for the Advancement of Science}, Title = {Strong spin-photon coupling in silicon}, Url = {http://science.sciencemag.org/content/359/6380/1123}, Volume = {359}, Year = {2018}, Bdsk-Url-1 = {http://science.sciencemag.org/content/359/6380/1123}, Bdsk-Url-2 = {https://doi.org/10.1126/science.aar4054}, local-url = {SpinStrongCouplingDelft.pdf}} @article{0pi-coherence, author = {P. Groszkowski, A. Di Paolo, A. L. Grimsmo, A. Blais, D. I. Schuster, A. A. Houck, J. Koch}, Journal = {New Journal of Physics}, Number = {4}, Pages = {043053}, title = {Coherence properties of the 0-pi qubit}, Url = {http://stacks.iop.org/1367-2630/20/i=4/a=043053}, Volume = {20}, Year = {2018}, Bdsk-Url-1 = {http://stacks.iop.org/1367-2630/20/i=4/a=043053}, local-url={0pi-coherence.pdf}} @ARTICLE{QubitResetETHZ, title = {Fast and Unconditional All-Microwave Reset of a Superconducting Qubit}, author = {P. Magnard, P. Kurpiers, B. Royer, T. Walter, J.-C. Besse, S. Gasparinetti, M. Pechal, J. Heinsoo, S. Storz, A. Blais, A. Wallraff}, journal = {Phys. Rev. Lett.}, volume = {121}, issue = {6}, pages = {060502}, numpages = {6}, year = {2018}, month = {Aug}, publisher = {American Physical Society}, doi = {10.1103/PhysRevLett.121.060502}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.121.060502}, local-url = {QubitResetETHZ.pdf}} @article{IP17a, Abstract = {As far as we know, a useful quantum computer will require fault-tolerant gates, and existing schemes demand a prohibitively large space and time overhead. We argue that a first generation quantum computer will be very valuable to design, test, and optimize fault-tolerant protocols tailored to the noise processes of the hardware. Our argument is essentially a critical analysis of the current methods envisioned to optimize fault-tolerant schemes, which rely on hardware characterization, noise modelling, and numerical simulations. We show that, even within a very restricted set of noise models, error correction protocols depend strongly on the details of the noise model. Combined to the intrinsic diculty of hardware characterization and of numerical simulations of fault-tolerant protocols, we arrive at the conclusion that the currently envisioned optimization cycle is of very limited scope. On the other hand, the direct characterization of a fault-tolerant scheme on a small quantum computer bypasses these diculties, and could provide a bootstrapping path to full-scale fault-tolerant quantum computation.}, Author = {Pavithran {Iyer Sridharan} and David Poulin}, Eprint = {arXiv:1711.04736}, Journal = {Quantum Sci. Technol.}, Pages = {030504}, Title = {A Small Quantum Computer is Needed to Optimize Fault-Tolerant Protocols}, Volume = {3}, Year = {2018}, local-url = {IP18a.pdf}} @article{twpa, Author = {A. L. Grimsmo and A. Blais}, Da = {2017/06/06}, Doi = {10.1038/s41534-017-0020-8}, Id = {Grimsmo2017}, Isbn = {2056-6387}, Journal = {npj Quantum Information}, Number = {1}, Pages = {20}, Title = {Squeezing and quantum state engineering with Josephson travelling wave amplifiers}, Ty = {JOUR}, Url = {https://doi.org/10.1038/s41534-017-0020-8}, Volume = {3}, Year = {2017}, local-url={twpa.pdf}} @misc{FHP17a, Author = {Andrew Ferris and Christoph Hirche and David Poulin}, Eprint = {arXiv:1704.00715}, Keywords = {Polar codes; Tensor networks}, Title = {Convolutional Polar Codes}, Year = {2017}, Local-URL = {FHP17a.pdf}, Abstract = {Arikan's Polar codes attracted much attention as the first efficiently decodable and capacity achieving codes. Furthermore, Polar codes exhibit an exponentially decreasing block error probability with an asymptotic error exponent upper bounded by 1/2. Since their discovery, many attempts have been made to improve the error exponent and the finite block-length performance, while keeping the bloc-structured kernel. Recently, two of us introduced a new family of efficiently decodable error-correction codes based on a recently discovered efficiently-contractible tensor network family in quantum many-body physics, called branching MERA. These codes, called branching MERA codes, include Polar codes and also extend them in a non-trivial way by substituting the bloc-structured kernel by a convolutional structure. Here, we perform an in-depth study of a particular example that can be thought of as a direct extension to Arikan's Polar code, which we therefore name Convolutional Polar codes. We prove that these codes polarize and exponentially suppress the channel's error probability, with an asymptotic error exponent log_2(3)/2 which is provably better than for Polar codes under successive cancellation decoding. We also perform finite block-size numerical simulations which display improved error-correcting capability with only a minor impact on decoding complexity.}} @article{DP16b, Abstract = {The surface code is a many-body quantum system, and simulating it in generic conditions is computationally hard. While the surface code is believed to have a high threshold, the numerical simulations used to establish this threshold are based on simplified noise models. We present a tensor-network algorithm for simulating error correction with the surface code under arbitrary local noise. Our simulation is exact within statistical fluctuations and we use it to study the threshold and the sub-threshold behaviour of the amplitude-damping and systematic rotation channels. We also compare these exact results to those obtained by making standard approximations to the noise models.}, Author = {Andrew S. Darmawan and David Poulin}, Date-Added = {2016-07-25 15:46:30 +0000}, Date-Modified = {2017-07-28 13:28:20 +0000}, Eprint = {arXiv:1607.06460}, Journal = {Phys. Rev. Lett.}, Keywords = {Topological QC}, Pages = {040502}, Title = {Tensor-network simulations of the surface code under realistic noise}, Volume = {119}, Year = {2017}, local-url = {DP16c.pdf}} @ARTICLE{LongitudinalGate, doi = {10.22331/q-2017-05-11-11}, url = {https://doi.org/10.22331/q-2017-05-11-11}, title = {Fast and high-fidelity entangling gate through parametrically modulated longitudinal coupling}, author = {Baptiste Royer, Arne L. Grimsmo, Nicolas Didier and Alexandre Blais}, journal = {{Quantum}}, publisher = {{Verein zur F{"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}}, volume = {1}, pages = {11}, month = {may}, year = {2017}, local-url ={LongitudinalGate.pdf}} @ARTICLE{JPA_high-order, title = {Effect of Higher-Order Nonlinearities on Amplification and Squeezing in Josephson Parametric Amplifiers}, author = {Boutin, Samuel and Toyli, David M. and Venkatramani, Aditya V. and Eddins, Andrew W. and Siddiqi, Irfan and Blais, Alexandre}, journal = {Phys. Rev. Applied}, volume = {8}, issue = {5}, pages = {054030}, numpages = {22}, year = {2017}, month = {Nov}, publisher = {American Physical Society}, doi = {10.1103/PhysRevApplied.8.054030}, url = {https://link.aps.org/doi/10.1103/PhysRevApplied.8.054030}, local-url = {JPA_high-order.pdf}} @article{UltraStrongArray, author = {C. Kraglund Andersen and A. Blais}, title={Ultrastrong coupling dynamics with a transmon qubit}, journal={New Journal of Physics}, volume={19}, number={2}, pages={023022}, url={http://stacks.iop.org/1367-2630/19/i=2/a=023022}, year={2017}, local-url={UltraStrongArray.pdf}} @article{circulatorJILA, title = {Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits}, author = {Chapman, Benjamin J. and Rosenthal, Eric I. and Kerckhoff, Joseph and Moores, Bradley A. and Vale, Leila R. and Mates, J. A. B. and Hilton, Gene C. and Lalumi`ere, Kevin and Blais, Alexandre and Lehnert, K. W.}, journal = {Phys. Rev. X}, volume = {7}, issue = {4}, pages = {041043}, numpages = {16}, year = {2017}, month = {Nov}, publisher = {American Physical Society}, doi = {10.1103/PhysRevX.7.041043}, url = {https://link.aps.org/doi/10.1103/PhysRevX.7.041043}, local-url= {circulatorJILA.pdf}} @article{squadd, author = {F. Beaudoin, A. Blais and W. A. Coish}, title={Hamiltonian engineering for robust quantum state transfer and qubit readout in cavity QED}, journal={New Journal of Physics}, volume={19}, number={2}, pages={023041}, url={http://stacks.iop.org/1367-2630/19/i=2/a=023041}, year={2017}, local-url={squadd.pdf}} @article{DP16a, Abstract = {While topological quantum computation is intrinsically fault-tolerant at zero temperature, it looses its topological protection at any finite temperature. We present a scheme to protect the information stored in a system supporting non-cyclic anyons against thermal and measurement errors. The correction procedure builds on the work of G'acs cite{Gacs_86} and Harrington cite{Harrington_04} and operates as a local cellular automaton. In contrast to previously studied schemes, our scheme is valid for both abelian and non-abelian anyons and accounts for measurement errors. We prove the existence of a fault-tolerant threshold and numerically simulate the procedure for a system of Ising anyons. The result of our simulations are consistent with a threshold between $10^{-4}$ and $10^{-3}$.}, Author = {Guillaume Dauphinais and David Poulin}, Eprint = {arXiv:1607.02159}, Journal = {Comm. Math. Phys.}, Pages = {519}, Title = {Fault-Tolerant Quantum Error Correction for non-Abelian Anyons}, Volume = {355}, Year = {2017}, local-url = {DP16a.pdf}} @article{CHARAC TUN JUN, Year = {2017}, Abstract = {}, title = {Characterization and control of charge transfer in a tunnel junction}, author = {J.-C. Forgues, G. Gasse, C. Lupien, B. Reulet}, journal = {Physica Status Solidi B, 1600619}} @article{REU-PHOT-17, Year = {2017}, Abstract = {}, title = {Photon-pair shot noise in electron shot noise}, author = {Jean-Olivier Simoneau, Stéphane Virally, Christian Lupien and Bertrand Reulet}, journal = {Phys. Rev. B 95, 060301(R)}} @article{HHPW17a, Author = {Jeongwan Haah and Matthew B. Hastings and David Poulin and Dave Wecker}, Eprint = {arXiv:1703.07847}, Journal = {Quantum}, Pages = {31}, Title = {Magic state distillation with low space overhead and optimal asymptotic input count}, Volume = {1}, Year = {2017}, Local-url = {HHPW17a.pdf}} @ARTICLE{CatStateKerr, Author = {Puri, Shruti and Boutin, Samuel and Blais, Alexandre}, Doi = {10.1038/s41534-017-0019-1}, Id = {Puri2017}, Isbn = {2056-6387}, Journal = {npj Quantum Information}, Number = {1}, Pages = {18}, Title = {Engineering the quantum states of light in a Kerr-nonlinear resonator by two-photon driving}, Ty = {JOUR}, Url = {http://dx.doi.org/10.1038/s41534-017-0019-1}, Volume = {3}, Year = {2017}, Bdsk-Url-1 = {http://dx.doi.org/10.1038/s41534-017-0019-1}, local-url = {CatStateKerr.pdf}} @article{OpenGrapeReset, title = {Resonator reset in circuit QED by optimal control for large open quantum systems}, author = {S. Boutin, C. Kraglund Andersen, J. Venkatraman, A.J. Ferris and A. Blais}, journal = {Phys. Rev. A}, volume = {96}, issue = {4}, pages = {042315}, numpages = {11}, year = {2017}, month = {Oct}, publisher = {American Physical Society}, doi = {10.1103/PhysRevA.96.042315}, url = {https://link.aps.org/doi/10.1103/PhysRevA.96.042315}, local-url={OpenGrapeReset.pdf}} @article{KerrAQC, Author = {S. Puri, C. K. Andersen, A. L. Grimsmo and A. Blais}, Date = {2017/06/08/online}, Day = {08}, L3 = {10.1038/ncomms15785; https://www.nature.com/articles/ncomms15785#supplementary-information}, M3 = {Article}, Month = {06}, Pages = {15785}, Journal={Nature Communications}, Title = {Quantum annealing with all-to-all connected nonlinear oscillators}, Ty = {JOUR}, Url = {http://dx.doi.org/10.1038/ncomms15785}, Volume = {8}, Year = {2017}, local-url={kerrAQC.pdf}} @article{BDPS16a, Abstract = {We show how to construct a large class of quantum error correcting codes, known as CSS codes, from highly entangled cluster states. This becomes a primitive in a protocol that foliates a series of such cluster states into a much larger cluster state, implementing foliated quantum error correction. We exemplify this construction with several familiar quantum error correction codes, and propose a generic method for decoding foliated codes. We numerically evaluate the error-correction performance of a family of finite-rate CSS codes known as turbo codes, finding that it performs well over moderate depth foliations. Foliated codes have applications for quantum repeaters and fault-tolerant measurement-based quantum computation. }, Author = {Andrew Bolt, Guillaume Duclos-Cianci, David Poulin and Tom M. Stace}, Eprint = {arXiv:1607.02579}, Journal = {Phys. Rev. Lett.}, Pages = {070501}, Title = {Foliated quantum error-correcting codes}, Volume = {117}, Year = {2016}, Local-url = {BDPS16b.pdf}} @article{QOMeso, title = {Quantum Optics Theory of Electronic Noise in Coherent Conductors}, author = {Arne L. Grimsmo, Farzad Qassemi, Bertrand Reulet and Alexandre Blais}, journal = {Phys. Rev. Lett.}, volume = {116}, issue = {4}, pages = {043602}, numpages = {5}, year = {2016}, month = {Jan}, publisher = {American Physical Society}, doi = {10.1103/PhysRevLett.116.043602}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.116.043602}, local-url={QO_meso.pdf}} @ARTICLE{MollowSqueezing, title = {Resonance Fluorescence from an Artificial Atom in Squeezed Vacuum}, author = {D. M. Toyli, A. W. Eddins, S. Boutin, S. Puri, D. Hover, V. Bolkhovsky, W. D. Oliver, A. Blais and I. Siddiqi}, journal = {Phys. Rev. X}, volume = {6}, issue = {3}, pages = {031004}, numpages = {13}, year = {2016}, month = {Jul}, publisher = {American Physical Society}, doi = {10.1103/PhysRevX.6.031004}, url = {http://link.aps.org/doi/10.1103/PhysRevX.6.031004}, local-url={MollowSqueezing.pdf}} @article{ZenoCQED, author={D.H. Slichter, C. Muller, R. Vijay, S.J. Weber, A. Blais and I. Siddiqi}, title={Quantum Zeno effect in the strong measurement regime of circuit quantum electrodynamics}, journal={New Journal of Physics}, volume={18}, number={5}, pages={053031}, url={http://stacks.iop.org/1367-2630/18/i=5/a=053031}, year={2016}, local-url={ZenoCQED.pdf}} @article{DIR MESUR, Year = {2016}, Abstract = {}, author = {E. Pinsolle, A. Rousseau, C. Lupien, B. Reulet}, title = {Direct measurement of the electron energy relaxation dynamics in metallic wires}, journal = {Phys. Rev. Lett. 116, 236601}} @article{NON CLASS RADIA, Year = {2016}, Abstract = {}, title = {Non-classical radiation emission by a coherent conductor}, author = {J.-C. Forgues, G. Gasse, C. Lupien, B. Reulet}, journal = {C.R. Physique 17, 718}} @article{BFP16a, Abstract = {We introduce a numerical method for identifying topological order in two-dimensional models based on one-dimensional bulk operators. The idea is to identify approximate symmetries supported on thin strips through the bulk that behave as string operators associated to an anyon model. We can express these ribbon operators in matrix product form and define a cost function that allows us to efficiently optimize over this ansatz class. We test this method on spin models with abelian topological order by finding ribbon operators for ℤd quantum double models with local fields and Ising-like terms. In addition, we identify ribbons in the abelian phase of Kitaev's honeycomb model which serve as the logical operators of the encoded qubit for the quantum error-correcting code. We further identify the topologically encoded qubit in the quantum compass model, and show that despite this qubit, the model does not support topological order. Finally, we discuss how the method supports generalizations for detecting nonabelian topological order. }, Author = {Jacob C. Bridgeman, Steven T. Flammia and David Poulin}, Date-Added = {2016-04-27 20:51:06 +0000}, Date-Modified = {2016-11-15 18:27:56 +0000}, Eprint = {arXiv:1603.02275}, Journal = {Phys. Rev. B}, Pages = {205123}, Title = {Detecting Topological Order with Ribbon Operators}, Volume = {94}, Year = {2016}, Local-url = {BFP16b.pdf}} @article{GAB-BEL-REU, Year = {2016}, Abstract = {}, author = {Mihajlo Vanević, Julien Gabelli, Wolfgang Belzig, and Bertrand Reulet}, journal = {Phys. Rev. B 93, 041416(R) }, title = {Electron and electron-hole wave functions in a driven quantum contact}} @misc{DIP16a, Author = {Nicolas Delfosse, Pavithran Iyer and David Poulin}, Abstract = {We consider a notion of relative homology (and cohomology) for surfaces with two types of boundaries. Using this tool, we study a generalization of Kitaev's code based on surfaces with mixed boundaries. This construction includes both Bravyi and Kitaev's and Freedman and Meyer's extension of Kitaev's toric code. We argue that our generalization offers a denser storage of quantum information. In a planar architecture, we obtain a three-fold overhead reduction over the standard architecture consisting of a punctured square lattice.}, Eprint = {arXiv:1606.7116}, Keywords = {LDPC; Topological QC}, Title = {Generalized surface codes and packing of logical qubits}, Year = {2016}, Local-url = {DIP16a.pdf}} @misc{DIP16b, Abstract = {Quantum information processors need to be protected against errors and faults. One of the most widely considered fault-tolerant architecture is based on surface codes. While the general principles of these codes are well understood and basic code properties such as minimum distance and rate are easy to characterize, a code's average performance depends on the detailed geometric layout of the qubits. To date, optimizing a surface code architecture and comparing different geometric layouts relies on costly numerical simulations. Here, we propose a benchmarking algorithm for simulating the performance of surface codes, and generalizations thereof, that runs in linear time. We implemented this algorithm in a software that generates performance reports and allows to quickly compare different architectures. }, Author = {Nicolas Delfosse, Pavithran Iyer and David Poulin}, Date-Added = {2016-11-15 18:31:35 +0000}, Date-Modified = {2016-11-15 18:34:18 +0000}, Eprint = {arXiv:1611.04256}, Title = {A linear-time benchmarking tool for generalized surface codes}, Year = {2016}, local-url = {DIP16b.pdf}} @article{RIPSqueezing, title = {High-Fidelity Resonator-Induced Phase Gate with Single-Mode Squeezing}, author = {Shruti Puri and Alexandre Blais}, journal = {Phys. Rev. Lett.}, volume = {116}, issue = {18}, pages = {180501}, numpages = {5}, year = {2016}, month = {May}, publisher = {American Physical Society}, doi = {10.1103/PhysRevLett.116.180501}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.116.180501}, local-url= {RIP-gate-Squeezing.pdf}} @article{STEJOCHRBER, Year = {2016}, Abstract = {}, author = {Stéphane Virally, Jean-Olivier Simoneau, Christian Lupien, Bertrand Reulet}, title = {Discrete photon statistics from continuous microwave measurements}, journal = {Phys. Rev. A 93, 043813}} @article{MAGNETO15, Year = {2015}, Abstract = {}, title = {Magnetomerty of micro-magnets with electrostatically-defined Hall bars}, author = {D. Lachance-Quirion, J. Camiran Lemyre, L. Bergeron, C. Sarra-Bournet and M. Pioro-Ladrière}, journal = {Applied Physics Letters 107, 223103}} @article{PHWW14a, Abstract = { The simulation of molecules is a widely anticipated application of quantum computers. However, recent studies have cast a shadow on this hope by revealing that the complexity in gate count of such simulations increases with the number of spin orbitals N as N^8, which becomes prohibitive even for molecules of modest size N = 100. This study was partly based on a scaling analysis of the Trotter step required for an ensemble of random artificial molecules. Here, we revisit this analysis and find instead that the scaling is closer to N^6 in worst case for real model molecules we have studied, indicating that the random ensemble fails to accurately capture the statistical properties of real-world molecules. Actual scaling may be significantly better than this due to averaging effects. We then present an alternative simulation scheme and show that it can sometimes outperform existing schemes, but that this possibility depends crucially on the details of the simulated molecule. We obtain further improvements using a version of the coalescing scheme of cite{WBCH13a}; this scheme is based on using different Trotter steps for different terms. The method we use to bound the complexity of simulating a given molecule is efficient, in contrast to the approach of cite{WBCH13a,HWBT14a} which relied on exponentially costly classical exact simulation.}, Author = {David Poulin, M.B. Hastings, Dave Wecker, Nathan Wiebe, Andrew C. Doherty and Matthias Troyer,}, Date-Added = {2014-06-19 17:31:01 +0000}, Date-Modified = {2015-03-31 13:42:48 +0000}, Journal = {Quant. Info. and Comp.}, Keywords = {Simulation}, Pages = {0361}, Title = {The Trotter Step Size Required for Accurate Quantum Simulation of Quantum Chemistry}, Volume = {15}, Year = {2015}, local-url = {PHWW14b.pdf}} @article{DP14a, Abstract = {In leading fault-tolerant quantum computing schemes, accurate transformation are obtained by a two-stage process. In a first stage, a discrete, universal set of fault-tolerant operations is obtained by error-correcting noisy transformations and distilling resource states. In a second stage, arbitrary transformations are synthesized to desired accuracy by combining elements of this set into a circuit. Here, we present a scheme which merges these two stages into a single one, directly distilling complex transformations. We find that our scheme can reduce the total overhead to realize certain gates by up to a few orders of magnitude. In contrast to other schemes, this efficient gate synthesis does not require computationally intensive compilation algorithms, and a straightforward generalization of our scheme circumvents compilation and synthesis altogether.}, Author = {G. Duclos-Cianci and D. Poulin}, Eprint = {arXiv:1403.5280}, Journal = {Phys. Rev. A}, Pages = {042315}, Title = {Reducing the quantum computing overhead with complex gate distillation}, Volume = {91}, Year = {2015}, local-url = {DP15a.pdf}} @article{IP13a, Abstract = {In this article we address the computational hardness of optimally decoding a quantum stabilizer code. Much like classical linear codes, errors are detected by measuring certain check operators which yield an error syndrome, and the decoding problem consists of determining the most likely recovery given the syndrome. The corresponding classical problem is known to be {NP-complete}, and a similar decoding problem for quantum codes is also known to be {NP-complete.} However, this decoding strategy is not optimal in the quantum setting as it does not take into account error degeneracy, which causes distinct errors to have the same effect on the code. Here, we show that optimal decoding of stabilizer codes is computationally much harder than optimal decoding of classical linear codes, it is {\#P.}}, Author = {Iyer, Pavithran and Poulin, David}, Date-Added = {2013-10-31 21:20:38 +0000}, Date-Modified = {2015-12-14 16:29:46 +0000}, Eprint = {arXiv:1310.3235}, Journal = {IEEE Trans. Info. Theor.}, Keywords = {Quantum Physics}, Pages = {5209}, Title = {Hardness of decoding quantum stabilizer codes}, Volume = {61}, Year = {2015}, local-url = {IP15a.pdf}} @article{ROBUST15, Year = {2015}, Abstract = {}, title = {Robust micromagnet design for fast electrical manipulations of single spins in quantum dots}, author = {J. Joneda, T. Otsuka, T. Takakura, M. Pioro-Ladrière, R. Brunner, H. Lu, T. Nakajima, T. Obata, A. Noiri, C. J. Palmstrom, A. C. Gossard and S. Tarucha}, journal = {Applied Physics Express 8, 084401}} @ARTICLE{Circulator1, title = {On-Chip Superconducting Microwave Circulator from Synthetic Rotation}, author = {J. Kerckhoff, K. Lalumi{`e}re, B. J. Chapman, A. Blais, A. and K. W. Lehnert}, journal = {Phys. Rev. Applied}, volume = {4}, issue = {3}, pages = {034002}, numpages = {14}, year = {2015}, month = {Sep}, publisher = {American Physical Society}, doi = {10.1103/PhysRevApplied.4.034002}, url = {http://link.aps.org/doi/10.1103/PhysRevApplied.4.034002}, local-url ={Circulator1.pdf}} @article{REULET-F-L-15, Year = {2015}, author = {Jean-Charles Forgues, Christian Lupien and Bertrand Reulet}, title = {Experimental Violation of Bell-like Inequalities By Electronic Shot Noise}, Journal = {Phys. Rev. Lett. 114, 130403 (2015)}} @article{REU-THI-GAB-LUP, Year = {2015}, Abstract = {}, author = {Karl Thibault, Julien Gabelli, Christian Lupien, and Bertrand Reulet}, journal = {Phys. Rev. Lett. 114, 236604}, title = {Pauli-Heisenberg Oscillations in Electron Quantum Transport}} @article{BERKARJULCHRI, Year = {2015}, Abstract = {}, author = {Karl Thibault, Julien Gabelli, Christian Lupien, and Bertrand Reulet}, title = {Electron thermal, quantum, shot, and photo-assisted noise: From spectroscopy to current-current correlator in time domain}, journal = {IEEE International Conference on Noise and Fluctuations (ICNF), Xian, China}} @ARTICLE{LongitudinalReadout, title = {Fast Quantum Nondemolition Readout by Parametric Modulation of Longitudinal Qubit-Oscillator Interaction}, author = {N. Didier, J Bourassa and A. Blais}, journal = {Phys. Rev. Lett.}, volume = {115}, issue = {20}, pages = {203601}, numpages = {5}, year = {2015}, month = {Nov}, publisher = {American Physical Society}, doi = {10.1103/PhysRevLett.115.203601}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.115.203601}, local-url={longitudinalreadout.pdf}} @article{TwoModeReadout, title = {Heisenberg-Limited Qubit Read-Out with Two-Mode Squeezed Light}, author = {Nicolas Didier, Archana Kamal, William D. Oliver, Alexandre Blais and Aashish A. Clerk}, journal = {Phys. Rev. Lett.}, volume = {115}, issue = {9}, pages = {093604}, numpages = {5}, year = {2015}, month = {Aug}, publisher = {American Physical Society}, doi = {10.1103/PhysRevLett.115.093604}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.115.093604}, local-url ={TwoModeReadout.pdf}} @misc{LYPP15a, Author = {Olivier Landon-Cardinal, Beni Yoshida, John Preskill and David Poulin}, Journal = {Phys. Rev. A}, Volume = {91}, Pages = {032303}, Eprint = {arXiv:1501.04112 }, Keywords = {Topological phase}, Title = {Perturbative instability of quantum memory based on effective long-range interactions}, Year = {2015}, Local-url = {LYPP15b.pdf}} @misc{WBP15a, Abstract = {We analyse a model for fault-tolerant quantum computation with low overhead suitable for situations where the noise is biased. The basis for this scheme is a gadget for the fault-tolerant preparation of magic states that enable universal fault-tolerant quantum computation using only Clifford gates that preserve the noise bias. We analyse the distillation of |T⟩-type magic states using this gadget at the physical level, followed by concatenation with the 15-qubit quantum Reed-Muller code, and comparing our results with standard constructions. In the regime where the noise bias (rate of Pauli Z errors relative to other single-qubit errors) is greater than a factor of 10, our scheme has lower overhead across a broad range of relevant noise rates. }, Author = {Paul Webster, Stephen D. Bartlett and David Poulin}, Date-Added = {2015-12-14 19:40:37 +0000}, Date-Modified = {2015-12-14 19:42:32 +0000}, Eprint = { arXiv:1509.05032}, Journal = {Phys. Rev. A}, Pages = {062309}, Title = {Reducing the overhead for quantum computation when noise is biased}, Volume = {92}, Year = {2015}, local-url = {WBP15b.pdf}} @article{ADP14a, Abstract = {Steane's 7-qubit quantum error-correcting code admits a set of fault-tolerant gates that generate the Clifford group, which in itself is not universal for quantum computation. The 15-qubit Reed-Muller code also does not admit a universal fault-tolerant gate set but possesses fault-tolerant T and control-control-Z gates. Combined with the Clifford group, either of these two gates generate a universal set. Here, we combine these two features by demonstrating how to fault-tolerantly convert between these two codes, providing a new method to realize universal fault-tolerant quantum computation. One interpretation of our result is that both codes correspond to the same subsystem code in different gauges. Our scheme extends to the entire family of quantum Reed-Muller codes.}, Author = {Anderson, Jonas T. and Duclos-Cianci, Guillaume and Poulin, David}, Journal = {Phys. Rev. Lett.}, Volume = {113}, Pages = {080501}, Eprint = {arXiv:1403.2734}, Title = {Fault-tolerant conversion between the Steane and Reed-Muller quantum codes}, Year = {2014}, Local-url = {ADP14b.pdf}} @inproceedings{FP14a, Author = {Andrew Ferris and David Poulin}, Booktitle = {International Symposium on Information Theory }, Organization = {IEEE}, Title = {Branching {MERA} codes: a natural extension of classical and quantum polar codes}, Year = {2014}, local-url = {FP14a.pdf}} @article{TELEG2014, Year = {2014}, Abstract = {}, title = {Telegraphic Noise in Transport through Colloidal Quantum Dots}, author = {D. Lachance-Quirion, S. Tremblay, S. A. Lamarre, V. Méthot, D. Gingras, J. Camirand Lemyre, M. Pioro-Ladrière and C. Nì. Allen}, journal = {Nano Letters 14, 882}} @misc{DT14a, Abstract = {We propose a simple decoding algorithm for {CSS} codes taking into account the correlations between the X part and the Z part of the error. Applying this idea to surface codes, we derive an improved version of the perfect matching decoding algorithm which uses these {X/Z} correlations.}, Annote = {Comment: 10 pages}, Author = {Delfosse, Nicolas and Tillich, Jean-Pierre}, Eprint = {arXiv:1401.6975}, Title = {A decoding algorithm for {CSS} codes using the {X/Z} correlations}, Year = {2014}, Local-url = {DT14a1.pdf}} @article{FP14d, Abstract = {We establish several relations between quantum error correction ({QEC)} and tensor network ({TN)} methods of quantum many-body physics. We exhibit correspondences between well-known families of {QEC} codes and {TNs}, and demonstrate a formal equivalence between decoding a {QEC} code and contracting a {TN.} We build on this equivalence to propose a new family of quantum codes and decoding algorithms that generalize and improve upon quantum polar codes and successive cancellation decoding in a natural way.}, Author = {Ferris, Andrew J. and Poulin, David}, Journal = {Phys. Rev. Lett.}, Volume = {113}, Pages = {030501}, Eprint = {arXiv:1312.4578}, Title = {Tensor Networks and Quantum Error Correction}, Year = {2014}, local-url = {FP13a.pdf}} @article{DAMASC14, Year = {2014}, Abstract = {}, title = {Damascene Planar Metal-Insulator-Metal Tunnel Junctions}, author = {G. Droulers, S. Ecoffey, M. Guilmain, Ab. Souifi, M. Pioro-Ladriere, D. Drouin}, journal = {Nanotechnology (IEEE-NANO), 884}} @article{DP13b, Abstract = {We present a three-dimensional generalization of a renormalization group decoding algorithm for topological codes with Abelian anyonic excitations that we previously introduced for two dimensions. This 3D implementation extends our previous 2D algorithm by incorporating a failure probability of the syndrome measurements, i.e., it enables fault-tolerant decoding. We report a fault-tolerant storage threshold of 1.9(4)% for Kitaev's toric code subject to a 3D bit-flip channel (i.e. including imperfect syndrome measurements). This number is to be compared with the 2.9% value obtained via perfect matching. The 3D generalization inherits many properties of the 2D algorithm, including a complexity linear in the space-time volume of the memory, which can be parallelized to logarithmic time.}, Author = {Guillaume Duclos-Cianci and David Poulin}, Journal = {Quant. Info. and Comp.}, Volume = {14}, Pages = {0721}, Eprint = {arXiv:1304.6100}, Title = {Fault-Tolerant Renormalization Group Decoder for Abelian Topological Codes}, Year = {2014}, local-url = {DP13a1.pdf}} @article{FASTELEC14, Year = {2014}, Abstract = {}, title = {Fast Electrical Control of Single Electron Spins in Quantum Dots with Vanishing Influence from Nuclear Spins}, author = {J. Joneda, T. Otsuka, T. Nakajima, T. Takakura, T. Obata, M. Pioro-Ladrière, H. Lu, C.J. Palmstrom, A.C. Gossard and S. Tarucha}, journal = {Physical Review Letters 113, 267601}} @article{Reulet 2014 - TJ, Year = {2014}, Abstract = {}, author = {Jean-Charles Forgues, Christian Lupien and Bertrand Reulet}, title = {Emission of Microwave Photon Pairs by a Tunnel Junction}, journal = {Phys. Rev. Lett. 113, 043602 }} @article{AJO14, Year = {2014}, Abstract = {This work classifies the set of diagonal gates that can implement a single or two-qubit transversal logical gate for qubit stabilizer codes. We show that individual physical gates on the underlying qubits that compose the code are restricted to have entries of the form eic/2k along their diagonal, resulting in a similarly restricted class of logical gates that can be implemented in this manner. Moreover, we show that all diagonal logical gates that can be implemented transversally by individual physical diagonal gates must belong to the Clifford hierarchy. Furthermore, we can use this result to prove a conjecture about transversal gates made by Zeng et al. in 2007.}, title = {Classification of transversal gates in qubit stabilizer codes}, author = {Jonas T. Anderson and Tomas Jochym-O'Connor}, eprint = {arXiv:1409.8320}, local-url = {AJO14.pdf}} @article{Physics.7.45, title = {Remote Controlled Entanglement}, author = {Lalumi\`ere, Kevin and Blais, Alexandre}, journal = {Physics}, volume = {7}, pages = {45}, numpages = {1}, year = {2014}, month = {Apr}, publisher = {American Physical Society}, doi = {10.1103/Physics.7.45}, url = {http://link.aps.org/doi/10.1103/Physics.7.45}, local-url = {Remote_Controlled_Entanglement.pdf}} @article{QuantumHeatingTheo, title = {Superconducting qubit as a probe of squeezing in a nonlinear resonator}, author = {M. Boissonneault, A.C. Doherty, F.R. Ong, P. Bertet, D. Vion, D. Esteve and A. Blais}, journal = {Phys. Rev. A}, volume = {89}, issue = {2}, pages = {022324}, numpages = {11}, year = {2014}, month = {Feb}, publisher = {American Physical Society}, doi = {10.1103/PhysRevA.89.022324}, url = {http://link.aps.org/doi/10.1103/PhysRevA.89.022324}, local-url = {QuantumHeatingTheo.pdf}} @misc{DZ14a, Author = {N. Delfosse and G. Z{'e}mor}, Eprint = {arXiv:1408.4031}, Title = {A homological upper bound on the critical probability for hyperbolic percolation}, Year = {2014}, local-url = {DZ14a.pdf}} @misc{DGBR14, Year = {2014}, Abstract = {We describe a universal scheme of quantum computation by state injection on rebits (states with real density matrices). For this scheme, we establish contextuality and Wigner function negativity as computational resources, extending results of [M. Howard et al., Nature 510, 351--355 (2014)] to two-level systems. For this purpose, we define a Wigner function suited to systems of n rebits, and prove a corresponding discrete Hudson's theorem. We introduce contextuality witnesses for rebit states, and discuss the compatibility of our result with state-independent contextuality.}, title = {Wigner function negativity and contextuality in quantum computation on rebits}, author = {Nicolas Delfosse, Philippe Allard Guerin, Jacob Bian and Robert Raussendorf }, eprint = {arXiv:1409.5170}, local-url = {DGBR14.pdf}} @article{PhysRevA.89.013820, title = {Perfect squeezing by damping modulation in circuit quantum electrodynamics}, author = {Nicolas Didier, Farzad Qassemi and Alexandre Blais}, journal = {Phys. Rev. A}, volume = {89}, issue = {1}, pages = {013820}, numpages = {9}, year = {2014}, month = {Jan}, publisher = {American Physical Society}, doi = {10.1103/PhysRevA.89.013820}, url = {http://link.aps.org/doi/10.1103/PhysRevA.89.013820}, local-url = {kappa-modulation.pdf}} @article{DAMAS14, Year = {2014}, Abstract = {}, author = {P. Harvey-Collard, D. Drouin and M. Pioro-Ladrière}, title = {A Silicon Nanocrystal Tunnel Field Effect Transistor}, journal = {Applied Physics Letters 104, 93505}} @article{LONGR2014, Year = {2014}, Abstract = {}, title = {Long-Range Spin Transfer in Triple Quantum-Dots}, author = {R. Sanchez, L. Gaudreau, A. Kam, M. Pioro-Ladrière, S.A. Studenikin, P. Zawadzki and A.S. Sachrajda}, journal = {Physical Review Letters 112, 176803}} @article{PhysRevA.90.062333, title = {Multiplexed readout of transmon qubits with Josephson bifurcation amplifiers}, author = {V. Schmitt, X. Zhou, K. Juliusson, B. Royer, A. Blais, P. Bertet, D. Vion, D. Esteve,}, journal = {Phys. Rev. A}, volume = {90}, issue = {6}, pages = {062333}, numpages = {5}, year = {2014}, month = {Dec}, publisher = {American Physical Society}, doi = {10.1103/PhysRevA.90.062333}, url = {http://link.aps.org/doi/10.1103/PhysRevA.90.062333}, local-url = {SaclayJBAMultiplexed.pdf}} @article{REULET2013250404, Year = {2013}, Abstract = {}, author = {A. Bednorz, C. Bruder, B. Reulet and W. Belzig}, title = {Nonsymmetrized Correlations in Quantum Noninvasive Measurements}, journal = {Phys. Rev. Lett. 110, 250404}} @misc{F13b, Year = {2013}, Abstract = {Leveraging the decomposability of the fast Fourier-transform, I propose a new class of tensor network that is efficiently contractible and able to represent many-body systems with local entanglement that is greater than the area law. Translationally invariant systems of free fermions in arbitrary dimensions as well as 1D systems solved by the Jordan-Wigner transformation are shown to be exactly represented in this class. Further, it is proposed that these tensor networks be used as generic structures to describe more complicated systems, possibly leading to highly-efficient calculations in the Fermi-liquid phase. This class shares some similarities with Evenbly & Vidal’s branching MERA, but with some important differences and greatly reduced computational demands.}, title = {Fourier transform of fermionic systems and the spectral tensor network}, author = {A.J. Ferris}, eprint = {arXiv:1310.7605}, local-url = {F13b.pdf}} @article{Busl2013261, Abstract = {Spin qubits based on interacting spins in double quantum dots have been demonstrated successfully. Readout of the qubit state involves a conversion of spin to charge information, which is universally achieved by taking advantage of a spin blockade phenomenon resulting from Pauli's exclusion principle. The archetypal spin blockade transport signature in double quantum dots takes the form of a rectified current. At present, more complex spin qubit circuits including triple quantum dots are being developed. Here we show, both experimentally and theoretically, that in a linear triple quantum dot circuit the spin blockade becomes bipolar with current strongly suppressed in both bias directions and also that a new quantum coherent mechanism becomes relevant. In this mechanism, charge is transferred non-intuitively via coherent states from one end of the linear triple dot circuit to the other, without involving the centre site. Our results have implications for future complex nanospintronic circuits. Copyright {\copyright} 2013 Macmillan Publishers Limited. All rights reserved.}, Author = {Busl, M., Granger, G., Gaudreau, L., Sanchez, R., Kam, A., Pioro-Ladrière, M., Studenikin, S.A., Zawadzki, P., Wasilewski, Z.R., Sachrajda, A.S., and Platero, G.}, Document_Type = {Article}, Journal = {Nature Nanotechnology}, Number = {4}, Pages = {261-265}, Source = {Scopus}, Title = {Bipolar spin blockade and coherent state superpositions in a triple quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84876406548&partnerID=40&md5=dacf76e5f8cc95f36921130eac1d9231}, Volume = {8}, Year = {2013}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84876406548&partnerID=40&md5=dacf76e5f8cc95f36921130eac1d9231}} @article{NANOFAB13, Year = {2013}, Abstract = {}, title = {Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots}, author = {C. Bureau-Oxton, J. Camirand Lemyre and M. Pioro-Ladrière}, journal = {Journal of Vizualized Experiments 81, e50581}} @article{lang:2013a, Author = {C. Lang, C. Eichler, L. Steffen, J. M. Fink, M. J. Woolley, A. Blais, and A. Wallraff}, Journal = {Nat Phys}, Month = {06}, Number = {6}, Pages = {345}, Title = {Correlations, indistinguishability and entanglement in Hong-Ou-Mandel experiments at microwave frequencies}, Volume = {9}, Year = {2013}, local-url = {HOM-Exp.pdf}} @misc{BBDFP13, Abstract = {We consider two-dimensional lattice models that support Ising anyonic excitations and are coupled to a thermal bath. We propose a phenomenological model for the resulting short-time dynamics that includes pair-creation, hopping, braiding, and fusion of anyons. By explicitly constructing topological quantum error-correcting codes for this class of system, we use our thermalization model to estimate the lifetime of the quantum information stored in the encoded spaces. To decode and correct errors in these codes, we adapt several existing topological decoders to the non-Abelian setting. We perform large-scale numerical simulations of these two-dimensional Ising anyon systems and find that the thresholds of these models range between 13% to 25%. To our knowledge, these are the first numerical threshold estimates for quantum codes without explicit additive structure. }, Author = {C.G. Brell and S.D. Burton and G. Dauphinais and S.T. Flammia and D. Poulin}, Eprint = {arXiv:1311.0019}, Year = {2013}, Title = {Thermalization, Error-Correction, and Memory Lifetime for Ising Anyon Systems }, local-url = {BBDFa1.pdf}} @article{C13, Year = {2013}, Abstract = {Due to the great di±culty in scalability, quantum computers are limited in the number of qubits during the early stages of the quantum computing regime. In addition to the required qubits for storing the corresponding eigenvector, suppose we have additional k qubits available. Given such a constraint k, we propose an approach for the phase estimation for an eigenphase of exactly n-bit precision. This approach adopts the standard recursive circuit for quantum Fourier transform (QFT) in [R. Cleve and J. Watrous, Fast parallel circuits for quantum fourier transform, Proc. 41st Annual Symp. on Foundations of Computer Science (2000), pp. 526536.] and adopts classical bits to implement such a task. Our algorithm has the complexity of O(n log k), instead of O(n^2) in the conventional QFT, in terms of the total invocation of rotation gates. We also design a scheme to implement the factorization algorithm by using k available qubits via either the continued fractions approach or the simultaneous Diophantine approximation.}, author = {Chiang, Chen-Fu}, title = {Quantum phase estimation with an arbitrary number of qubits}, journal = {Int. J. Quant. Info.}, volume = {11}, pages = {1350008}, local-url = {C13.pdf}} @misc{C13b, Abstract = {We investigate the cost of three phase estimation procedures that require only constant-precision phase shift operators. The cost is in terms of the number of elementary gates, not just the number of measurements. Faster phase estimation requires the minimal number of measurements with a {\textbackslash}log * factor of reduction when the required precision n is large. The arbitrary constant-precision approach ({ACPA)} requires the minimal number of elementary gates with a minimal factor of 14 of reduction in comparison to Kitaev's approach. The reduction factor increases as the precision gets higher in {ACPA.} Kitaev's approach is with a reduction factor of 14 in comparison to the faster phase estimation in terms of elementary gate counts.}, Annote = {Comment: 12 pages}, Author = {Chiang, Chen-Fu}, Date-Added = {2013-06-13 15:13:38 +0000}, Date-Modified = {2013-06-13 15:15:05 +0000}, Eprint = {arXiv:1306.2715}, Keywords = {Quantum Physics}, Title = {Selecting Efficient Phase Estimation With Constant-Precision Phase Shift Operators}, Year = {2013}, local-url = {C13a1.pdf}} @article{CHIANG13, Year = {2013}, Abstract = {We investigate the cost of three phase estimation procedures that require only constant-precision phase shift operators. The cost is in terms of the number of elementary gates, not just the number of measurements. Faster phase estimation requires the minimal number of measurements with a logarithmic factor of reduction when the required precision n is large. The arbitrary constant-precision approach (ACPA) requires the minimal number of elementary gates with a minimal factor of 14 of reduction in comparison with Kitaev’s approach. The reduction factor increases as the precision gets higher in ACPA. Kitaev’s approach is with a reduction factor of 14 in comparison with the faster phase estimation in terms of elementary gate counts.}, title = {Selecting efficient phase estimation with constant-precision phase shift operators}, author = {Chiang, Chen-Fu}, journal = {Quantum Information Processing, Springer US, 1570-0755 / 1573-1332}} @article{KP13a, Author = {D. Kribs and D. Poulin}, Title = {Operator quantum error correction}, Editor = {D.A. Lidar and T.A. Brun}, Number = {6}, Pages = {163}, Publisher = {Cambridge University Press, Cambridge}, Journal = {Chapter in book Quantum Error Correction}, Local-url = {KP08av2.pdf}, Year = {2013}} @article{P13a, Author = {D. Poulin}, Title = {Iterative quantum coding systems}, Editor = {D.A. Lidar and T.A. Brun}, Number = {11}, Pages = {279}, Publisher = {Cambridge University Press}, Journal = {Chapter in book Quantum error correction}, Local-url = {Pou08a}, Year = {2013}} @article{PP12a, Author = {Emilie Pelchat and David Poulin}, Date-Added = {2012-04-12 08:39:46 -0400}, Date-Modified = {2013-05-29 14:36:44 +0000}, Eprint = {arXiv:1204.2439}, Journal = {IEEE Trans. Info. Theor.}, Keywords = {Error correction}, Pages = {3915}, Title = {Degenerate Viterbi decoding}, Volume = {59}, Year = {2013}, local-url = {PP13a1.pdf}} @article{ong:2013a, title = {Quantum Heating of a Nonlinear Resonator Probed by a Superconducting Qubit}, author = {F.R. Ong, M. Boissonneault, F. Mallet, A.C. Doherty, A. Blais, D. Vion, D. Esteve, P. Bertet}, journal = {Phys. Rev. Lett.}, volume = {110}, issue = {4}, pages = {047001}, numpages = {5}, year = {2013}, month = {Jan}, doi = {10.1103/PhysRevLett.110.047001}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.110.047001}, publisher = {American Physical Society}, local-url = {Quantum_heating.pdf}} @article{F13a, Author = {Ferris, Andrew J.}, Date-Added = {2013-04-11 16:11:36 -0400}, Date-Modified = {2013-04-11 16:12:10 -0400}, Journal = {Phys. Rev. B}, Month = {Mar}, Pages = {125139}, Title = {Area law and real-space renormalization}, Volume = {87}, Year = {2013}, local-url = {F13a1.pdf}} @article{FP13a, Abstract = {The Markov entropy decomposition {(MED)} is a recently-proposed, cluster-based simulation method for finite temperature quantum systems with arbitrary geometry. In this paper, we detail numerical algorithms for performing the required steps of the {MED}, principally solving a minimization problem with a preconditioned Newton's algorithm, as well as how to extract global susceptibilities and thermal responses. We demonstrate the power of the method with the spin-1/2 {XXZ} model on the {2D} square lattice, including the extraction of critical points and details of each phase. Although the method shares some qualitative similarities with exact-diagonalization, we show the {MED} is both more accurate and significantly more flexible.}, Author = {Ferris, Andrew J. and Poulin, David}, Date-Added = {2012-12-07 09:34:47 -0500}, Date-Modified = {2013-05-28 20:04:18 +0000}, Eprint = {arXiv:1212.1442}, Journal = {Phys. Rev. B}, Keywords = {Belief Propagatio; Markov entropy}, Pages = {205126}, Title = {Algorithms for the Markov Entropy Decomposition}, Urldate = {2012-12-07}, Volume = {87}, Year = {2013}, local-url = {FP13a1.pdf}} @misc{FP13c, Abstract = {We introduce a new class of circuits for constructing efficiently decodable error-correction codes, based on a recently discovered contractible tensor network. We perform an in-depth study of a particular example that can be thought of as an extension to Arikan's polar code. Notably, our numerical simulation show that this code polarizes the logical channels more strongly while retaining the log-linear decoding complexity using the successive cancellation decoder. These codes also display improved error-correcting capability with only a minor impact on decoding complexity. Efficient decoding is realized using powerful graphical calculus tools developed in the field of quantum many-body physics. In a companion paper, we generalize our construction to the quantum setting and describe more in-depth the relation between classical and quantum error correction and the graphical calculus of tensor networks.}, Author = {Ferris, Andrew J. and Poulin, David}, Date-Added = {2013-12-19 19:12:39 +0000}, Date-Modified = {2013-12-19 19:13:41 +0000}, Eprint = {arXiv:1312.4575}, Title = {Branching {MERA} codes: a natural extension of polar codes}, Year = {2013}, local-url = {FP13c1.pdf}} @article{REULET20132513, Year = {2013}, Abstract = {}, title = {Observation of Squeezing in the Electron Quantum Shot Noise of a Tunnel Junction}, author = {G. Gasse, C. Lupien and B. Reulet}, journal = {Phys. Rev. Lett. 111, 136601 }} @article{STIMUL2013, Year = {2013}, Abstract = {}, title = {Simulations of Magnetic Field Gradients due to Micro-Magnets on a Triple Quantum Dot Circuit}, author = {G. Poulin-Lamarre, C. Bureau-Oxton, A. Kam, P. Zawadzki, S. Studenikin, G. Aers, M. Pioro-Ladrière and A. S. Sachrajda}, journal = {AIP Conference Proceedings 1566, 556}} @article{Reulet2013gglscl, Year = {2013}, Abstract = {}, title = {Observation of quantum oscillations in the photoassisted shot noise of a tunnel junction}, author = {Gabriel Gasse, Lafe Spietz, Christian Lupien and Bertrand Reulet}, journal = {Phys. Rev. B 88 241402(R) }} @article{DP13a, Year = {2013}, Journal = {Phys. Rev. A}, Volume = {87}, Pages = {062338}, Abstract = {We study the quantum error correction threshold of Kitaev's toric code over the group Z_d subject to a generalized bit-flip noise. This problem requires novel decoding techniques, and for this purpose we generalize the renormalization group method we previously introduced for Z_2 topological codes.}, title = {Kitaev's Z_d-Codes Threshold Estimates}, author = {Guillaume Duclos-Cianci and David Poulin}, eprint = {arXiv:1302.3638}, local-url = {DP13c1.pdf}} @article{aREulet2013075403, Year = {2013}, Abstract = {}, title = {Shaping a time-dependent excitation to minimize shot noise in a tunnel junction}, author = {J. Gabelli and B. Reulet}, journal = {Physical Review B}, volume = {87}, pages = {075403 }} @article{REULET2013-10, Year = {2013}, Abstract = {}, author = {J.-C. Forgues, F. B. Sane, S. Blanchard, C. Lupien and B. Reulet}, title = {Noise Intensity-Intensity Correlations and the Fourth Cumulant of Photo-assisted Shot Noise}, journal = {Sci. Rep. 3, 2869 }} @article{PhysRevB.87.220505, title = {First-order sideband transitions with flux-driven asymmetric transmon qubits}, author = {J.D. Strand, M. Ware, F. Beaudoin, T.A. Ohki, B.R. Johnson, A. Blais and B.L.T. Plourde}, journal = {Phys. Rev. B}, volume = {87}, issue = {22}, pages = {220505}, numpages = {5}, year = {2013}, month = {Jun}, doi = {10.1103/PhysRevB.87.220505}, url = {http://link.aps.org/doi/10.1103/PhysRevB.87.220505}, publisher = {American Physical Society}, local-url={1stOrderSidebandExp.pdf}} @article{REUGAB2013, Year = {2013}, Abstract = {}, title = {Electron-photon correlations and the third moment of quantum noise}, author = {Julien Gabelli, Lafe Spietz, Jose Aumentado and Bertrand Reulet}, journal = {New J. Phys. 15, 113045 (2013)}} @article{lalumiere2013a, title = {Input-output theory for waveguide QED with an ensemble of inhomogeneous atoms}, author = {K. Lalumiere and B. C. Sanders, A. F. van Loo, A. Fedorov, A. Wallraff and A. Blais}, journal = {Phys. Rev. A}, volume = {88}, issue = {4}, pages = {043806}, numpages = {15}, year = {2013}, month = {Oct}, doi = {10.1103/PhysRevA.88.043806}, url = {http://link.aps.org/doi/10.1103/PhysRevA.88.043806}, publisher = {American Physical Society}, local-url = {wQED-theory.pdf}} @article{LP13a, Abstract = {We study the robustness of quantum information stored in the degenerate ground space of a local, frustration-free Hamiltonian with commuting terms on a {2D} spin lattice. On one hand, a macroscopic energy barrier separating the distinct ground states under local transformations would protect the information from thermal fluctuations. On the other hand, local topological order would shield the ground space from static perturbations. Here we demonstrate that local topological order implies a constant energy barrier, thus inhibiting thermal stability.}, Author = {Landon-Cardinal, Olivier and Poulin, David}, Eprint = {arXiv:1209.5750}, Journal = {Phys. Rev. Lett.}, Pages = {090502}, Title = {Local topological order inhibits thermal stability in {2D}}, Volume = {110}, Year = {2013}, local-url = {LP13a1.pdf}} @article{2013arXiv1304.6068W, author={MJ Woolley, C Lang, C Eichler, A Wallraff and A Blais}, title={Signatures of Hong–Ou–Mandel interference at microwave frequencies}, journal={New Journal of Physics}, volume={15}, number={10}, pages={105025}, url={http://stacks.iop.org/1367-2630/15/i=10/a=105025}, year={2013}, abstract={Two-photon quantum interference at a beam splitter, commonly known as Hong–Ou–Mandel interference, is a fundamental demonstration of the quantum mechanical nature of electromagnetic fields and a key component of various quantum information processing protocols. The phenomenon was recently demonstrated with microwave-frequency photons by Lang et al (2013 Nature Phys. 9 345–8). This experiment employed circuit QED systems as sources of microwave photons, and was based on the measurement of second-order cross-correlation and auto-correlation functions of the microwave fields at the outputs of the beam splitter using linear detectors. Here we present the calculation of these correlation functions for the cases of inputs corresponding to: (i) trains of pulsed Gaussian or Lorentzian single microwave photons and (ii) resonant fluorescent microwave fields from continuously driven circuit QED systems. In both cases, the signature of two-photon quantum interference is a suppression of the second-order cross-correlation function for small delays. The experiment described in Lang et al (2013) was performed with trains of Lorentzian single photons, and very good agreement with experimental data is obtained. The results are relevant not only to interference experiments using circuit QED systems, but any such setup with highly controllable sources and time-resolved detection.}, local-url = {HOM-theory.pdf}} @article{MajonaraDetection, title = {Detection and manipulation of Majorana fermions in circuit QED}, author = {Mueller, Clemens, Bourassa, Jérôme and Blais, Alexandre}, journal = {Phys. Rev. B}, volume = {88}, issue = {23}, pages = {235401}, numpages = {11}, year = {2013}, month = {Dec}, doi = {10.1103/PhysRevB.88.235401}, url = {http://link.aps.org/doi/10.1103/PhysRevB.88.235401}, publisher = {American Physical Society}, local-url={MajonaraDetection.pdf}} @article{INDUC, Year = {2013}, Abstract = {}, author = {P. Harvey-Collard, A. Jouad, D. Drouin and M. Pioro-Ladrière}, title = {Inductively Coupled Plasma Etching of Amorphous Silicon Nanostructures over Nanotopography using C4F8-SS6 Chemistry}, journal = {Microelectronic Engineering 100, 408}} @article{BDPS12a, Author = {S. Bravyi, G. Duclos-Cianci, D. Poulin and M. Suchara}, Eprint = {arXiv:1207.1443}, Journal = {Quant. Info. and Comp.}, Keywords = {Topological QC}, Pages = {0963}, Title = {Subsystem surface codes with three-qubit check operators}, Volume = {13}, Year = {2013}, Abstract = {We propose a simplied version of the Kitaev's surface code in which error correction requires only three-qubit parity measurements for Pauli operators XXX and ZZZ. The new code belongs to the class of subsystem stabilizer codes. It inherits many favorable properties of the standard surface code such as encoding of multiple logical qubits on a planar lattice with punctured holes, ecient decoding by either minimum-weight matching or renormalization group methods, and high error threshold. The new subsystem surface code (SSC) gives rise to an exactly solvable Hamiltonian with 3-qubit interactions, topologically ordered ground state, and a constant energy gap. We construct a local unitary transformation mapping the SSC Hamiltonian to the one of the ordinary surface code thus showing that the two Hamiltonians belong to the same topological class. We describe error correction protocols for the SSC and determine its error thresholds under several natural error models. In particular, we show that the SSC has error threshold approximately 0:6% for the standard circuit-based error model studied in the literature. We also consider a model in which three-qubit parity operators can be measured directly. We show that the SSC has error threshold approximately 0:97% in this setting.}, local-url = {BDPS12a1.pdf}} @article{Studenikin2013752, Abstract = {In this paper we describe our recent experiments on coherent manipulation of electron spin states formed in a highly tunable GaAs/AlGaAs triple quantum dot device. The coherent evolution of spin states is achieved by using fast pulses from an initialization point in the (201) charge configuration region of the stability diagram. We demonstrate the versatility of the triple dot system capable of tuning to different regimes controlled by the width of the (111) region and pulse parameters. In particular we observe Δ'1/2-Q3/2 (analogue of S-T+ in a double dot) and Δ'1/2-Δ1/2 exchange driven oscillations from both sides of the stability diagram involving all three spins. {\copyright} 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.}, Author = {Studenikin, S., Aers, G., Granger, G., Gaudreau, L., Kam, A., Zawadzki, P., Wasilewski, Z.R. and Sachrajda, A.}, Document_Type = {Article}, Journal = {Physica Status Solidi (C) Current Topics in Solid State Physics}, Number = {5}, Pages = {752-755}, Source = {Scopus}, Title = {Coherent manipulation of three-spin states in a GaAs/AlGaAs triple dot device}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84878208345&partnerID=40&md5=2c2a980d7a8f00972ca5fe9e4b583eac}, Volume = {10}, Year = {2013}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84878208345&partnerID=40&md5=2c2a980d7a8f00972ca5fe9e4b583eac}} @article{van Loo14112013, author = {van Loo, Arjan F. and Fedorov, Arkady and Lalumière, Kevin and Sanders, Barry C. and Blais, Alexandre and Wallraff, Andreas}, title = {Photon-Mediated Interactions Between Distant Artificial Atoms}, volume = {342}, number = {6165}, pages = {1494-1496}, year = {2013}, doi = {10.1126/science.1244324}, abstract ={Photon-mediated interactions between atoms are of fundamental importance in quantum optics, quantum simulations, and quantum information processing. The exchange of real and virtual photons between atoms gives rise to nontrivial interactions, the strength of which decreases rapidly with distance in three dimensions. Here, we use two superconducting qubits in an open one-dimensional transmission line to study much stronger photon-mediated interactions. Making use of the possibility to tune these qubits by more than a quarter of their transition frequency, we observe both coherent exchange interactions at an effective separation of 3λ/4 and the creation of super- and subradiant states at a separation of one photon wavelength λ. In this system, collective atom-photon interactions and applications in quantum communication may be explored.}, URL = {http://www.sciencemag.org/content/342/6165/1494.abstract}, eprint = {http://www.sciencemag.org/content/342/6165/1494.full.pdf}, journal = {Science}, local-url={wQED-Science.pdf}} @misc{BF13, Year = {2013}, Abstract = {Decoupling has become a central concept in quantum information theory with applications including proving coding theorems, randomness extraction and the study of conditions for reaching thermal equilibrium. However, our understanding of the dynamics that lead to decoupling is limited. In fact, the only families of transformations that are known to lead to decoupling are (approximate) unitary two-designs, i.e., measures over the unitary group which behave like the Haar measure as far as the first two moments are concerned. Such families include for example random quantum circuits with O(n2) gates, where n is the number of qubits in the system under consideration. In fact, all known constructions of decoupling circuits use (n2) gates. Here, we prove that random quantum circuits with O(n log2 n) gates satisfy an essentially optimal decoupling theorem. In addition, these circuits can be implemented in depth O(log3 n). This proves that decoupling can happen in a time that scales polylogarithmically in the number of particles in the system, provided all the particles are allowed to interact. Our proof does not proceed by showing that such circuits are approximate two-designs in the usual sense, but rather we directly analyze the decoupling property.}, author = {W. Brown and O. Fawzi}, title = {Decoupling with random quantum circuits}, eprint = {arXiv:1307.0632}, local-url = {BF13.pdf}} @article{2013arXiv1304.3697W, title = {Comment on ``Vacuum Rabi Splitting in a Semiconductor Circuit QED System''}, author = {Wallraff, A., Stockklauser, A., Ihn, T., Petta, J.R. and Blais, A.}, journal = {Phys. Rev. Lett.}, volume = {111}, issue = {24}, pages = {249701}, numpages = {1}, year = {2013}, month = {Dec}, doi = {10.1103/PhysRevLett.111.249701}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.111.249701}, publisher = {American Physical Society}, local-url={Toida-comment.pdf}} @misc{WLH13a, Abstract = {Known strategies for sending bits at the capacity rate over a general channel with classical input and quantum output (a cq channel) require the decoder to implement impractically complicated collective measurements. Here, we show that a fully collective strategy is not necessary in order to recover all of the information bits. In fact, when coding for a large number N uses of a cq channel W, N I(W\$0acc) of the bits can be recovered by a non-collective strategy which amounts to coherent quantum processing of the results of product measurements, where I(W\$0acc) is the accessible information of the channel W. In order to decode the other N (I(W) - I(W\$0acc)) bits, where I(W) is the Holevo rate, our conclusion is that the receiver should employ collective measurements. We also present two other results: 1) collective Fuchs-Caves measurements (quantum likelihood ratio measurements) can be used at the receiver to achieve the Holevo rate and 2) we give an explicit form of the Helstrom measurements used in small-size polar codes. The main approach used to demonstrate these results is a quantum extension of Arikan's polar codes.}, Author = {Wilde, Mark M., Landon-Cardinal, Olivier and Hayden, Patrick}, Eprint = {arXiv:1302.0398}, Title = {Towards efficient decoding of classical-quantum polar codes}, Year = {2013}, local-url = {WLH13a1.pdf}} @Article{FV12a, Year = {2012}, Abstract = {Tensor network states are powerful variational ans¨atze for many-body ground states of quantum lattice models. The use of Monte Carlo sampling techniques in tensor network approaches significantly reduces the cost of tensor contractions, potentially leading to a substantial increase in computational efficiency. Previous proposals are based on a Markov chain Monte Carlo scheme generated by locally updating configurations and, as such, must deal with equilibration and autocorrelation times, which result in a reduction of efficiency. Here we propose a perfect sampling scheme, with vanishing equilibration and autocorrelation times, for unitary tensor networks – namely tensor networks based on efficiently contractible, unitary quantum circuits, such as unitary versions of the matrix product state (MPS) and tree tensor network (TTN), and the multi-scale entanglement renormalization ansatz (MERA). Configurations are directly sampled according to their probabilities in the wavefunction, without resorting to a Markov chain process. We also describe a partial sampling scheme that can result in a dramatic (basis-dependent) reduction of sampling error.}, author = {A. Ferris and G. Vidal}, title = {Perfect Sampling with Unitary Tensor Networks}, journal = {Phys. Rev. B}, number = {85}, pages = {165146}, eprint = {arXiv:1201.3974}, local-url = {PhysRevB.85.165146.pdf}} @Article{FV12b, Year = {2012}, Abstract = {Tensor network states are powerful variational ans¨atze for ground states of quantum many-body systems on a lattice. Monte Carlo sampling techniques have been proposed as a strategy to reduce the computational cost of contractions in tensor network approaches. Here we put forward a variational Monte Carlo approach for the multi-scale entanglement renormalization ansatz (MERA), which is a unitary tensor network. Two major adjustments are required compared to previous proposals with non-unitary tensor networks. First, instead of sampling over configurations of the original lattice, made of L sites, we sample over configurations of an effective lattice, which is made of just log(L) sites. Second, the optimization of unitary tensors must account for their unitary character while being robust to statistical noise, which we accomplish with a modified steepest descent method within the set of unitary tensors. We demonstrate the performance of the variational Monte Carlo MERA approach in the relatively simple context of a finite quantum spin chain at criticality, and discuss future, more challenging applications, including two dimensional systems.}, author = {A. Ferris and G. Vidal}, title = {Variational Monte Carlo with the Multi-Scale Entanglement Renormalization Ansatz}, journal = {Phys. Rev. B}, number = {85}, pages = {165147}, eprint = {arXiv:1201.3975}, local-url = {PhysRevB.85.165147.pdf}} @article{Aers2012, Abstract = {Recent experiments with an electrostatically gated structure demonstrated coherent oscillations, involving all three spins of a linear triple dot system. In a combined experimental and theoretical study, we demonstrate coherent doublet/doublet exchange oscillations, leading to arbitrary rotation on the relevant Bloch sphere, and we reveal an interplay between exchange and hyperfine-driven "double coherent beam splitter" oscillations. {\copyright} 2012 American Physical Society.}, Art_Number = {045316}, Author = {Aers, G.C. and Studenikin, S.A. and Granger, G. and Kam, A. and Zawadzki, P. and Wasilewski, Z.R. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {4}, Source = {Scopus}, Title = {Coherent exchange and double beam splitter oscillations in a triple quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84864585924&partnerID=40&md5=152ef2f2cfe52a04314d7ee21b559436}, Volume = {86}, Year = {2012}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84864585924&partnerID=40&md5=152ef2f2cfe52a04314d7ee21b559436}} @techreport{Scaffold12, Year = {2012}, Abstract = {Supported by the Intelligence Advanced Research Projects Activity (IARPA) via Department of Interior National Business Center contract number D11PC20165. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright annotation thereon. Disclaimer: The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of IARPA, DoI/NBC, or the U.S. Government.}, author = {Ali Javadi Abhari and Arvin Faruque and Mohammad Javad Dousti and Lukas Svec and Oana Catu and Amlan Chakrabati and Chen-Fu Chiang and Seth Vanderwilt and John Black and Fred Chong and Margaret Martonosi and Martin Suchara and Ken Brown and Massoud Pedram and Todd Brun}, url = {http://www.cs.princeton.edu/research/techreps/TR-934-12}, local-url = {Scaffold12.pdf}, title = {Scaffold: Quantum Programming Language}} @article{Bogan2012, Abstract = {We have studied the effect of an in-plane magnetic field on microwave-induced resistance oscillations in a high mobility two-dimensional electron system. We have found that the oscillation amplitude decays exponentially with an in-plane component of the magnetic field B â̂¥. While these findings cannot be accounted for by existing theories, our analysis suggests that the decay can be explained by a Bâ̂¥-induced correction to the quantum scattering rate, which is quadratic in Bâ̂¥. {\copyright}2012 American Physical Society.}, Art_Number = {235305}, Author = {Bogan, A. and Hatke, A.T. and Studenikin, S.A. and Sachrajda, A. and Zudov, M.A. and Pfeiffer, L.N. and West, K.W.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {23}, Source = {Scopus}, Title = {Microwave-induced resistance oscillations in tilted magnetic fields}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84871047555&partnerID=40&md5=fb288adc78cd957b895c4a5c680d8366}, Volume = {86}, Year = {2012}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84871047555&partnerID=40&md5=fb288adc78cd957b895c4a5c680d8366}} @misc{BF12a, Abstract = {Random transformations are typically good at "scrambling" information. Specifically, in the quantum setting, scrambling usually refers to the process of mapping most initial pure product states under a unitary transformation to states which are macroscopically entangled, in the sense of being close to completely mixed on most subsystems containing a fraction fn of all n particles for some constant f. While the term scrambling is used in the context of the black hole information paradox, scrambling is related to problems involving decoupling in general, and to the question of how large isolated many-body systems reach local thermal equilibrium under their own unitary dynamics. Here, we study the speed at which various notions of scrambling/decoupling occur in a simplified but natural model of random two-particle interactions: random quantum circuits. For a circuit representing the dynamics generated by a local Hamiltonian, the depth of the circuit corresponds to time. Thus, we consider the depth of these circuits and we are typically interested in what can be done in a depth that is sublinear or even logarithmic in the size of the system. We resolve an outstanding conjecture raised in the context of the black hole information paradox with respect to the depth at which a typical quantum circuit generates an entanglement assisted encoding against the erasure channel. In addition, we prove that typical quantum circuits of poly(log n) depth satisfy a stronger notion of scrambling and can be used to encode alpha n qubits into n qubits so that up to beta n errors can be corrected, for some constants alpha, beta {\textgreater} 0.}, Author = {Brown, Winton and Fawzi, Omar}, Date-Added = {2012-10-25 13:11:32 -0400}, Date-Modified = {2012-10-25 13:12:05 -0400}, Eprint = {arXiv:1210.6644}, Keywords = {High Energy Physics - Theory, Quantum Physics}, Title = {Scrambling speed of random quantum circuits}, Year = {2012}, local-url = {BF12a1.pdf}} @misc{BP12a, Abstract = {Quantum Markov networks are a generalization of quantum Markov chains to arbitrary graphs. They provide a powerful classification of correlations in quantum many-body systems---complementing the area law at finite temperature---and are therefore useful to understand the powers and limitations of certain classes of simulation algorithms. Here, we extend the characterization of quantum Markov networks and in particular prove the equivalence of positive quantum Markov networks and Gibbs states of Hamiltonians that are the sum of local commuting terms on graphs containing no triangles. For more general graphs we demonstrate the equivalence between quantum Markov networks and Gibbs states of a class of Hamiltonians of intermediate complexity between commuting and general local Hamiltonians.}, Author = {Brown, Winton and Poulin, David}, Date-Added = {2012-06-06 10:36:53 -0400}, Date-Modified = {2012-06-06 10:37:49 -0400}, Eprint = {arXiv:1206.0755}, Title = {Quantum Markov Networks and Commuting Hamiltonians}, Year = {2012}, local-url = {BP12a1.pdf}} @article{Muller:2012, author = {C. Mueller, A. Shnirman, and M. P. Weides}, title = {T1-echo sequence: Protecting the state of a qubit in the presence of coherent interaction}, journal = {Physical Review A}, year = {2012}, volume = {86}, number = {3}, pages = {032335}, month = {sep}, doi = {10.1103/PhysRevA.86.032335}, eprint = {1207.3821}, url = {http://pra.aps.org/abstract/PRA/v86/i3/e032335}, local-url = {T1Echo.pdf}} @article{CG12a, Year = {2012}, Abstract = {The hitting time is the required minimum time for a Markov chain-based walk (classical or quantum) to reach a target state in the state space. We investigate the effect of the perturbation on the hitting time of a quantum walk. We obtain an upper bound for the perturbed quantum walk hitting time by applying Szegedy’s work and the perturbation bounds with Weyl’s perturbation theorem on classical matrix. Based on the definition of quantum hitting time given in MNRS algorithm, we further compute the delayed perturbed hitting time and delayed perturbed quantum hitting time (DPQHT). We show that the upper bound for DPQHT is bounded from above by the difference between the square root of the upper bound for a perturbed random walk and the square root of the lower bound for a random walk.}, author = {C.-F. Chiang and G. Gomez}, title = {Hitting time of quantum walks with perturbation}, journal = {Quantum Information Processing}, volume = {Feb. 9}, pages = {1}, local-url = {CG12a.pdf}} @article{CATHODO, Year = {2012}, Abstract = {}, title = {Cathodoluminescence and Photoluminescence of NV Centers}, author = {D. Roy-Guay, M. Pioro-Ladrière, D. Morris, A. Tallaire, J. Achard, D. Drouin}, journal = {International Journal of Nanoscience 11, 51240016}} @article{PhysRevA.86.022305, title = {First-order sidebands in circuit QED using qubit frequency modulation}, author = {F. Beaudoin, M. P. da Silva, Z. Dutton and A. Blais}, journal = {Phys. Rev. A}, volume = {86}, issue = {2}, pages = {022305}, numpages = {14}, year = {2012}, month = {Aug}, doi = {10.1103/PhysRevA.86.022305}, url = {http://link.aps.org/doi/10.1103/PhysRevA.86.022305}, publisher = {American Physical Society}, local-url = {FirstOrderSidebands.pdf}} @article{fedorov2012a, Annote = {10.1038/nature10713}, Author = {Fedorov, A. and Steffen, L. and Baur, M. and da Silva, M. P. and Wallraff, A.}, Date = {2012/01/12/print}, Date-Added = {2012-02-03 20:59:30 +0000}, Date-Modified = {2012-02-03 20:59:50 +0000}, Day = {12}, Isbn = {0028-0836}, Journal = {Nature}, Keywords = {Circuit QED -- Gates}, M3 = {10.1038/nature10713}, Month = {01}, Number = {7380}, Pages = {170--172}, Publisher = {Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.}, Title = {Implementation of a Toffoli gate with superconducting circuits}, Ty = {JOUR}, Url = {http://dx.doi.org/10.1038/nature10713}, Volume = {481}, Year = {2012}, Bdsk-Url-1 = {http://dx.doi.org/10.1038/nature10713}, local-url = {fedorov2012a.pdf}} @article{DBP12a, Author = {Gabrielle Denhez and Alexandre Blais and David Poulin}, Journal = {Phys. Rev. A}, Pages = {032318}, Title = {Quantum error correction benchmarks for continuous weak parity measurements}, Volume = {86}, Year = {2012}, Eprint = {arXiv:1204.3793}, local-url = {DBP12b1.pdf}} @article{Gaudreau201254, Abstract = {Spin qubits involving individual spins in single quantum dots or coupled spins in double quantum dots have emerged as potential building blocks for quantum information processing applications 1-4. It has been suggested that triple quantum dots may provide additional tools and functionalities. These include encoding information either to obtain protection from decoherence or to permit all-electrical operation, efficient spin busing across a quantum circuit 6, and to enable quantum error correction using the three-spin Greenberger-Horn-Zeilinger quantum state. Towards these goals we demonstrate coherent manipulation of two interacting three-spin states. We employ the Landau-Zener-St{\"o}ckelberg 7,8 approach for creating and manipulating coherent superpositions of quantum states. We confirm that we are able to maintain coherence when decreasing the exchange coupling of one spin with another while simultaneously increasing its coupling with the third. Such control of pairwise exchange is a requirement of most spin qubit architectures 10, but has not been previously demonstrated.}, Author = {Gaudreau, L. and Granger, G. and Kam, A. and Aers, G.C. and Studenikin, S.A. and Zawadzki, P. and Pioro-Ladri{\`e}re, M. and Wasilewski, Z.R. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Nature Physics}, Number = {1}, Pages = {54-58}, Source = {Scopus}, Title = {Coherent control of three-spin states in a triple quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84355162739&partnerID=40&md5=7f2b0b02d95d0c84782e1e8d030eb75d}, Volume = {8}, Year = {2012}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84355162739&partnerID=40&md5=7f2b0b02d95d0c84782e1e8d030eb75d}} @article{Granger2012522, Abstract = {Spin qubits have been successfully realized in electrostatically defined, lateral few-electron quantum-dot circuits. Qubit readout typically involves spin to charge information conversion, followed by a charge measurement made using a nearby biased quantum point contact (QPC). It is critical to understand the back-action disturbances resulting from such a measurement approach. Previous studies have indicated that QPC detectors emit phonons which are then absorbed by nearby qubits. We report here the observation of a pronounced back-action effect in multiple dot circuits, where the absorption of detector-generated phonons is strongly modified by a quantum interference effect, and show that the phenomenon is well described by a theory incorporating both the QPC and coherent phonon absorption. Our combined experimental and theoretical results suggest strategies to suppress back-action during the qubit readout procedure. {\copyright} 2012 Macmillan Publishers Limited. All rights reserved.}, Author = {Granger, G. and Taubert, D. and Young, C.E. and Gaudreau, L. and Kam, A. and Studenikin, S.A. and Zawadzki, P. and Harbusch, D. and Schuh, D. and Wegscheider, W. and Wasilewski, Z.R. and Clerk, A.A. and Ludwig, S. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Nature Physics}, Number = {7}, Pages = {522-527}, Source = {Scopus}, Title = {Quantum interference and phonon-mediated back-action in lateral quantum-dot circuits}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84863498035&partnerID=40&md5=ed537dbac001b7d1fa6f21a765869a04}, Volume = {8}, Year = {2012}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84863498035&partnerID=40&md5=ed537dbac001b7d1fa6f21a765869a04}} @misc{DS12a, Year = {2012}, Abstract = {An important task required to build a scalable, fault-tolerant quantum computer is to eciently represent an arbitrary single-qubit rotation by fault-tolerant quantum operations. Traditionally, the method for decomposing a single-qubit unitary into a discrete set of gates is Solovay-Kitaev decomposition, which in practice produces a sequence of depth O(logc(1=)), where c  3:97 is the state-of-the-art. The proven lower bound is c = 1, however an ecient algorithm that saturates this bound is unknown. In this paper, we present an alternative to Solovay-Kitaev decomposition employing state distillation techniques which reduces c to between 1:12 and 2:27, depending on the setting. For a given single-qubit rotation, our protocol signi cantly lowers the length of the approximating sequence and the number of required resource states (ancillary qubits). In addition, our protocol is robust to noise in the resource states.}, author = {Guillaume Duclos-Cianci and Krysta M. Svore}, title = {A State Distillation Protocol to Implement Arbitrary Single-qubit Rotations}, eprint = {arXiv:1210.1980}, local-url = {DS12a.pdf}} @article{AC12, Year = {2012}, Abstract = {While Quantum phase estimation (QPE) is at the core of many quantum algorithms known to date, its physical implementation (algorithms based on quantum Fourier trans- form (QFT) ) is highly constrained by the requirement of high-precision controlled phase shift operators, which remain dicult to realize. In this paper, we introduce an al- ternative approach to approximately implement QPE with arbitrary constant-precision controlled phase shift operators. The new quantum algorithm bridges the gap between QPE algorithms based on QFT and Kitaev's original approach. For approximating the eigenphase precise to the nth bit, Kitaev's original approach does not require any controlled phase shift operator. In contrast, QPE algorithms based on QFT or approximate QFT require controlled phase shift operators with precision of at least Pi/2n. The new approach lls the gap and requires only arbitrary constant-precision controlled phase shift operators. From a physical implementation viewpoint, the new algorithm outperforms Kitaev's approach.}, author = {H. Ahmadi and C.-F. Chiang}, journal = {Quant. Info. and Comp.}, title = {Quantum phase estimation with arbitrary constant-precision phase shift operators}, volume = {12}, pages = {0864}, local-url = {AC12.pdf}} @article{BDP11a, Abstract = {Topological phases can be defined in terms of local equivalence: two systems are in the same topological phase if it is possible to transform one into the other by a local reorganization of its degrees of freedom. The classification of topological phases therefore amounts to the classification of long-range entanglement. Such local transformation could result, for instance, from the adiabatic continuation of one system’s Hamiltonian to the other. Here, we use this definition to study the topological phase of translationally invariant stabilizer codes in two spatial dimensions, and show that they all belong to one universal phase. We do this by constructing an explicit mapping from any such code to a number of copies of Kitaev’s code. Some of our results extend to some two-dimensional (2D) subsystem codes, including topological subsystem codes. Error correction benefits from the corresponding local mappings. In particular, it enables us to use decoding algorithm developed for Kitaev’s code to decode any 2D stabilizer code and subsystem code.}, Author = {Hector Bombin and Guillaume Duclos-Cianci and David Poulin}, Eprint = {arXiv:1103.4606}, Keywords = {Topological QC}, Title = {Universal topological phase of 2D stabilizer codes}, Year = {2012}, Journal = {New J. Phys.}, Volume = {14}, Pages = {073048}, local-url = {BDP12a1.pdf}} @article{bourassa:2012a, title = {Josephson-junction-embedded transmission-line resonators: From Kerr medium to in-line transmon}, author = {J. Bourassa, F. Beaudoin, J. M. Gambetta and Blais}, journal = {Phys. Rev. A}, volume = {86}, issue = {1}, pages = {013814}, numpages = {13}, year = {2012}, month = {Jul}, doi = {10.1103/PhysRevA.86.013814}, url = {http://link.aps.org/doi/10.1103/PhysRevA.86.013814}, publisher = {American Physical Society}, local-url = {bourassa2012a.pdf}} @article{Gaudreau:2012p1724, author = {L Gaudreau and G Granger and A Kam and G C Aers and S A Studenikin and P Zawadzki and M Pioro-Ladrière and Z R Wasilewski and A S Sachrajda}, journal = {Nat Phys}, title = {Coherent control of three-spin states in a triple quantum dot}, abstract = {Nature Physics 8, 54 (2012). doi:10.1038/nphys2149}, number = {1}, pages = {54--58}, volume = {8}, year = {2012}, month = {Mar}, date-added = {2012-02-07 11:02:25 -0500}, date-modified = {2012-02-07 11:02:25 -0500}, doi = {10.1038/nphys2149}, URL = {http://dx.doi.org/10.1038/nphys2149}, local-url = {file://localhost/Users/Michel/Documents/Work/Papers/2057/Gaudreau/Nat%20Phys%202057%20Gaudreau.pdf}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p1724}, rating = {0}} @article{Boissonneault2012a, author = {Maxime Boissonneault, A. C. Doherty, F. R. Ong, P. Bertet, D. Vion, D. Esteve and A. Blais}, volume = {85}, journal = {Phys. Rev. A}, month = {Feb}, numpages = {15}, title = {Back-action of a driven nonlinear resonator on a superconducting qubit}, year = {2012}, url = {http://link.aps.org/doi/10.1103/PhysRevA.85.022305}, doi = {10.1103/PhysRevA.85.022305}, issue = {2}, publisher = {American Physical Society}, pages = {022305}, local-url = {Boissonneault2012a.pdf}} @article{PhysRevA.86.022326, title = {Improved qubit bifurcation readout in the straddling regime of circuit QED}, author = {Maxime Boissonneault, J. M. Gambetta and A. Blais}, journal = {Phys. Rev. A}, volume = {86}, issue = {2}, pages = {022326}, numpages = {9}, year = {2012}, month = {Aug}, doi = {10.1103/PhysRevA.86.022326}, url = {http://link.aps.org/doi/10.1103/PhysRevA.86.022326}, publisher = {American Physical Society}, local-url = {straddling_readout.pdf}} @article{Meng2012, Abstract = {We experimentally investigated the switching current Isw of a superconducting single electron transistor (sSET), with competitive Josephson coupling energy EJ and charging energy Ec, in an in situ tunable dissipative environment. At low temperature, averaged Isw shows a clear 1e periodic function of gate induced charge on the island. The relative contrast of this oscillation increases when EJ/Ec is lowered. Increasing dissipation reduce the quantum fluctuations of the phase across the sSET, leading to an increased Isw. {\copyright} Published under licence by IOP Publishing Ltd.}, Art_Number = {042046}, Author = {Meng, S. and Yaraskavitch, L. and Sachrajda, A.S. and Kycia, J.B.}, Document_Type = {Conference Paper}, Journal = {Journal of Physics: Conference Series}, Number = {PART 4}, Source = {Scopus}, Title = {Measuring the switching current of a superconducting single electron transistor in a tunable dissipative environment}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84873626444&partnerID=40&md5=4e9f94bd8bb06f5909497e561e020667}, Volume = {400}, Year = {2012}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84873626444&partnerID=40&md5=4e9f94bd8bb06f5909497e561e020667}} @article{LP12a, Abstract = {We describe a method for reconstructing multi-scale entangled states from a small number of efficiently-implementable measurements and fast post-processing. The method only requires singleparticle measurements and the total number of measurements is polynomial in the number of particles. Data post-processing for state reconstruction uses standard tools, namely matrix diagonalisation and conjugate gradient method, and scales polynomially with the number of particles. Our method prevents the build-up of errors from both numerical and experimental imperfections.}, Journal = {New J. Phys.}, Volume = {14}, Pages = {085004}, Author = {Olivier Landon-Cardinal and David Poulin}, Eprint = {arXiv:1204.0792}, local-url = {LP12b1.pdf}, Title = {Practical learning method for multi-scale entangled states}, Year = {2012}} @article{Anton:2012, author = {S. M. Anton, C. Mueller, J. S. Birenbaum, S. R. O'Kelley, A. D. Fefferman, D. S. Golubev, G. C. Hilton, H.-M. Cho, K. D. Irwin, F. C. Wellstood, G. Schon, A. Shnirman, and J. Clarke}, title = {Pure dephasing in flux qubits due to flux noise with spectral density scaling as {\$}1/ f^α{\$}}, journal = {Physical Review B}, year = {2012}, volume = {85}, number = {22}, pages = {224505}, month = {jun}, doi = {10.1103/PhysRevB.85.224505}, abstract = {Magnetic flux noise is a source of pure dephasing in superconducting flux qubits. Measurements on dc Superconducting QUantum Interference Devices over a range of temperatures show that the flux noise spectral density is {\$}A^2/(f/1 \hbox{Hz})^\alpha{\$}, where {\$}A{\$} is of the order of 1 {\$}\mu\Phi{\_}0 \, \hbox{Hz}^{-1/2}{\$} and {\$}0.61 \leq \alpha \leq 0.95{\$}; {\$}\Phi{\_}{0}{\$} is the flux quantum. For a qubit with an energy level splitting linearly coupled to the applied flux, calculations of the dependence of the pure dephasing time {\$}\tau{\_}\phi{\$} on {\$}\alpha{\$} for fixed {\$}A{\$} show that {\$}\tau{\_}\phi{\$} decreases rapidly as {\$}\alpha{\$} is reduced. We present numerical values of {\$}\tau{\_}\phi{\$} for the measured values of {\$}A{\$} and {\$}\alpha{\$}.}, url = {http://prb.aps.org/abstract/PRB/v85/i22/e224505}, eprint = {1111.7272}, local-url = {PureDephasing.pdf}} @article{PhysRevLett.109.153601, title = {Measurement-Induced Qubit State Mixing in Circuit QED from Up-Converted Dephasing Noise}, author = {Slichter, D. H. and Vijay, R. and Weber, S. J. and Boutin, S. and Boissonneault, M. and Gambetta, J. M. and Blais, A. and Siddiqi, I.}, journal = {Phys. Rev. Lett.}, volume = {109}, issue = {15}, pages = {153601}, numpages = {5}, year = {2012}, month = {Oct}, doi = {10.1103/PhysRevLett.109.153601}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.109.153601}, publisher = {American Physical Society}, local-url = {Dressed-dephasing-exp}} @article{Smith2012, Abstract = {Induced currents associated with the quantum Hall effect are studied in the temperature range 39mK to 1.6K, and at Landau-level filling factors ν=1,2,3,4, and 6, using torsion-balance magnetometry. A quantitative link is demonstrated between (nonlinear induced current) vs (inducing electromotive force) curves, and the subexponential decay of the induced current in a static magnetic field. The energy storage in the induced currents is reexamined with the conclusion that the predominant mechanism for storage is inductive, through the mutual inductance between the sample and the magnet, not capacitive as previous reports have assumed. The temperature dependencies of the currents are consistent with previous models, except for a low-temperature saturation at filling factors ν=1 and ν=2, which we attribute to electron heating. {\copyright} 2012 American Physical Society.}, Art_Number = {195314}, Author = {Smith, M.J. and Usher, A. and Williams, C.D.H. and Shytov, A. and Sachrajda, A.S. and Kam, A. and Wasilewski, Z.R.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {19}, Source = {Scopus}, Title = {Induced currents in the quantum Hall regime: Energy storage, persistence, and I-V characteristics}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84870512156&partnerID=40&md5=4dae2e52d4b32c3fb393f5b5f765f79d}, Volume = {86}, Year = {2012}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84870512156&partnerID=40&md5=4dae2e52d4b32c3fb393f5b5f765f79d}} @article{Studenikin2012, Abstract = {We employ an intermediate excited charge state of a lateral quantum dot device to increase the charge detection contrast during the qubit state readout procedure, allowing us to increase the visibility of coherent qubit oscillations. This approach amplifies the coherent oscillation magnitude but has no effect on the detector noise resulting in an increase in the signal to noise ratio. In this letter, we apply this scheme to demonstrate a significant enhancement of the fringe contrast of coherent Landau-Zener-St{\"u}ckelberg oscillations between singlet S and triplet T two-spin states. {\copyright} 2012 Crown.}, Art_Number = {233101}, Author = {Studenikin, S.A. and Thorgrimson, J. and Aers, G.C. and Kam, A. and Zawadzki, P. and Wasilewski, Z.R. and Bogan, A. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Applied Physics Letters}, Number = {23}, Source = {Scopus}, Title = {Enhanced charge detection of spin qubit readout via an intermediate state}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84870902032&partnerID=40&md5=1fe2375f833c2d19e64105d67a576fe2}, Volume = {101}, Year = {2012}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84870902032&partnerID=40&md5=1fe2375f833c2d19e64105d67a576fe2}} @article{Frey, author = {T. Frey, P. J. Leek, M. Beck, A. Blais, T. Ihn, J. Ensslin and A. Wallraff}, volume = {108}, journal = {Phys. Rev. Lett.}, month = {Jan}, numpages = {5}, title = {Dipole Coupling of a Double Quantum Dot to a Microwave Resonator}, year = {2012}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.108.046807}, doi = {10.1103/PhysRevLett.108.046807}, issue = {4}, publisher = {American Physical Society}, pages = {046807}, local-url = {Frey.pdf}} @article{PHOT DOUB QUAN, Year = {2012}, Abstract = {}, title = {The Photon-assisted Dynamic Nuclear Polarization Effect in a Double Quantum Dot}, author = {T. Obata, M. Pioro-Ladrière, Y. Tokura, S. Tarucha}, journal = {New Journal of Physics 14, 123013}} @ARTICLE{Lang2011, author={ C. Lang, D. Bozyigit, C. Eichler, L. Steffen, J.M. Fink, A.A. Abdumalikov, M. Baur, S. Filipp, M.P. Da Silva, A. Blais, A. Wallraff}, title={Observation of resonant photon blockade at microwave frequencies using correlation function measurements}, journal={Phys. Rev. Lett.}, year={2011}, volume={106}, number={24}, pages={243601}, document_type={Article}, local-url = {Lang2011.pdf}} @ARTICLE{Bozyigit2011, author={ D. Bozyigit, C. Lang, L. Steffen, J.M. Fink, C. Eichler, M. Baur, R. Bianchetti, P.J. Leek, S. Filipp, A. Wallraff, M.P. Da Silva, A. Blais}, title={Correlation measurements of individual microwave photons emitted from a symmetric cavity}, journal={Journal of Physics: Conference Series}, year={2011}, volume={264}, number={1}, pages={012024}, document_type={Conference Paper}, local-url = {Bozyigit2011.pdf}} @ARTICLE{Bozyigit2011154, author={ D. Bozyigit, C. Lang, L. Steffen, J.M. Fink, C. Eichler, M. Baur, R. Bianchetti, P.J. Leek, S. Filipp, M.P. Da Silva, A. Blais, A. Wallraff}, title={Antibunching of microwave-frequency photons observed in correlation measurements using linear detectors}, journal={Nature Physics}, year={2011}, volume={7}, number={2}, pages={154-158}, document_type={Article}, local-url = {Bozyigit2011154.pdf}} @ARTICLE{Ong2011, author={ F.R. Ong, M. Boissonneault, F. Mallet, A. Palacios-Laloy, A. Dewes, A.C. Doherty, A. Blais, P. Bertet, D. Vion, D. Esteve}, title={Circuit QED with a nonlinear resonator: Ac-stark shift and dephasing}, journal={Phys. Rev. Lett.}, year={2011}, volume={106}, number={16}, pages={167002}, document_type={Article}, local-url = {Ong2011.pdf}} @ARTICLE{Gambetta2011, author={ J.M. Gambetta, A.A. Houck, A. Blais}, title={Superconducting qubit with purcell protection and tunable coupling}, journal={Phys. Rev. Lett.}, year={2011}, volume={106}, number={3}, pages={030502}, document_type={Article}, local-url = {Gambetta2011.pdf}} @article{blais2011, title = {Superconductivity-based artificial atoms for quantum information}, author = {A. Blais}, year = {2011}, journal = {Physics in Canada}, pages = {123}, volume = {67}, local-url = {blais2011.pdf}} @conference{Branchaud2011837, Abstract = {An experimental study of graphene nanoconstrictions and dots has been performed. Size scales of the fluctuations within these devices are extracted from transport measurements. These sizes are found to be roughly the same size as the constrictions and dots themselves. {\copyright} 2011 American Institute of Physics.}, Author = {Branchaud, S. and Kam, A. and Zawadzki, P. and Sachrajda, A.S.}, Document_Type = {Conference Paper}, Journal = {AIP Conference Proceedings}, Pages = {837-838}, Source = {Scopus}, Title = {Towards graphene based spin qubits}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84855487113&partnerID=40&md5=c9772ecc102ae48fda317a1138b1ac77}, Volume = {1399}, Year = {2011}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84855487113&partnerID=40&md5=c9772ecc102ae48fda317a1138b1ac77}} @article{PhysRevLett.107.146801, doi = {10.1103/PhysRevLett.107.146801}, month = {Sep}, issue = {14}, author = {Brunner, R. and Shin, Y.-S. and Obata, T. and Pioro-Ladrière, M. and Kubo, T. and Yoshida, K. and Taniyama, T. and Tokura, Y. and Tarucha, S.}, year = {2011}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.107.146801}, publisher = {American Physical Society}, title = {Two-Qubit Gate of Combined Single-Spin Rotation and Interdot Spin Exchange in a Double Quantum Dot}, pages = {146801}, journal = {Phys. Rev. Lett.}, volume = {107}, numpages = {4}} @article{PQSV11a, Author = {David Poulin and Angie Quarry and Rolando D. Somma and Frank Verstraete}, Eprint = {arXiv:1102.1360}, Journal = {Phys. Rev. Lett.}, Volume = {106}, Pages = {170501}, Title = {Quantum simulation of time-dependent Hamiltonians and the convenient illusion of Hilbert space}, Local-Url = {PQSV11b1.pdf}, Year = {2011}, Abstract = {We consider the manifold of all quantum many-body states that can be generated by arbitrary time-dependent local Hamiltonians in a time that scales polynomially in the system size, and showthat it occupies an exponentially small volume in Hilbert space. This implies that the overwhelming majority of states in Hilbert space are not physical as they can only be produced after an exponentially long time. We establish this fact by making use of a time-dependent generalization of the Suzuki-Trotter expansion, followed by a well-known counting argument. This also demonstrates that a computational model based on arbitrarily}} @article{PH11a, Abstract = {We present a lower bound for the free energy of a quantum many-body system at finite temperature. This lower bound is expressed as a convex optimization problem with linear constraints, and is derived using strong subadditivity of von Neumann entropy and a relaxation of the consistency condition of local density operators. The dual to this minimization problem leads to a set of quantum belief propagation equations, thus providing a firm theoretical foundation to that approach. The minimization problem is numerically tractable, and we find good agreement with quantum Monte Carlo for the spin-1/2 Heisenberg anti-ferromagnet in two dimensions. This lower bound complements other variational upper bounds. We discuss applications to Hamiltonian complexity theory and give a generalization of the structure theorem to trees in an appendix.}, Author = {David Poulin and Matthew B. Hastings}, Eprint = {arXiv:1012.2050}, Journal = {Phys. Rev. Lett}, Pages = {080403}, Title = {Markov entropy decomposition: a variational dual for quantum belief propagation}, Volume = {106}, Year = {2011}, local-url = {PH11b1.pdf}} @article{PhysRevA.84.043832, title = {Dissipation and ultrastrong coupling in circuit QED}, month = {Oct}, doi = {10.1103/PhysRevA.84.043832}, author = {F. Beaudoin, J.M. Gambetta and A. Blais}, year = {2011}, issue = {4}, url = {http://link.aps.org/doi/10.1103/PhysRevA.84.043832}, numpages = {15}, journal = {Phys. Rev. A}, publisher = {American Physical Society}, pages = {043832}, volume = {84}, local-url = {PhysRevA.84.043832.pdf}} @article{Granger2011, Abstract = {We study the electron transport properties of gated quantum dots formed in InGaAs/InP quantum well structures grown by chemical-beam epitaxy on prepatterned substrates. Quantum dots form directly underneath narrow gates due to potential fluctuations. We measure the Coulomb-blockade diamonds in the few-electron regime of a single dot and observe photon-assisted tunneling peaks under microwave irradiation. A singlet-triplet transition at high magnetic field and Coulomb-blockade in the quantum Hall regime are also observed. {\copyright} 2011 American Institute of Physics.}, Art_Number = {132107}, Author = {Granger, G. and Studenikin, S.A. and Kam, A. and Sachrajda, A.S. and Poole, P.J.}, Document_Type = {Article}, Journal = {Applied Physics Letters}, Number = {13}, Source = {Scopus}, Title = {Few-electron quantum dots in InGaAs quantum wells: Role of fluctuations}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79953745487&partnerID=40&md5=7537c78858db0081dad16cfc63a592ec}, Volume = {98}, Year = {2011}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79953745487&partnerID=40&md5=7537c78858db0081dad16cfc63a592ec}} @article{Jeske:2011, author = {J. Jeske, J. H. Cole, C. Mueller, M. Marthaler, and G. Sch{\"o}n}, title = {Dual-probe decoherence microscopy: Probing pockets of coherence in a decohering environment}, journal = {New Journal of Physics}, year = {2011}, volume = {14}, month = {oct}, doi = {10.1088/1367-2630/14/2/023013}, abstract = {We study the use of a pair of qubits as a decoherence probe of a nontrivial environment. This dual-probe configuration is modelled by three two- level systems (TLSs), which are coupled in a chain in which the middle system represents an environmental TLS. This TLS resides within the environment of the qubits and therefore its coupling to perturbing fluctuations (i.e. its decoherence) is assumed much stronger than the decoherence acting on the probe qubits. We study the evolution of such a tripartite system including the appearance of a decoherence-free state (dark state) and non-Markovian behaviour. We find that all parameters of this TLS can be obtained from measurements of one of the probe qubits. Furthermore, we show the advantages of two qubits in probing environments and the new dynamics imposed by a TLS that couples to two qubits at once.}, eprint = {1110.1945}, url = {http://iopscience.iop.org/1367-2630/14/2/023013/}, local-url = {DualProbe.pdf}} @article{reulet2011aa, Year = {2011}, Abstract = {}, title = {Measurements of the Third Cumulant in Quantum Shot Noise at High Frequency}, author = {Julien Gabelli and Bertrand Reulet}, journal = {Proceedings of the 21st International Conference on Noise and Fluctuations (ICNF2011), IEEE Digital Library}, pages = {329-331}, address = {Toronto, Canada}} @article{TOVP11a, Year = {2011}, Abstract = {The original motivation to build a quantum computer came from Feynman, who imagined a machine capable of simulating generic quantum mechanical systems—a task that is believed to be intractable for classical computers. Such a machine could have farreaching applications in the simulation of many-body quantum physics in condensed-matter, chemical and high-energy systems. Part of Feynman’s challenge was met by Lloyd, who showed how to approximately decompose the time evolution operator of interacting quantum particles into a short sequence of elementary gates, suitable for operation on a quantum computer. However, this left open the problem of how to simulate the equilibrium and static properties of quantum systems. This requires the preparation of ground and Gibbs states on a quantum computer. For classical systems, this problem is solved by the ubiquitous Metropolis algorithm, a method that has basically acquired a monopoly on the simulation of interacting particles. Here we demonstrate how to implement a quantum version of the Metropolis algorithm. This algorithm permits sampling directly from the eigenstates of the Hamiltonian, and thus evades the sign problem present in classical simulations. A small-scale implementation of this algorithm should be achievable with today’s technology.}, author = {K. Temme and T.J. Osborne and K. Vollbrecht and David Poulin and F. Verstraete}, title = {Quantum Metropolis Sampling}, journal = {Nature}, volume = {471}, pages = {87}, month = {March}, eprint = {arXiv:0911.3635}, local-url = {TOVP11a.pdf}} @article{SLP11a, Abstract = {Quantum tomography is the main method used to assess the quality of quantum information processing devices. However, the amount of resources needed for quantum tomography is exponential in the device size. Part of the problem is that tomography generates much more information than is usually sought. Taking a more targeted approach, we develop schemes that enable (i) estimating the fidelity of an experiment to a theoretical ideal description, (ii) learning which description within a reduced subset best matches the experimental data. Both these approaches yield a significant reduction in resources compared to tomography. In particular, we demonstrate that fidelity can be estimated from a number of simple experiments that is independent of the system size, removing an important roadblock for the experimental study of larger quantum information processing units.}, Author = {Marcus P. {da Silva} and Olivier Landon-Cardinal and David Poulin}, Eprint = {arXiv:1104.3835}, Journal = {Phys. Rev. Lett.}, Pages = {210404}, Title = {Practical characterization of quantum devices without tomography}, Volume = {107}, Year = {2011}, Local-url = {dLP11a1.pdf}} @inbook{Bertet2001, Year = {2011}, Abstract = {}, author = {P. Bertet, F. R. Ong, M. Boissonneault, A. Bolduc, F. Mallet, A. Doherty, A. Blais, D. Vion and D. Esteve}, title = {Circuit quantum electrodynamics with a nonlinear resonator}, editor = {Mark Dykman}, booktitle = {Fluctuating Nonlinear Oscillators}, publisher = {Oxford University Press}, note = {To appear}, local-url = {Bertet2001.pdf}} @article{COHE CONTROL, Year = {2011}, Abstract = {}, author = {S. Tarucha, T. Obata, M. Pioro-Ladriere, R. Brunner, Y. Shin, T. Kubo, Y. Tokura}, title = {Coherent Control of Two Individual Electron Spins and Influence of Hyperfine Coupling in a Double}, journal = {Journal of Physics: Conf. Ser. 334, 012009}} @article{Smith2011, Abstract = {We report an investigation of quantum Hall induced currents by simultaneous measurements of their magnetic moment and their effect on the conductance of a quantum point contact (QPC). Correlation of features in the noise of the induced currents, caused by the breakdown of the quantum Hall effect, for the two types of measurements provides conclusive proof of the common origin of the two effects. Common features in the magnetic moment and QPC resistance at Landau-level filling factors V = 1, 2 and 4 and their similar temperature and nonlinear sweep-rate dependences support this conclusion. In contrast, there is a distinct difference in the way the induced currents decay with time when the sweeping field halts at integer filling factor as detected by the two types of measurement. We attribute this difference to the fact that, while both effects are sensitive to the magnitude of the induced current, the QPC resistance is also sensitive to the proximity of the current to the QPC split gate, and we develop a model that describes semi-quantitatively the effects we observe. Although it is clearly demonstrated that induced currents affect the electrostatics of a QPC, the reverse effect, the QPC influencing the induced current, is not observed. {\copyright} IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.}, Art_Number = {123020}, Author = {Smith, M.J. and Williams, C.D.H. and Shytov, A. and Usher, A. and Sachrajda, A.S. and Kam, A. and Wasilewski, Z.R.}, Document_Type = {Article}, Journal = {New Journal of Physics}, Source = {Scopus}, Title = {Quantum Hall induced currents and the magnetoresistance of a quantum point contact}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84855416208&partnerID=40&md5=6a3ce0d2c9dafeaf734a3ce8ce37b9ec}, Volume = {13}, Year = {2011}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84855416208&partnerID=40&md5=6a3ce0d2c9dafeaf734a3ce8ce37b9ec}} @conference{Studenikin2011607, Abstract = {We report on the observation and study of quantum transport diamonds and Zero Current Anomaly (ZCA) in the non-linear differential resistance r xx=dV xx/dI of high-mobility In xGa 1-xAs/InP structures in quantizing magnetic fields. The diamond-shaped features are observed in the grey-scale plots of r xx as a function of magnetic field and dc current. Spin diamonds are revealed at higher magnetic fields when spin levels at odd filling factors are well resolved. Unexpectedly, a narrow dip is observed in differential resistance vs. current at I dc=0 in quantizing magnetic fields, which we refer to as the ZCA effect. {\copyright} 2011 American Institute of Physics.}, Author = {Studenikin, S.A. and Granger, G. and Sachrajda, A.S. and Kam, A. and Poole, P.J.}, Document_Type = {Conference Paper}, Journal = {AIP Conference Proceedings}, Pages = {607-608}, Source = {Scopus}, Title = {Zero current anomaly in non-linear transport of high-mobility InGaAs/InP 2DEG structures in quantizing magnetic fields}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84855493545&partnerID=40&md5=48acd08d3f106d50b4275a3f9df52803}, Volume = {1399}, Year = {2011}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84855493545&partnerID=40&md5=48acd08d3f106d50b4275a3f9df52803}} @ARTICLE{Joo2010, author={ J. Joo, J. Bourassa, A. Blais, B.C. Sanders}, title={Electromagnetically induced transparency with amplification in superconducting circuits}, journal={Phys. Rev. Lett.}, year={2010}, volume={105}, number={7}, pages={073601}, document_type={Article}, local-url = {Joo2010.pdf}} @ARTICLE{Lalumiere2010, author={ K. Lalumière, J.M. Gambetta, A. Blais}, title={Tunable joint measurements in the dispersive regime of cavity QED}, journal={Phys. Rev. A}, year={2010}, volume={81}, number={4}, pages={040301}, document_type={Article}, local-url = {LALUMIERE2010.pdf}} @ARTICLE{Boissonneault2010, author={ M. Boissonneault, J.M. Gambetta, A. Blais}, title={Improved superconducting qubit readout by qubit-induced nonlinearities}, journal={Phys. Rev. Lett.}, year={2010}, volume={105}, number={10}, pages={100504}, document_type={Article}, local-url = {Boissonneault2010.pdf}} @ARTICLE{DaSilva2010, author={ M.P. Da Silva, D. Bozyigit, A. Wallraff, A. Blais}, title={Schemes for the observation of photon correlation functions in circuit QED with linear detectors}, journal={Phys. Rev. A}, year={2010}, volume={82}, number={4}, pages={043804}, document_type={Article}, local-url = {DaSilva2010.pdf}} @ARTICLE{Bianchetti2010, author={ R. Bianchetti, S. Filipp, M. Baur, J.M. Fink, C. Lang, L. Steffen, M. Boissonneault, A. Blais, A. Wallraff}, title={Control and tomography of a three level superconducting artificial atom}, journal={Phys. Rev. Lett.}, year={2010}, volume={105}, number={22}, pages={223601}, document_type={Article}, local-url = {Bianchetti2010.pdf}} @article{reulet2010aa, Year = {2010}, Abstract = {Perspectives of mesoscopic physics, dedicated to Yoseph Imry’s 70th birthday.}, title = {The Third Moment of Current Fluctuations in a Tunnel Junction: Experiments in the Classical and Quantum Regimes}, author = {B. Reulet, J. Gabelli, L. Spietz and D.E. Prober}, editor = {A. Aharony and O. Entin-Wohlman}, journal = {Perspectives of mesoscopic physics, dedicated to Yoseph Imry’s 70th birthday, edited by A. Aharony and O. Entin-Wohlman, World Scientific}} @article{Branchaud2010, Abstract = {Low-temperature magnetoconductance measurements were made in the vicinity of the charge neutrality point (CNP). Two origins for the fluctuations were identified close to the CNP. At very low magnetic fields there exist only mesoscopic magnetoconductance quantum interference features which develop rapidly as a function of density. At slightly higher fields (>0.5 T), close to the CNP, additional fluctuations track the quantum Hall (QH) sequence expected for monolayer graphene. These additional features are attributed to effects of locally charging individual QH localized states. These effects reveal a precursor to the quantum Hall effect since, unlike previous transport observations of QH dot charging effects, they occur in the absence of quantum Hall plateaus or Shubnikov-de Haas oscillations. From our transport data we are able to extract parameters that characterize the inhomogeneities in our device. {\copyright} 2010 The American Physical Society.}, Art_Number = {121406}, Author = {Branchaud, S. and Kam, A. and Zawadzki, P. and Peeters, F.M. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {12}, Source = {Scopus}, Title = {Transport detection of quantum Hall fluctuations in graphene}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77955150883&partnerID=40&md5=664a6400c41c04b8261f92178eaa7fe0}, Volume = {81}, Year = {2010}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77955150883&partnerID=40&md5=664a6400c41c04b8261f92178eaa7fe0}} @article{Cockinsa20109496, Abstract = {Strong confinement of charges in few-electron systems such as in atoms, molecules, and quantum dots leads to a spectrum of discrete energy levels often shared by several degenerate states. Because the electronic structure is key to understanding their chemical properties, methods that probe these energy levels in situ are important.We show how electrostatic force detection using atomic force microscopy reveals the electronic structure of individual and coupled self-assembled quantum dots. An electron addition spectrum results from a change in cantilever resonance frequency and dissipation when an electron tunnels on/off a dot. The spectra show clear level degeneracies in isolated quantum dots, supported by the quantitative measurement of predicted temperature-dependent shifts of Coulomb blockade peaks. Scanning the surface shows that several quantum dots may reside on what topographically appears to be just one. Relative coupling strengths can be estimated from these images of grouped coupled dots.}, Author = {Cockinsa, L. and Miyahara, Y. and Bennett, S.D. and Clerk, A.A. and Studenikin, S. and Poole, P. and Sachrajda, A. and Grutter, P.}, Document_Type = {Article}, Journal = {Proceedings of the National Academy of Sciences of the United States of America}, Number = {21}, Pages = {9496-9501}, Source = {Scopus}, Title = {Energy levels of few-electron quantum dots imaged and characterized by atomic force microscopy}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77953113208&partnerID=40&md5=efeeb5d50610ee307417f0b14d53de36}, Volume = {107}, Year = {2010}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77953113208&partnerID=40&md5=efeeb5d50610ee307417f0b14d53de36}} @article{P10a, Abstract = {The Lieb-Robinson bound shows the existence of a maximum speed of signal propagation in discrete quantum mechanical systems with local interactions. This generalizes the concept of relativistic causality beyond field theory, and provides a powerful tool in theoretical condensed matter physics and quantum information science. Here, we extend the scope of this seminal result by considering general Markovian quantum evolution, where we prove that an equivalent bound holds. In addition, we use the generalized bound to demonstrate that correlations in the stationary state of a Markov process decay on a length-scale set by the Lieb-Robinson velocity and the system's relaxation time. }, Author = {David Poulin}, Date-Added = {2010-04-22 09:52:11 -0400}, Date-Modified = {2010-05-06 13:38:06 -0400}, Journal = {Phys. Rev. Lett.}, Volume = {104}, Pages = {190401}, Local-Url = {P10a.pdf}, Title = {Lieb-Robinson bound and locality for general Markovian quantum dynamics}, Year = {2010}, Eprint = {1003.3675}} @article{BP10b, Abstract = {We continue our numerical study of quantum belief propagation initiated in cite{PB08a}. We demonstrate how the method can be expressed in terms of an effective thermal potential that materializes when the system presents quantum correlations, but is insensitive to classical correlations. The thermal potential provides an efficient means to assess the precision of belief propagation on graphs with no loops. We illustrate these concepts using the one-dimensional quantum Ising model and compare our results with exact solutions. We also use the method to study the transverse field quantum Ising spin glass for which we obtain a phase diagram that is largely in agreement with the one obtained in cite{LSS07a} using a different approach. Finally, we introduce the coarse grained belief propagation (CGBP) algorithm to improve belief propagation at low temperatures. This method combines the reliability of belief propagation at high temperatures with the ability of entanglement renormalization to efficiently describe low energy subspaces of quantum systems with local interactions. With CGBP, thermodynamic properties of quantum systems can be calculated with a high degree of accuracy at all temperatures. }, Author = {E. Bilgin and David Poulin}, Date-Added = {2009-10-13 12:36:12 -0400}, Date-Modified = {2010-05-06 13:36:54 -0400}, Eprint = {arXiv:0910.2299}, Journal = {Phys. Rev. B}, Keywords = {Simulation; Belief Propagation}, Local-Url = {BP10b.pdf}, Pages = {054106}, Title = {Coarse grained belief propagation for simulation of interacting quantum systems at all temperatures}, Volume = {81}, Year = {2010}} @article{Gaudreau2010817, Abstract = {We are pursuing a capability to perform time resolved manipulations of single spins in quantum dot circuits involving more than two quantum dots. In this paper, we demonstrate full counting statistics as well as averaging techniques used to calibrate the tunnel barriers. We make use of this to implement the Delft protocol [1] for single shot single spin readout in a device designed to form a triple quantum dot potential. We are able to tune the tunnelling times over around three orders of magnitude. We obtain a spin relaxation time of 300 μ s at 10 T. Crown Copyright {\copyright} 2009.}, Author = {Gaudreau, L. and Kam, A. and Kycia, J.B. and Studenikin, S.A. and Granger, G. and Mason, J.D. and Zawadzki, P. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {4}, Pages = {817-820}, Source = {Scopus}, Title = {Time resolved control of electron tunnelling times and single-shot spin readout in a quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-76949100921&partnerID=40&md5=6eaea12d2c7d0a0e1094b7890d1255cd}, Volume = {42}, Year = {2010}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-76949100921&partnerID=40&md5=6eaea12d2c7d0a0e1094b7890d1255cd}} @Article{PhysRevB.82.075304, title = {Three-dimensional transport diagram of a triple quantum dot}, author = {Granger, G. and Gaudreau, L. and Kam, A. and Pioro-Ladriere, M. and Studenikin, S. A. and Wasilewski, Z. R. and Zawadzki, P. and Sachrajda, A. S.}, journal = {Phys. Rev. B}, volume = {82}, number = {7}, pages = {075304}, numpages = {5}, year = {2010}, month = {Aug}, doi = {10.1103/PhysRevB.82.075304}, publisher = {American Physical Society}} @article{Granger2010, Abstract = {We measure a triple quantum dot in the regime where three addition lines, corresponding to the addition of an electron to each of three dots, pass through each other. In particular, we probe the interplay between transport and the three-dimensional nature of the stability diagram. We choose the regime most pertinent for spin qubit applications. We find that at low bias transport through the triple quantum dot circuit is only possible at six quadruple point locations. The results are consistent with an equivalent circuit model. {\copyright} 2010 The American Physical Society.}, Art_Number = {075304}, Author = {Granger, G. and Gaudreau, L. and Kam, A. and Pioro-Ladri{\`e}re, M. and Studenikin, S.A. and Wasilewski, Z.R. and Zawadzki, P. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {7}, Source = {Scopus}, Title = {Three-dimensional transport diagram of a triple quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77957577844&partnerID=40&md5=10593be2b38829b72c0c9e8acd480ffc}, Volume = {82}, Year = {2010}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77957577844&partnerID=40&md5=10593be2b38829b72c0c9e8acd480ffc}} @article{Granger20102622, Abstract = {The purpose of this work is to fabricate ribbon-like InGaAs and InAsP wires embedded in InP ridge structures and investigate their transport properties. The InP ridge structures that contain the wires are selectively grown by chemical beam epitaxy (CBE) on pre-patterned InP substrates. To optimize the growth and micro-fabrication processes for electronic transport, we explore the Ohmic contact resistance, the electron density, and the mobility as a function of the wire width using standard transport and Shubnikovde Haas measurements. At low temperatures the ridge structures reveal reproducible mesoscopic conductance fluctuations. We also fabricate ridge structures with submicron gate electrodes that exhibit non-leaky gating and good pinch-off characteristics acceptable for device operation. Using such wrap gate electrodes, we demonstrate that the wires can be split to form quantum dots evidenced by Coulomb blockade oscillations in transport measurements. {\copyright} 2009 Elsevier B.V. All rights reserved.}, Author = {Granger, G. and Kam, A. and Studenikin, S.A. and Sachrajda, A.S. and Aers, G.C. and Williams, R.L. and Poole, P.J.}, Document_Type = {Conference Paper}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {10}, Pages = {2622-2627}, Source = {Scopus}, Title = {Electron transport in gated InGaAs and InAsP quantum well wires in selectively grown InP ridge structures}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77957990662&partnerID=40&md5=63871693c3f2e9e05c463b0c62ddedea}, Volume = {42}, Year = {2010}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77957990662&partnerID=40&md5=63871693c3f2e9e05c463b0c62ddedea}} @article{DP10a, Abstract = {We present a family of algorithms, combining real-space renormalization methods and belief propagation, to estimate the free energy of a topologically ordered system in the presence of defects. Such an algorithm is needed to preserve the quantum information stored in the ground space of a topologically ordered system and to decode topological error-correcting codes. For a system of linear size $ell$, our algorithm runs in time $logell$ compared to $ell^6$ needed for the minimum-weight perfect matching algorithm previously used in this context and achieves a higher depolarizing error threshold.}, Author = {Guillaume Duclos-Cianci and David Poulin}, Date-Added = {2009-11-09 09:11:43 -0500}, Date-Modified = {2010-05-06 13:37:27 -0400}, Eprint = {arXiv:0911.0581}, Journal = {Phys. Rev. Lett.}, Keywords = {Topological QC; Error correction}, Local-Url = {DP10a.pdf}, Pages = {050504}, Title = {Fast decoders for topological quantum codes}, Volume = {104}, Year = {2010}} @inproceedings{DP10a1, Year = {2010}, Abstract = {Topological quantum error-correcting codes are defined by geometrically local checks on a two-dimensional lattice of quantum bits (qubits), making them particularly well suited for fault-tolerant quantum information processing. Here, we present a decoding algorithm for topological codes that is faster than previously known algorithms and applies to a wider class of topological codes. Our algorithm makes use of two methods inspired from statistical physics: renormalization groups and mean-field approximations. First, the topological code is approximated by a concatenated block code that can be efficiently decoded. To improve this approximation, additional consistency conditions are imposed between the blocks, and are solved by a belief propagation algorithm.}, title = {A renormalization group decoding algorithm for topological quantum codes}, booktitle = {IEEE Information Theory Workshop}, author = {Guillaume Duclos-Cianci and David Poulin}, eprint = {arXiv:1006.1362}, local-url = {DP10a1.pdf}} @article{CPFS10a, Author = {M. Cramer and M.B. Plenio and S.T. Flammia and R. Somma and D. Gross and S.D. Bartlett and O. Landon-Cardinal and D. Poulin and Y.-K. Liu}, Journal = {Nature Comm.}, Pages = {149}, Title = {Efficient quantum state tomography}, Volume = {1}, Year = {2010}, Eprint = {1101.4366}, Abstract = {Quantum state tomography—deducing quantum states from measured data—is the gold standard for verification and benchmarking of quantum devices. It has been realized in systems with few components, but for larger systems it becomes unfeasible because the number of measurements and the amount of computation required to process them grows exponentially in the system size. Here, we present two tomography schemes that scale much more favourably than direct tomography with system size. One of them requires unitary operations on a constant number of subsystems, whereas the other requires only local measurements together with more elaborate post-processing. Both rely only on a linear number of experimental operations and post-processing that is polynomial in the system size. These schemes can be applied to a wide range of quantum states, in particular those that are well approximated by matrix product states. The accuracy of the reconstructed states can be rigorously certified without any a priori assumptions.}, Local-Url = {CPFS10a1.pdf}} @article{Mason2010813, Abstract = {In this paper, we give details related to the implementation of a rf-QPC charge detector coupled to a GaAs/AlGaAs triple dot. Each component of the readout circuit is discussed with emphasis on the isolator. We use a 10 K noise temperature HEMT amplifier in the readout and determine that the attenuation of amplifier noise that the isolator provides is not significant. A base electron temperature of 100 mK is reached independent of the existence of the isolator in the readout circuit. We also discuss the use of normal metal and superconducting resonant circuits. Using the superconducting resonant circuit, we detect charge motion in the device and determine that the bandwidth of the readout is at least 1 MHz with a sensitivity of 1.46 × 10 - 4 e / sqrt(Hz). {\copyright} 2009 Elsevier B.V.}, Author = {Mason, J.D. and Gaudreau, L. and Studenikin, S.A. and Kam, A. and Djurkovic, B. and Sachrajda, A.S. and Kycia, J.B.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {4}, Pages = {813-816}, Source = {Scopus}, Title = {A high speed radio-frequency quantum point contact charge detector for time resolved readout applications of spin qubits}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-76949086444&partnerID=40&md5=5f1ea860c41d74d31ec4cd922114694c}, Volume = {42}, Year = {2010}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-76949086444&partnerID=40&md5=5f1ea860c41d74d31ec4cd922114694c}} @article{BNPV10a, Author = {R. Blume-Kohout and H.K. Ng and D. Poulin and L. Viola}, Date-Added = {2010-03-16 13:15:33 -0400}, Date-Modified = {2010-12-09 14:07:09 -0500}, Eprint = {arXiv:1006.1358}, Journal = {Phys. Rev. A}, Pages = {062306}, Title = {Information preserving structures: a general framework for quantum zero-error information}, Volume = {82}, Year = {2010}, Local-Url = {BNPV10b1.pdf}, Abstract = {Quantum systems carry information. Quantum theory supports at least two distinct kinds of information (classical and quantum), and a variety of different ways to encode and preserve information in physical systems. A system's ability to carry information is constrained and defined by the noise in its dynamics. This paper introduces an operational framework, using informationpreserving structures to classify all the kinds of information that can be perfectly (i.e., with zero error) preserved by quantum dynamics. We prove that every perfectly preserved code has the same structure as a matrix algebra, and that preserved information can always be corrected. We also classify distinct operational criteria for preservation (e.g., ``noiseless'', ``unitarily correctible'', etc.) and introduce two new and natural criteria for measurement-stabilized and unconditionally preserved codes. Finally, for several of these operational critera, we present efficient [polynomial in the state-space dimension] algorithms to find all of a channel's information-preserving structures.}} @inproceedings{BPT10b, Author = {S. Bravyi and D. Poulin and B.M. Terhal}, Booktitle = {Quantum Cryptography and Computing}, Editor = {R. Horodecki and S. Ya. Kilin and J. Kowalik}, Pages = {125}, Title = {Tradeoffs for reliable quantum information storage in 2D systems}, Year = {2010}, local-url = {BPT10a.pdf}} @article{BPT10a, Abstract = {We ask whether there are fundamental limits on storing quantum information reliably in a bounded volume of space. To investigate this question, we study quantum error correcting codes specified by geometrically local commuting constraints on a 2D lattice of finite-dimensional quantum particles. For these 2D systems, we derive a tradeoff between the number of encoded qubits $k$, the distance of the code $d$, and the number of particles $n$. It is shown that $kd^2=O(n)$ where the coefficient in $O(n)$ depends only on the locality of the constraints and dimension of the Hilbert spaces describing individual particles. The analogous tradeoff for the classical information storage is $ksqrt{d} =O(n)$.}, Author = {S. Bravyi and David Poulin and B.M. Terhal}, Date-Added = {2009-10-01 08:43:00 -0400}, Date-Modified = {2010-05-06 13:35:38 -0400}, Eprint = {arXiv:0909.5200}, Journal = {Phys. Rev. Lett.}, Keywords = {Error correction, Self correcting}, Local-Url = {BPT10b.pdf}, Pages = {050503}, Title = {Tradeoffs for reliable quantum information storage in {2D} systems}, Volume = {104}, Year = {2010}} @article{Santavicca2010, author = {Santavicca, D.F., Reulet, B., Karasik, B.S., Pereverzev, S.V., Olaya, D., Gershenson, M.E., Frunzio, L. , Prober, D.E.}, title = {Energy resolution of terahertz single-photon-sensitive bolometric detectors}, journal = {Applied Physics Letters}, year = {2010}, volume = {96, 083505, also in Virtual Journal of Applications of Superconductivity}, number = {8}, art_number = {083505}, abstract = {We report measurements of the energy resolution of ultrasensitive superconducting bolometric detectors. The device is a superconducting titanium nanobridge with niobium contacts. A fast microwave pulse is used to simulate a single higher-frequency photon, where the absorbed energy of the pulse is equal to the photon energy. This technique allows precise calibration of the input coupling and avoids problems with unwanted background photons. Present devices have an intrinsic full-width at half-maximum energy resolution of approximately 23 THz, near the predicted value due to intrinsic thermal fluctuation noise. 2010 American Institute of Physics.}, document_type = {Article}} @journal article{10.1063/1.3518919, title = {Triple quantum dot device designed for three spin qubits}, publisher = {AIP}, journal = {App Phys Lett}, year = {2010}, doi = {DOI:10.1063/1.3518919}, issn = {00036951}, eissn = {10773118}, coden = {APPLAB}, volume = {97}, number = {21}, pages = {212104}, author = {T. Takakura and M. Pioro-Ladrière and T. Obata and Y.-S. Shin and R. Brunner and K. Yoshida and T. Taniyama and S. Tarucha}, keywords = {micromagnetics; numerical analysis; paramagnetic resonance; quantum computing; quantum dots; }, url = {http://dx.doi.org/doi/10.1063/1.3518919}} @Article{Obata:2010p701, author = {Toshiaki Obata and Michel Pioro-Ladriere and Yasuhiro Tokura and Yun-Sok Shin and Toshihiro Kubo and Katsuharu Yoshida and Tomoyasu Taniyama and Seigo Tarucha}, journal = {Phys Rev B}, title = {Coherent manipulation of individual electron spin in a double quantum dot integrated with a micromagnet}, abstract = {We report the coherent manipulation of electron spins in a double quantum dot integrated with a micromagnet. We performed electric dipole spin resonance experiments in the continuous wave (CW) and pump-and-pobe modes. We observed two resonant CW peaks and two Rabi oscillations of the quantum dot current by sweeping an external magnetic field at a fixed frequency. Two peaks and oscillations are measured at different resonant magnetic field, which reflects the fact that the local magnetic fields at each quantum dot are modulated by the stray field of a micromagnet. As predicted with a density matrix approach, the CW current is quadratic with respect to microwave (MW) voltage while the Rabi frequency (nu(Rabi)) is linear. The difference between the nu(Rabi) values of two Rabi oscillations directly reflects the MW electric field across the two dots. These results show that the spins on each dot can be manipulated coherently at will by tuning the micromagnet alignment and MW electric field.}, affiliation = {JST, ICORP, Quantum Spin Informat Project, Atsugi, Kanagawa 2430198, Japan}, number = {8}, pages = {085317}, volume = {81}, year = {2010}, month = {Jan}, language = {English}, keywords = {Resonance, Fields}, date-added = {2010-05-14 10:35:46 -0400}, date-modified = {2010-05-14 10:35:46 -0400}, doi = {10.1103/PhysRevB.81.085317}, pmid = {000275053300084}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p701}, rating = {0}} @Article{Shin:2010p696, author = {Yun-Sok Shin and Toshiaki Obata and Yasuhiro Tokura and Michel Pioro-Ladriere and Roland Brunner and Toshihiro Kubo and Katsuharu Yoshida and Seigo Tarucha}, journal = {Phys Rev Lett}, title = {Single-Spin Readout in a Double Quantum Dot Including a Micromagnet}, abstract = {We use photon-assisted tunneling (PAT) and an inhomogeneous Zeeman field to demonstrate spin-selective PAT readout with a double quantum dot. The inhomogeneous Zeeman field is generated by a proximal micromagnet, which provides different stray fields between the two dots, resulting in an energy difference between the interdot PAT of the up-spin state and that of the down-spin state. We apply various external magnetic fields to modify the relative filling weight between the up-spin and down-spin states and detect it by using a charge detection technique to probe the PAT induced charge delocalization in the double dot.}, affiliation = {JST, ICORP, Quantum Spin Informat Project, Atsugi, Kanagawa 2430198, Japan}, number = {4}, pages = {046802}, volume = {104}, year = {2010}, month = {Jan}, language = {English}, keywords = {Electron-Spin, Fields}, date-added = {2010-05-14 10:35:56 -0400}, date-modified = {2010-05-14 10:35:56 -0400}, doi = {10.1103/PhysRevLett.104.046802}, pmid = {000274336600039}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p696}, rating = {0} } @ARTICLE{Hutchison2009225, author={ C.L. Hutchison, J.M. Gambetta, A. Blais, F.K. Wilhelm}, title={Quantum trajectory equation for multiple qubits in circuit QED: Generating entanglement by measurement}, journal={Canadian Journal of Physics}, year={2009}, volume={87}, number={3}, pages={225-231}, document_type={Conference Paper}, local-url = {Hutchison2009225.pdf}} @ARTICLE{Bourassa2009, author={ J. Bourassa, J.M. Gambetta, A.A. Abdumalikov, O. Astafiev, Y. Nakamura, A. Blais}, title={Ultrastrong coupling regime of cavity QED with phase-biased flux qubits}, journal={Phys. Rev. A}, year={2009}, volume={80}, number={3}, pages={032109}, document_type={Article}, local-url = {Bourassa2009.pdf}} @CONFERENCE{Fink2009, author={ J.M. Fink, M. Baur, R. Bianchetti, S. Filipp, M. Göppl, P.J. Leek, L. Steffen, A. Blais, A. Wallraff}, title={Thermal excitation of multi-photon dressed states in circuit quantum electrodynamics}, journal={Physica Scripta T}, year={2009}, volume={T137}, pages={014013}, document_type={Conference Paper}, local-url = {Fink2009.pdf}} @ARTICLE{Dicarlo2009240, author={ L. Dicarlo, J.M. Chow, J.M. Gambetta, L.S. Bishop, B.R. Johnson, D.I. Schuster, J. Majer, A. Blais, L. Frunzio, S.M. Girvin, R.J. Schoelkopf}, title={Demonstration of two-qubit algorithms with a superconducting quantum processor}, journal={Nature}, year={2009}, volume={460}, number={7252}, pages={240-244}, document_type={Article}, local-url = {Dicarlo2009240.pdf}} @ARTICLE{Baur2009, author={ M. Baur, S. Filipp, R. Bianchetti, J.M. Fink, M. Göppl, L. Steffen, P.J. Leek, A. Blais, A. Wallraff}, title={Measurement of autler-townes and mollow transitions in a strongly driven superconducting qubit}, journal={Phys. Rev. Lett.}, year={2009}, volume={102}, number={24}, pages={243602}, document_type={Article}, local-url = {Baur2009.pdf}} @ARTICLE{Boissonneault2009, author={ M. Boissonneault, J.M. Gambetta, A. Blais}, title={Dispersive regime of circuit QED: Photon-dependent qubit dephasing and relaxation rates}, journal={Phys. Rev. A}, year={2009}, volume={79}, number={1}, pages={013819}, document_type={Article}, local-url = {Boissonneault2009.pdf}} @ARTICLE{Bianchetti2009, author={ R. Bianchetti, S. Filipp, M. Baur, J.M. Fink, M. Göppl, P.J. Leek, L. Steffen, A. Blais, A. Wallraff}, title={Dynamics of dispersive single-qubit readout in circuit quantum electrodynamics}, journal={Phys. Rev. A}, year={2009}, volume={80}, number={4}, pages={043840}, document_type={Article}, local-url = {Bianchetti2009.pdf}} @ARTICLE{Filipp2009, author={ S. Filipp, P. Maurer, P.J. Leek, M. Baur, R. Bianchetti, J.M. Fink, M. Göppl, L. Steffen, J.M. Gambetta, A. Blais, A. Wallraff}, title={Two-qubit state tomography using a joint dispersive readout}, journal={Phys. Rev. Lett.}, year={2009}, volume={102}, number={20}, pages={200402}, document_type={Article}, local-url = {Filipp2009.pdf}} @ARTICLE{Chiodi2009, author = {Chiodi, F., Aprili, M., Reulet, B.}, title = {Evidence for two time scales in long SNS junctions}, journal = {Physical Review Letters}, year = {2009}, volume = {103, 177002}, number = {17}, art_number = {177002}, note = {cited By (since 1996) 0}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-70350430173&partnerID = 40&md5 = 92279497e0f8907c1072af25752dc418}, affiliation = {Laboratoire de Physique des Solides, UMR8502, Université, Paris-Sud, Bâtiment 510, 91405 ORSAY Cedex, France}, abstract = {We use microwave excitation to elucidate the dynamics of long superconductor-normal metal-superconductor Josephson junctions. By varying the excitation frequency in the range 10 MHz-40 GHz, we observe that the critical and retrapping currents, deduced from the dc voltage versus dc current characteristics of the junction, are set by two different time scales. The critical current increases when the ac frequency is larger than the inverse diffusion time in the normal metal, whereas the retrapping current is strongly modified when the excitation frequency is above the electron-phonon rate in the normal metal. Therefore the critical and retrapping currents are associated with elastic and inelastic scattering, respectively. 2009 The American Physical Society.}, document_type = {Article}, source = {Scopus}} @article{PTO09a, Abstract = {We present a theory of quantum serial turbo-codes, describe their iterative decoding algorithm, and study their performances numerically on a depolarization channel. Our construction offers several advantages over quantum LDPC codes. First, the Tanner graph used for decoding is free of 4-cycles that deteriorate the performances of iterative decoding. Secondly, the iterative decoder makes explicit use of the code's degeneracy. Finally, there is complete freedom in the code design in terms of length, rate, memory size, and interleaver choice. We define a quantum analogue of a state diagram that provides an efficient way to verify the properties of a quantum convolutional code, and in particular its recursiveness and the presence of catastrophic error propagation. We prove that all recursive quantum convolutional encoder have catastrophic error propagation. In our constructions, the convolutional codes have thus been chosen to be non-catastrophic and non-recursive. While the resulting families of turbo-codes have bounded minimum distance, from a pragmatic point of view the effective minimum distances of the codes that we have simulated are large enough not to degrade the iterative decoding performance up to reasonable word error rates and block sizes. With well chosen constituent convolutional codes, we observe an important reduction of the word error rate as the code length increases. }, Author = {D. Poulin and J.-P. Tillich and H. Ollivier}, Date-Added = {2007-07-09 10:08:12 -0700}, Date-Modified = {2010-05-06 13:38:55 -0400}, Eprint = {arXiv:0712.2888}, Journal = {IEEE Trans. Info. Theor.}, Keywords = {Turbo Codes; Error correction}, Local-Url = {PTO09b.pdf}, Number = {6}, Pages = {2776}, Title = {Quantum serial turbo-codes}, Volume = {55}, Year = {2009}} @article{PW09b, Abstract = {We present a quantum algorithm to prepare the thermal Gibbs state of interacting quantum systems. This algorithm sets a universal upper bound $D^\alpha$ on the thermalization time of a quantum system, where $D$ is the system's Hilbert space dimension and $\alpha \leq \frac 12$ is proportional to the Helmholtz free energy density of the system. We also derive an algorithm to evaluate the partition function of a quantum system in a time proportional to the system's thermalization time and inversely proportional to the targeted accuracy squared. }, Author = {David Poulin and Pawel Wocjan}, Date-Added = {2009-06-05 14:51:04 -0400}, Date-Modified = {2010-05-06 13:40:25 -0400}, Eprint = {arXiv:0905.2199}, Journal = {Phys. Rev. Lett.}, Local-Url = {PW09e.pdf}, Pages = {220502}, Title = {Sampling from the quantum Gibbs state and evaluating partition functions with a quantum computer}, Volume = {103}, Year = {2009}} @article{PW09a, Abstract = {Preparing the ground state of a system of interacting classical particles is an NP-hard problem. Thus, there is in general no better algorithm to solve this problem than exhaustively going through all $N$ configurations of the system to determine the one with lowest energy, requiring a running time proportional to $N$. A quantum computer, if it could be built, could solve this problem in time $\sqrt N$. Here, we present a powerful extension of this result to the case of interacting {\em quantum} particles, demonstrating that a quantum computer can prepare the ground state of a quantum system as efficiently as it does for classical systems. }, Author = {David Poulin and Pawel Wocjan}, Date-Added = {2008-09-16 10:33:27 -0400}, Date-Modified = {2010-05-06 13:39:48 -0400}, Eprint = {arXiv:0809.2705}, Journal = {Phys. Rev. Lett.}, Keywords = {Complexity; Quantum simulation}, Local-Url = {PW09b.pdf}, Pages = {130503}, Title = {Preparing ground states of quantum many-body systems on a quantum computer}, Volume = {102}, Year = {2009}} @ARTICLE{Gabelli2009, author = {Gabelli, J., Reulet, B.}, title = {Full counting statistics of avalanche transport: An experiment}, journal = {Physical Review B - Condensed Matter and Materials Physics}, year = {2009}, volume = {80,161203(R)}, number = {16}, art_number = {161203}, note = {cited By (since 1996) 0}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-72649089034&partnerID = 40&md5 = 61dd8202cf48e63914f61143a9d94efe}, affiliation = {Laboratoire de Physique des Solides, UMR 8502, Bĝtiment 510, 91405 Orsay Cedex, France}, abstract = {We report the measurement of higher order cumulants of the current fluctuations in an avalanche diode with a stationary dc current. Such a system is archetypal of devices in which transport is governed by a collective mechanism, in this case charge multiplication by avalanche. We have measured the first five cumulants of the probability distribution of the current fluctuations. We show that the charge multiplication factor is distributed according to a power law that is different from that of the usual avalanche below breakdown, when avalanches are well separated. 2009 The American Physical Society.}, document_type = {Article}, source = {Scopus}} @article{Gaudreau2009, Abstract = {In this paper, we report on a tunable few electron lateral triple quantum dot design. The quantum dot potentials are arranged in series. The device is aimed at studies of triple quantum dot properties where knowing the exact number of electrons is important as well as quantum information applications involving electron spin qubits. We demonstrate tuning strategies for achieving required resonant conditions such as quadruple points where all three quantum dots are on resonance. We find that in such a device resonant conditions at specific configurations are accompanied by complex charge transfer behavior. {\copyright} 2009 American Institute of Physics.}, Art_Number = {193101}, Author = {Gaudreau, L. and Kam, A. and Granger, G. and Studenikin, S.A. and Zawadzki, P. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Applied Physics Letters}, Number = {19}, Source = {Scopus}, Title = {A tunable few electron triple quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-70449698317&partnerID=40&md5=bf2c8fa114172b54609f269265fec5f2}, Volume = {95}, Year = {2009}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-70449698317&partnerID=40&md5=bf2c8fa114172b54609f269265fec5f2}} @conference{Gaudreau2009273, Abstract = {Magnetotransport measurements have been performed on a triple quantum ring structure at four specific locations (two quadruple points and two triple points) in the stability diagram. Surprisingly the experimental results indicate similar properties at all four points. Fourier transform analysis of the magnetoconductance data reveal several dominant and related periods. Theoretical calculations suggest that with improved resolution future experiments should reveal configuration specific magnetoconductance results in the few electron regime. {\copyright} 2009 American Institute of Physics.}, Author = {Gaudreau, L. and Sachrajda, A.S. and Studenikin, S. and Kam, A. and Delgado, F. and Shim, Y.P. and Korkusinski, M. and Hawrylak, P.}, Document_Type = {Conference Paper}, Journal = {AIP Conference Proceedings}, Pages = {273-274}, Source = {Scopus}, Title = {Coherent transport through three few electron quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-74849134481&partnerID=40&md5=2b28724ad17009f0575176e666e27b8b}, Volume = {1199}, Year = {2009}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-74849134481&partnerID=40&md5=2b28724ad17009f0575176e666e27b8b}} @article{REulet200901049, Year = {2009}, Abstract = {}, title = {High frequency Dynamics and Third Cumulant of Quantum Noise}, author = {J. Gabelli and B. Reulet}, journal = {J. Stat. Mech}, pages = {P01049}} @article{Fink2009b, title = {Dressed Collective Qubit States and the Tavis-Cummings Model in Circuit QED}, author = {J. M. Fink, R. Bianchetti, M. Baur, M. Goeppl, L. Steffen, S. Filipp, P. J. Leek, A. Blais and A. Wallraff}, year = {2009}, journal = {Phys. Rev. Lett.}, pages = {083601}, volume = {103}, local-url = {Fink2009b.pdf}} @CONFERENCE{Santavicca200972, author = {Santavicca, D.F. , Reulet, B. , Karasik, B.S. , Pereverzev, S.V. , Olaya, D. , Gershenson, M.E. , Frunzio, L. , Prober, D.E. }, title = {Characterization of terahertz single-photon-sensitive bolometric detectors using a pulsed microwave technique}, journal = {AIP Conference Proceedings}, year = {2009}, volume = {1185}, pages = {72-75}, note = {cited By (since 1996) 0}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-74349093442&partnerID = 40&md5 = a0487ce508f9a578d762fafa68db2eab}, affiliation = {Departments of Applied Physics and Physics, Yale University, New Haven, CT 06520-8284, United States; Laboratoire de Physique des Solides, Universite Paris-Sud, 91405 Orsay, France; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States; Department of Physics, Rutgers University, Piscataway, NJ 08854, United States}, abstract = {We describe a technique for characterizing bolometric detectors that have sufficient sensitivity to count single terahertz photons. The device is isolated from infrared blackbody radiation and a single terahertz photon is simulated by a fast microwave pulse, where the absorbed energy of the pulse is equal to the photon energy. We have employed this technique to characterize bolometric detectors consisting of a superconducting titanium nanobridge with niobium contacts. Present devices have Tc, = 0.3 K and a measured intrinsic energy resolution of approximately 6 terahertz fullwidth at half-maximum, near the predicted value due to intrinsic thermal fluctuation noise, with a time constant of 2μis. An intrinsic energy resolution of 1 terahertz should be achievable by reducing the volume of the titanium nanobridge. Such a detector has important applications in future space-based terahertz astronomy missions. 2009 American Institute of Physics.}, author_keywords = {Calorimeter; Energy resolution; Single-photon detector; Superconducting bolometer; Terahertz}, document_type = {Conference Paper}, source = {Scopus}} @article{Shim2009736, Abstract = {We present a theory of electronic and transport properties of triple quantum dot molecules in the vicinity of quadruple points where four different charge configurations are on resonance. We study three different quadruple points in the presence of a magnetic field and show that a trapped particle in one of the dot plays an essential role in determining the spin character of the transport. Many-electron states of the triple quantum dot molecules are used as transport channels in the Fermi's Golden Rule approach and it is demonstrated that the Aharonov-Bohm oscillations of the energy spectrum lead to spin-selective oscillations in transport. {\copyright} 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.}, Author = {Shim, Y.-P. and Delgado, F. and Korkusinski, M. and Gaudreau, L. and Studenikin, S. and Kam, A. and Sachrajda, A.S. and Hawrylak, P.}, Document_Type = {Article}, Journal = {Physica Status Solidi (B) Basic Research}, Number = {4}, Pages = {736-739}, Source = {Scopus}, Title = {Theory of electronic and transport properties of resonant triple quantum dot molecules}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-70449380005&partnerID=40&md5=abce28b3f95bd83fa977eb9cd90b9ca4}, Volume = {246}, Year = {2009}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-70449380005&partnerID=40&md5=abce28b3f95bd83fa977eb9cd90b9ca4}} @ARTICLE{Fragner20081357, author={ A. Fragner, M. Göppl, J.M. Fink, M. Baur, R. Bianchetti, P.J. Leek, A. Blais, A. Wallraff}, title={Resolving vacuum fluctuations in an electrical circuit by measuring the lamb shift}, journal={Science}, year={2008}, volume={322}, number={5906}, pages={1357-1360}, document_type={Article}} @ARTICLE{Gambetta2008, author={ J. Gambetta, A. Blais, M. Boissonneault, A.A. Houck, D.I. Schuster, S.M. Girvin}, title={Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect}, journal={Phys. Rev. A}, year={2008}, volume={77}, number={1}, pages={012112}, document_type={Article}, local-url = {Gambetta2008.pdf}} @ARTICLE{Fink2008315, author={ J.M. Fink, M. Göppl, M. Baur, R. Bianchetti, P.J. Leek, A. Blais, A. Wallraff}, title={Climbing the Jaynes-Cummings ladder and observing its √n nonlinearity in a cavity QED system}, journal={Nature}, year={2008}, volume={454}, number={7202}, pages={315-318}, document_type={Article}, local-url = {Fink2008315.pdf}} @ARTICLE{Boissonneault2008, author={ M. Boissonneault, J.M. Gambetta, A. Blais}, title={Nonlinear dispersive regime of cavity QED: The dressed dephasing model}, journal={Phys. Rev. A}, year={2008}, volume={77}, number={6}, pages={060305}, document_type={Article}, local-url = {Boissonneault2008.pdf}} @ARTICLE{Xue2008, author={ P. Xue, B.C. Sanders, A. Blais, K. Lalumière}, title={Quantum walks on circles in phase space via superconducting circuit quantum electrodynamics}, journal={Phys. Rev. A}, year={2008}, volume={78}, number={4}, pages={042334}, document_type={Article}, local-url = {Xue2008.pdf}} @article{blais2008, Year = {2008}, Abstract = {}, author = {A. Blais and J. M. Gambetta}, title = {Filling a cavity with photons, and watching them leave}, journal = {Physics}, volume = {1}, pages = {29}} @article{Awirothananon2008, Abstract = {The energy shell structure of a single exciton confined in a self-assembled quantum dot (QD), including excited states, is studied in a regime where the direct Coulomb attraction energy is comparable to the kinetic energy of the carriers. This is achieved via magnetophotoluminescence excitation spectroscopy experiments, where a magnetic field applied perpendicular to the plane of the QD is used to reveal the angular-momentum content of energy shells. The absorption spectrum of the QDs is modeled, and comparison with experiment allows us to relate the observed transitions to interband QD bound-state transitions. The blueshift of the absorption peaks compared to the emission peaks is then interpreted in terms of many-body interactions, and we show that for a highly symmetric situation, the observed energy difference gives a direct measurement of the extra exchange energy gained upon addition of an extra exciton in the QD. {\copyright} 2008 The American Physical Society.}, Art_Number = {235313}, Author = {Awirothananon, S. and Raymond, S. and Studenikin, S. and Vachon, M. and Render, W. and Sachrajda, A. and Wu, X. and Babinski, A. and Potemski, M. and Fafard, S. and Cheng, S.J. and Korkusinski, M. and Hawrylak, P.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {23}, Source = {Scopus}, Title = {Single-exciton energy shell structure in InAs/GaAs quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-58549115990&partnerID=40&md5=ee04b5a7f73401afc454c6b643888d55}, Volume = {78}, Year = {2008}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-58549115990&partnerID=40&md5=ee04b5a7f73401afc454c6b643888d55}} @Article{Buizert:2008p709, author = {Christo Buizert and Frank H. L Koppens and Michel Pioro-Ladriere and Hans-Peter Tranitz and Ivo T Vink and Seigo Tarucha and Werner Wegscheider and Lieven M. K Vandersypen}, journal = {Phys Rev Lett}, title = {InSitu Reduction of Charge Noise in GaAs/AlxGa1-xAs Schottky-Gated Devices}, abstract = {We show that an insulated electrostatic gate can be used to strongly suppress ubiquitous background charge noise in Schottky-gated GaAs/AlGaAs devices. Via a 2D self-consistent simulation of the conduction band profile we show that this observation can be explained by reduced leakage of electrons from the Schottky gates into the semiconductor through the Schottky barrier, consistent with the effect of "bias cooling." Upon noise reduction, the noise power spectrum generally changes from Lorentzian to 1/f type. By comparing wafers with different Al content, we exclude that DX centers play a dominant role in the charge noise.}, affiliation = {Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands}, number = {22}, pages = {226603}, volume = {101}, year = {2008}, month = {Jan}, language = {English}, keywords = {Quantum Point Contacts, Low-Frequency Noise, Traps}, date-added = {2010-05-14 10:36:44 -0400}, date-modified = {2010-05-14 10:36:44 -0400}, doi = {10.1103/PhysRevLett.101.226603}, pmid = {000261214400039}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p709}, rating = {0} } @Article{Taubert:2008p710, author = {D Taubert and M Pioro-Ladriere and D Schroeer and D Harbusch and A. S Sachrajda and S Ludwig}, journal = {Phys Rev Lett}, title = {Telegraph noise in coupled quantum dot circuits induced by a quantum point contact}, abstract = {Charge detection utilizing a highly biased quantum point contact has become the most effective probe for studying few electron quantum dot circuits. Measurements on double and triple quantum dot circuits is performed to clarify a back action role of charge sensing on the confined electrons. The quantum point contact triggers inelastic transitions, which occur quite generally. Under specific device and measurement conditions these transitions manifest themselves as bounded regimes of telegraph noise within a stability diagram. A nonequilibrium transition from artificial atomic to molecular behavior is identified. Consequences for quantum information applications are discussed.}, affiliation = {Univ Munich, Ctr Nansci, D-80539 Munich, Germany}, number = {17}, pages = {176805}, volume = {100}, year = {2008}, month = {Jan}, language = {English}, keywords = {Single-Electron Spin}, date-added = {2010-05-14 10:36:48 -0400}, date-modified = {2010-05-14 10:36:48 -0400}, doi = {10.1103/PhysRevLett.100.176805}, pmid = {000255524300065}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p710}, rating = {0} } @article{PB08a, Abstract = {Belief propagation --- a powerful heuristic method to solve inference problems involving a large number of random variables --- was recently generalized to quantum theory. Like its classical counterpart, this algorithm is exact on trees when the appropriate independence conditions are met and is expected to provide reliable approximations when operated on loopy graphs. In this paper, we benchmark the performances of loopy quantum belief propagation (QBP) in the context of finite-temperature quantum many-body physics. Our results indicate that QBP provides reliable estimates of the high-temperature correlation function when the typical loop size in the graph is large. As such, it is suitable e.g. for the study of quantum spin glasses on Bethe lattices and the decoding of sparse quantum error correction codes. }, Author = {D. Poulin and E. Bilgin}, Date-Added = {2007-11-19 16:02:55 -0800}, Date-Modified = {2010-05-06 13:46:46 -0400}, Eprint = {arXiv:0710.4304}, Journal = {Phys. Rev. A}, Keywords = {Simulation; Belief propagation}, Local-Url = {PB08a.pdf}, Pages = {052318}, Title = {Belief propagation algorithm for computing correlation functions in finite-temperature quantum many-body systems on loopy graphs}, Volume = {77}, Year = {2008}} @article{PC08a, Abstract = {We address the problem of decoding sparse quantum error correction codes. For Pauli channels, this task can be accomplished by a version of the belief propagation algorithm used for decoding sparse classical codes. Quantum codes pose two new challenges however. Firstly, their Tanner graph unavoidably contain small loops which typically undermines the performance of belief propagation. Secondly, sparse quantum codes are by definition highly degenerate. The standard belief propagation algorithm does not exploit this feature, but rather it is impaired by it. We propose heuristic methods to improve belief propagation decoding, specifically targeted at these two problems. While our results exhibit a clear improvement due to the proposed heuristic methods, they also indicate that the main source of errors in the quantum coding scheme remains in the decoding. }, Author = {D. Poulin and Y. Chung}, Date-Added = {2007-11-19 11:11:22 -0800}, Date-Modified = {2010-05-06 13:42:31 -0400}, Eprint = {arXiv:0801.1241}, Journal = {Quant. Info. and Comp.}, Keywords = {LDPC; Belief propagation}, Local-Url = {PC08a.pdf}, Pages = {986}, Title = {On the iterative decoding of sparse quantum codes}, Volume = {8}, Year = {2008}} @conference{PTO08a, Abstract = {We present a theory of quantum serial turbo-codes and study their performance numerically on a depolarization channel. These codes can be considered as a generalization of classical serial turbo-codes. As their classical cousins, they can be iteratively decoded and with well chosen constituent convolutional codes, we observe an important reduction of the word error rate as the number of encoded qubits increases. Our construction offers several advantages over quantum LDPC codes. First, the Tanner graph used for decoding can be chosen to be free of 4-cycles that deteriorate the performances of iterative decoding. Secondly, the iterative decoder makes explicit use of the code's degeneracy. Finally, there is complete freedom in the code design in terms of length, rate, memory size, and interleaver choice. We address two issues related to the encoding of convolutional codes that are directly relevant for turbo-codes, namely the character of being recursive and non-catastrophic. We define a quantum analogue of a state diagram that provides an efficient way to verify these properties on a given quantum convolutional encoder. Unfortunately, we also prove that all recursive quantum convolutional encoder have catastrophic error propagation. In our constructions, the convolutional codes have thus been chosen to be non-catastrophic and non-recursive. While the resulting families of turbo-codes have bounded minimum distance, from a pragmatic point of view the effective minimum distances of the codes that we have simulated are large enough for not degrading iterative decoding performance up to reasonable word error rates and block sizes.}, Author = {David Poulin and Jean-Pierre Tillich and Harold Ollivier}, Booktitle = {ISIT'08}, Date-Added = {2008-05-13 10:27:47 -0700}, Date-Modified = {2010-05-06 13:45:01 -0400}, Keywords = {Turbo Codes; Error correction}, Local-Url = {PTO08a.pdf}, Publisher = {IEEE}, Title = {Quantum serial turbo-codes}, Year = {2008}} @article{Delgado2008, Abstract = {We present a theory of spin-selective Aharonov-Bohm oscillations in a lateral triple quantum dot. We show that to understand the Aharonov-Bohm (AB) effect in an interacting electron system within a triple quantum dot molecule (TQD) where the dots lie in a ring configuration requires one to not only consider electron charge but also spin. Using a Hubbard model supported by microscopic calculations we show that, by localizing a single electron spin in one of the dots, the current through the TQD molecule depends not only on the flux but also on the relative orientation of the spin of the incoming and localized electrons. AB oscillations are predicted only for the spin singlet electron complex resulting in a magnetic field tunable "spin valve." {\copyright} 2008 The American Physical Society.}, Art_Number = {226810}, Author = {Delgado, F. and Shim, Y.-P. and Korkusinski, M. and Gaudreau, L. and Studenikin, S.A. and Sachrajda, A.S. and Hawrylak, P.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {22}, Source = {Scopus}, Title = {Spin-selective aharonov-bohm oscillations in a lateral triple quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-57149113724&partnerID=40&md5=c9f05fdac83303db895ef96258ca74e5}, Volume = {101}, Year = {2008}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-57149113724&partnerID=40&md5=c9f05fdac83303db895ef96258ca74e5}} @article{GP08a, Abstract = {In the context of constrained quantum mechanics, reference systems are used to construct relational observables that are invariant under the action of the symmetry group. Upon measurement of a relational observable, the reference system undergoes an unavoidable measurement "back-action" that modifies its properties. In a quantum-gravitational setting, it has been argued that such a back-action may produce effects that are described at an effective level as a form of deformed (or doubly) special relativity. We examine this possibility using a simple constrained system that has been extensively studied in the context of quantum information. While our conclusions support the idea of a symmetry deformation, they also reveal a host of other effects that may be relevant to the context of quantum gravity, and could potentially conceal the symmetry deformation.}, Author = {F. Girelli and D. Poulin}, Date-Added = {2007-11-19 15:58:17 -0800}, Date-Modified = {2010-05-06 13:43:33 -0400}, Eprint = {arXiv:0710.4393}, Journal = {Phys. Rev. D}, Keywords = {Reference frame; Gravity; Foundations}, Local-Url = {GP07b.pdf}, Pages = {104012}, Title = {Quantum reference frames and deformed symmetries}, Volume = {77}, Year = {2008}} @ARTICLE{Gabelli2008, author = {Gabelli, J., Reulet, B.}, title = {Dynamics of quantum noise in a tunnel junction under AC excitation}, journal = {Physical Review Letters}, year = {2008}, volume = {100, 026601}, number = {2}, art_number = {026601}, note = {cited By (since 1996) 1}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-38349155233&partnerID = 40&md5 = d1c58fbe8d2a2f79ffac4edbbc281be4}, affiliation = {Laboratoire de Physique des Solides, UMR8502, Université Paris-Sud, 91405 ORSAY Cedex, France}, abstract = {We report the first measurement of the dynamical response of shot noise (measured at frequency ω) of a tunnel junction to an ac excitation at frequency ω0. The experiment is performed in the quantum regime, ω∼ ω0 kBT at very low temperature T = 35mK and high frequency ω0/2Ï€ = 6.2GHz. We observe that the noise responds in phase with the excitation, but not adiabatically. The results are in very good agreement with a prediction based on a new current-current correlator. 2008 The American Physical Society.}, document_type = {Article}, source = {Scopus}} @article{Gaudreau2008978, Abstract = {It has been previously demonstrated, employing charge detection techniques, that quantum cellular automata (QCA) processes exist in the vicinity of quadruple degeneracy points in both ring and serial arrangements of lateral triple quantum dots. The effect is primarily an electrostatic one. In this paper, we report on transport measurements through a triple dot potential and study experimentally the interplay between these QCA phenomena and the Pauli (spin) blockade effect. We demonstrate experimentally that the interaction between these processes leads to a higher order and indirect form of spin blockade in which the QCA effect itself is blockaded. Crown Copyright {\copyright} 2007.}, Author = {Gaudreau, L. and Sachrajda, A.S. and Studenikin, S.A. and Zawadzki, P. and Kam, A.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {5}, Pages = {978-981}, Source = {Scopus}, Title = {Spin blockade of quantum cellular automata effects in a few electron triple quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-39649091651&partnerID=40&md5=034373b13ba03b1ec01f81645993c5c9}, Volume = {40}, Year = {2008}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-39649091651&partnerID=40&md5=034373b13ba03b1ec01f81645993c5c9}} @article{Reulet200807, Year = {2008}, Abstract = {}, title = {Le bruit dissymétrique du courant électrique}, author = {J. Gabelli et B. Reulet}, journal = {Images de la Physique 2007}} @Article={PioroLadriere:2008p9, author = {M Pioro-Ladriere and T Obata and Y Tokura and Y. -S Shin and T Kubo and K Yoshida and T Taniyama and S Tarucha}, journal = {Nat Phys}, title = {Electrically driven single-electron spin resonance in a slanting Zeeman field}, abstract = {The rapid rise of spintronics and quantum information science has led to a strong interest in developing the ability to coherently manipulate electron spins(1). Electron spin resonance(2) is a powerful technique for manipulating spins that is commonly achieved by applying an oscillating magnetic field. However, the technique has proven very challenging when addressing individual spins(3-5). In contrast, by mixing the spin and charge degrees of freedom in a controlled way through engineered non-uniform magnetic fields, electron spin can be manipulated electrically without the need of high-frequency magnetic fields(6,7). Here we report experiments in which electrically driven addressable spin rotations on two individual electrons were realized by integrating a micrometre-size ferromagnet into a double-quantum-dot device. We find that it is the stray magnetic field of the micromagnet that enables the electrical control and spin selectivity. The results suggest that our approach can be tailored to multidot architecture and therefore could open an avenue towards manipulating electron spins electrically in a scalable way.}, affiliation = {Japan Sci & Technol Agcy, ICORP, Quantum Spin Informat Project, Atsugi, Kanagawa 2430198, Japan}, number = {10}, pages = {776--779}, volume = {4}, year = {2008}, month = {Jan}, language = {English}, keywords = {Manipulation, Double-Quantum Dots}, date-added = {2009-12-07 09:47:29 -0500}, date-modified = {2009-12-07 09:47:43 -0500}, doi = {10.1038/nphys1053}, pmid = {000259686800010}, URL = {http://www.nature.com/nphys/journal/v4/n10/abs/nphys1053.html}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p9}, rating = {0}} @article{LP08a, Abstract = {Belief Propagation algorithms acting on Graphical Models of classical probability distributions, such as Markov Networks, Factor Graphs and Bayesian Networks, are amongst the most powerful known methods for deriving probabilistic inferences amongst large numbers of random variables. This paper presents a generalization of these concepts and methods to the quantum case, based on the idea that quantum theory can be thought of as a noncommutative, operator-valued, generalization of classical probability theory. Some novel characterizations of quantum conditional independence are derived, and definitions of Quantum n-Bifactor Networks, Markov Networks, Factor Graphs and Bayesian Networks are proposed. The structure of Quantum Markov Networks is investigated and some partial characterization results are obtained, along the lines of the Hammersely-Clifford theorem. A Quantum Belief Propagation algorithm is presented and is shown to converge on 1-Bifactor Networks and Markov Networks when the underlying graph is a tree. The use of Quantum Belief Propagation as a heuristic algorithm in cases where it is not known to converge is discussed. Applications to decoding quantum error correcting codes and to the simulation of many-body quantum systems are described. }, Author = {M.S. Leifer and D. Poulin}, Date-Added = {2007-07-26 15:19:50 -0700}, Date-Modified = {2010-05-06 13:41:46 -0400}, Eprint = {arXiv:0708.1337}, Journal = {Ann. Phys.}, Keywords = {Simulation; LDPC; Turbo Codes; Belief propagation}, Local-Url = {LP08a.pdf}, Pages = {1899}, Title = {Quantum graphical models and belief propagation}, Volume = {323}, Year = {2008}} @Article{PioroLadriere:2008p10, author = {Michel Pioro-Ladriere and Toshiaki Obata and Yasuhiro Tokura and You-Sok Shin and Toshihiro Kubo and Katsuharu Yoshida and Tomoyasu Taniyama and Seigo Tarucha}, journal = {Prog Theor Phys Supp}, title = {Selective Manipulation of Electron Spins with Electric Fields}, abstract = {We develop a micro-magnet technique to manipulate single electron spins electrically with a large potential for scalability. We demonstrate that the technique works by rotating independently two electron spins in a double quantum dot circuit integrating a micrometersize ferromagnet. We find that it is the stray magnetic field of the micro-magnet that enables the electrical control and spin selectivity. Based on these results, we propose a scalable architecture for quantum information processing with electron spins using a tailored split micro-magnet geometry.}, affiliation = {Japan Sci {\&} Technol Agcy, ICORP, Quantum Spin Informat Project, Atsugi, Kanagawa 2430198, Japan}, number = {176}, pages = {322--340}, year = {2008}, month = {Jan}, language = {English}, keywords = {Computation, Double-Quantum Dots}, date-added = {2009-12-07 09:56:52 -0500}, date-modified = {2009-12-07 10:24:07 -0500}, pmid = {000263348100018}, rating = {0}} @Article{Lambert:2008p706, author = {N Lambert and I Mahboob and M Pioro-Ladriere and Y Tokura and S Tarucha and H Yamaguchi}, journal = {Phys Rev Lett}, title = {Electron-spin manipulation and resonator readout in a double-quantum-dot nanoelectromechanical system}, abstract = {We demonstrate how magnetically coupling a nanomechanical resonator to a double quantum dot confining two electrons can enable the manipulation of a single electron spin and the readout of the resonator's natural frequency. When the Larmor frequency matches the resonator frequency, the electron spin in one of the dots can be selectively and coherently flipped by the magnetized oscillator. By simultaneously measuring the charge state of the two-electron double quantum dots, this transition can be detected thus enabling the natural frequency and displacement of the mechanical oscillator to be determined.}, affiliation = {RIKEN, FRS, Single Quantum Dynam Res Grp, Digital Mat Lab, Wako, Saitama 3510198, Japan}, number = {13}, pages = {136802}, volume = {100}, year = {2008}, month = {Jan}, language = {English}, keywords = {Computation}, date-added = {2010-05-14 10:36:17 -0400}, date-modified = {2010-05-14 10:36:17 -0400}, doi = {10.1103/PhysRevLett.100.136802}, pmid = {000254670300063}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p706}, rating = {0} } @article{BNPV08a, Abstract = {We introduce a general operational characterization of information-preserving structures (IPS) -- encompassing noiseless subsystems, decoherence-free subspaces, pointer bases, and error-correcting codes -- by demonstrating that they are isometric to fixed points of unital quantum processes. Using this, we show that every IPS is a matrix algebra. We further establish a structure theorem for the fixed states and observables of an arbitrary process, which unifies the Schr{"o}dinger and Heisenberg pictures, places restrictions on physically allowed kinds of information, and provides an efficient algorithm for finding all noiseless and unitarily noiseless subsystems of the process.}, Author = {R. Blume-Kohout and H.K. Ng and D. Poulin and L. Viola}, Date-Added = {2007-05-29 15:46:08 -0700}, Date-Modified = {2010-05-06 13:41:03 -0400}, Eprint = {arXiv:0705.4282}, Journal = {Phys. Rev. Lett.}, Keywords = {Error correction}, Local-Url = {BNPV08a.pdf}, Pages = {030501}, Title = {The structure of preserved information in quantum processes}, Volume = {100}, Year = {2008}} @article{Rasanen2008, Abstract = {Two-dimensional semiconductor quantum dots are studied in the filling-factor range 2<ν<3. We find both theoretical and experimental evidence of a collective many-body phenomenon, where a fraction of the trapped electrons form an incompressible spin droplet on the highest occupied Landau level. The phenomenon occurs only when the number of electrons in the quantum dot is larger than ∼30. We find the onset of the spin-droplet regime at ν=5/2. This proposes a finite-geometry alternative to the Moore-Read-type Pfaffian state of the bulk two-dimensional electron gas. Hence, the spin-droplet formation may be related to the observed fragility of the ν=5/2 quantum Hall state in narrow quantum point contacts. {\copyright} 2008 The American Physical Society.}, Art_Number = {041302}, Author = {R{\"a}s{\"a}nen, E. and Saarikoski, H. and Harju, A. and Ciorga, M. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {4}, Source = {Scopus}, Title = {Spin droplets in confined quantum Hall systems}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-38049025656&partnerID=40&md5=68257052c39caa158dceabaebca2dfcb}, Volume = {77}, Year = {2008}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-38049025656&partnerID=40&md5=68257052c39caa158dceabaebca2dfcb}} @article{Studenikin20081424, Abstract = {In this work we investigate microwave induced resistance oscillations (MIROs) in a GaAs/AlGaAs heterostructure containing a high mobility two-dimensional electron gas (2DEG). We show that MIROs can be explained within a purely classical mechanism based on the Boltzmann equation [L.I. Magarill, I.A. Panaev, S.A. Studenikin, Condens. Matter 7 (1995) 1101]. The MIRO-related transitions can be observed in absorption and we demonstrate it experimentally for the first time using EPR-cavity absorption technique. Next we investigate MIROs and Shubnikov-de Haas (SdH) oscillations at milli-Kelvin temperatures. We find that MIROs persist to approximately three times lower magnetic field as compared with the SdH oscillations, which at temperatures below 50 mK are defined purely by the quantum relaxation time. This finding indicates a possible quasi-classical origin of MIROs. Crown Copyright {\copyright} 2007.}, Author = {Studenikin, S.A. and Fedorych, O.N. and Maude, D.K. and Potemski, M. and Sachrajda, A.S. and Wasilewski, Z.R. and Gupta, J.A. and Magarill, L.I.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {5}, Pages = {1424-1426}, Source = {Scopus}, Title = {A quasi-classical mechanism for microwave induced resistance oscillations in high mobility GaAs/AlGaAs 2DEG samples}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-39649113530&partnerID=40&md5=0782c42177d3169304397bc592a6d248}, Volume = {40}, Year = {2008}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-39649113530&partnerID=40&md5=0782c42177d3169304397bc592a6d248}} @article{Taubert2008, Abstract = {Charge detection utilizing a highly biased quantum point contact has become the most effective probe for studying few electron quantum dot circuits. Measurements on double and triple quantum dot circuits is performed to clarify a back action role of charge sensing on the confined electrons. The quantum point contact triggers inelastic transitions, which occur quite generally. Under specific device and measurement conditions these transitions manifest themselves as bounded regimes of telegraph noise within a stability diagram. A nonequilibrium transition from artificial atomic to molecular behavior is identified. Consequences for quantum information applications are discussed. {\copyright} 2008 The American Physical Society.}, Art_Number = {176805}, Author = {Taubert, D. and Pioro-Ladri{\`e}re, M. and Schr{\"o}er, D. and Harbusch, D. and Sachrajda, A.S. and Ludwig, S.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {17}, Source = {Scopus}, Title = {Telegraph noise in coupled quantum dot circuits induced by a quantum point contact}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-43049103062&partnerID=40&md5=87acb149ef1d9ec3edad385c614056fa}, Volume = {100}, Year = {2008}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-43049103062&partnerID=40&md5=87acb149ef1d9ec3edad385c614056fa}} @ARTICLE{Blais2007, author={ A. Blais, J. Gambetta, A. Wallraff, D.I. Schuster, S.M. Girvin, M.H. Devoret, R.J. Schoelkopf}, title={Quantum-information processing with circuit quantum electrodynamics}, journal={Phys. Rev. A}, year={2007}, volume={75}, number={3}, pages={032329}, document_type={Article}, local-url = {Blais2007.pdf}} @ARTICLE{Schuster2007515, author={ D.I. Schuster, A.A. Houck, J.A. Schreier, A. Wallraff, J.M. Gambetta, A. Blais, L. Frunzio, J. Majer, B. Johnson, M.H. Devoret, S.M. Girvin, R.J. Schoelkopf}, title={Resolving photon number states in a superconducting circuit}, journal={Nature}, year={2007}, volume={445}, number={7127}, pages={515-518}, document_type={Article}, local-url = {Schuster2007515.pdf}} @ARTICLE{Koch2007, author={ J. Koch, T.M. Yu, J. Gambetta, A.A. Houck, D.I. Schuster, J. Majer, A. Blais, M.H. Devoret, S.M. Girvin, R.J. Schoelkopf}, title={Charge-insensitive qubit design derived from the Cooper pair box}, journal={Phys. Rev. A}, year={2007}, volume={76}, number={4}, pages={042319}, document_type={Article}, local-url = {Koch2007.pdf}} @ARTICLE{Majer2007443, author={ J. Majer, J.M. Chow, J.M. Gambetta, J. Koch, B.R. Johnson, J.A. Schreier, L. Frunzio, D.I. Schuster, A.A. Houck, A. Wallraff, A. Blais, M.H. Devoret, S.M. Girvin, R.J. Schoelkopf}, title={Coupling superconducting qubits via a cavity bus}, journal={Nature}, year={2007}, volume={449}, number={7161}, pages={443-447}, document_type={Article}, local-url = {Majer2007443.pdf}} @ARTICLE{Leek20071889, author={ P.J. Leek, J.M. Fink, A. Blais, R. Bianchetti, M. Göppl, J.M. Gambetta, D.I. Schuster, L. Frunzio, R.J. Schoelkopf, A. Wallraff}, title={Observation of Berry's phase in a solid-state qubit}, journal={Science}, year={2007}, volume={318}, number={5858}, pages={1889-1892}, document_type={Article}, local-url={BerryExp.pdf}} @article{Wallraff:2007a, title = {Sideband Transitions and Two-Tone Spectroscopy of a Superconducting Qubit Strongly Coupled to an On-Chip Cavity}, author = {A. Wallraff, D. I. Schuster, A. Blais, J. M. Gambetta, J. Schreier, L. Frunzio, M. H. Devoret, S. M. Girvin and R. J. Schoelkopf}, journal = {Phys. Rev. Lett.}, volume = {99}, issue = {5}, pages = {050501}, numpages = {4}, year = {2007}, month = {Jul}, doi = {10.1103/PhysRevLett.99.050501}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.99.050501}, local-url = {PhysRevLett.99.050501.pdf}} @article{zagoskin2007, Year = {2007}, Abstract = {}, author = {A. Zagoskin and A. Blais}, title = {Superconducting qubits}, journal = {Can J. of Physics}, volume = {63}, pages = {215}, local-url = {zagoskin2007.pdf}} @ARTICLE{Angers2007, author = {Angers, L., Chepelianskii, A., Deblock, R., Reulet, B., Bouchiat, H.}, title = {Mesoscopic photovoltaic effect in GaAs/Ga1-x Alx As Aharonov-Bohm rings}, journal = {Physical Review B - Condensed Matter and Materials Physics}, year = {2007}, volume = {76, 075331}, number = {7}, art_number = {075331}, note = {cited By (since 1996) 5}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-34548014093&partnerID = 40&md5 = f3547d4734591b31cafc46880e4d6908}, affiliation = {Université Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France}, abstract = {When submitted to a high-frequency radiation at low temperature, a mesoscopic conductor develops a sample specific dc voltage. We have investigated this photovoltaic (PV) effect on GaAs/Ga1-x Alx As Aharonov-Bohm rings at temperatures varying between 30 mK and 1 K. The rf induced PV voltage is a purely mesoscopic effect which exhibits both periodic and aperiodic magnetic flux dependences with zero average value. The harmonics content and symmetry of this flux dependent PV voltage close to zero field depend on the radiation frequency compared to the inverse diffusion time around the sample. The frequency dependence also exhibits sharp resonances which position sign and amplitude strongly depend on magnetic field. We attribute these resonances to the presence of two level systems at resonance with the frequency of the electromagnetic field. 2007 The American Physical Society.}, document_type = {Article}, source = {Scopus}} @conference{Byszewski2007655, Abstract = {We report on photoluminescence experiments carried out at very low temperatures and with magnetic fields up to 28T. performed on a high mobility two-dimensional electron gas GaAs/AlGaAs quantum well. Our experiments show that clear signatures of the v =1/3, 2/5, 3/7, 3/5, 2/3, 1 sequence of the FQHE states can also be easily visible even in raw magneto-photoluminescence spectra. Theoretical calculations of excitonic transitions suggest that an explanation of the red shift of emission energy at the Hall plateau boundary may be due to the appearance of additional free charged quasi-particles that bind to an exciton, forming a fractionally charged exciton whose emission energy is expected to be lower, in analogy to well known charged excitons in n-type semiconductors. The magnitude of the shift is a measure of the fractionally charged exciton binding energy. Emission in the insulating state of 2DEG at v = 1/3 is attributed to a neutral quasi-exciton whose complicated energy dispersion results in an emission doublet with its low energy line due to the recombination from excited excitonic states. {\copyright} 2007 American Institute of Physics.}, Author = {Byszewski, M. and Chwalisz-Pietka, B. and Maude, D.K. and Sadowski, M.L. and Potemski, M. and Saku, T. and Hirayama, Y. and Studenikin, S. and Austing, G. and Sachrajda, A.S. and Hawrylak, P.}, Document_Type = {Conference Paper}, Journal = {AIP Conference Proceedings}, Pages = {655-656}, Source = {Scopus}, Title = {Charged excitons in fractional quantum Hall regime}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77958516107&partnerID=40&md5=5d78e48bd155e51a6b93f5d0a9ad4a1f}, Volume = {893}, Year = {2007}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77958516107&partnerID=40&md5=5d78e48bd155e51a6b93f5d0a9ad4a1f}} @article{PY07a, Abstract = {We analyze a quantum mechanical gyroscope which is modeled as a large spin and used as a reference against which to measure the angular momenta of spin-1/2 particles. These measurements induce a back-action on the reference which is the central focus of our study. We begin by deriving explicit expressions for the quantum channel representing the back-action. Then, we analyze the dynamics incurred by the reference when it is used to sequentially measure particles drawn from a fixed ensemble. We prove that the reference thermalizes with the measured particles and find that generically, the thermal state is reached in time which scales linearly with the size of the reference. This contrasts a recent conclusion of Bartlett et al. that this takes a quadratic amount of time when the particles are completely unpolarized. We now understand their result in terms of a simple physical principle based on symmetries and conservation laws. Finally, we initiate the study of the non-equilibrium dynamics of the reference. Here we find that a reference in a coherent state will essentially remain in one when measuring polarized particles, while rotating itself to ultimately align with the polarization of the particles. }, Author = {D. Poulin and J. Yard}, Date-Added = {2007-02-01 08:54:10 -0800}, Date-Modified = {2010-05-06 13:47:34 -0400}, Eprint = {quant-ph/0612126}, Journal = {New J. Phys.}, Keywords = {Reference frame}, Local-Url = {PY07a.pdf}, Pages = {156}, Title = {Dynamics of a Quantum Reference Frame}, Volume = {9}, Year = {2007}} @conference{GP07a, Abstract = {Deformed Special Relativity (DSR) is a candidate phenomenological theory to describe the Quantum Gravitational (QG) semi-classical regime. A possible interpretation of DSR can be derived from the notion of deformed reference frame. Observables in (quantum) General Relativity can be constructed from (quantum) reference frame -- a physical observable is then a relation between a system of interest and the reference frame. We present a toy model and study an example of such quantum relational observables. We show how the intrinsic quantum nature of the reference frame naturally leads to a deformation of the symmetries, comforting DSR to be a good candidate to describe the QG semi-classical regime.}, Author = {F. Girelli and D. Poulin}, Date-Added = {2007-09-19 13:49:01 -0700}, Date-Modified = {2010-05-06 13:48:22 -0400}, Journal = {J. of Phys.: Conf. Series, 12th Conference on Recent Developments in Gravity}, Keywords = {Reference frame; Gravity}, Local-Url = {GP07a.pdf}, Number = {012025}, Title = {Deformed symmetries from quantum relational observables}, Volume = {68}, Year = {2007}} @CONFERENCE{Gabelli2007, author = {Gabelli, J., Reulet, B.}, title = {The noise susceptibility of a coherent conductor}, journal = {Proceedings of SPIE - Fluctuations and Noise in Materials}, year = {2007}, volume = {6600-25}, art_number = {66000T}, note = {cited By (since 1996) 0}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-36249016243&partnerID = 40&md5 = 2e4b4ee0659bc9f66428aeaa1423dcfe}, affiliation = {Laboratoire de Physique des Solides, UMR8502 Bâtiment 510, Université Paris-Sud, 91405 Orsay Cedex, France}, abstract = {The complex ac conductance G(ω0) of a system measures the dynamical response of the current to a small voltage excitation at frequency ω0. It cannot in general be deduced from the only knowledge of the dc I(V) characteristics. Similarly, we investigate the dynamical response of current noise to an ac excitation, i.e. the in-phase and out-of-phase response of current noise density S(ω) measured at frequency ω. We present a detailed calculation of this new response function Χω0 (ω), that we name noise susceptibility, at arbitrary frequencies for a coherent conductor in the scattering matrix formalism. We exemplify the relevance of our calculation by the measurement of the noise susceptibility of a tunnel junction in the quantum regime ℏω ∼ ℏω0 ≫ kBT, which is in remarkable agreement with our theory.}, author_keywords = {Dynamics; Quantum noise; Shot noise}, document_type = {Conference Paper}, source = {Scopus}} @conference{Gaudreau2007857, Abstract = {A few electron double electrostatic lateral quantum dot can be transformed into a few electron triple quantum dot by applying a different combination of gate voltages. Quadruple points have been achieved at which all three dots are simultaneously on resonance. At these special points in the stability diagram four occupation configurations are possible. Both charge detection and transport experiments have been performed on this device. In this short paper we present data and confirm that transport is coherent by observing a π phase shift in magneto-conductance oscillations as one passes through the quadruple point. {\copyright} 2007 American Institute of Physics.}, Author = {Gaudreau, L. and Sachrajda, A.S. and Studenikin, S. and Zawadzki, P. and Kam, A. and Lapointe, J.}, Document_Type = {Conference Paper}, Journal = {AIP Conference Proceedings}, Pages = {857-858}, Source = {Scopus}, Title = {Coherent transport through a quadruple point in a few electron triple dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77958504145&partnerID=40&md5=657eab3c2e250aceb7d0795cf5686ce8}, Volume = {893}, Year = {2007}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77958504145&partnerID=40&md5=657eab3c2e250aceb7d0795cf5686ce8}} @article{Kershaw2007, Abstract = {The decay of quasi-persistent circulating currents in the dissipationless quantum Hall regime has been observed. The currents induced by a time-varying magnetic field flow within a two-dimensional electron system (2DES) embedded in a GaAs-(Al,Ga)As heterojunction. The associated magnetic moment is measured using a highly sensitive magnetometer. The currents are observed to continue circulating for many hours after the magnetic field sweep is stopped indicating a very low sheet resistivity. Two distinct current decay regimes are observed, consisting of an initial exponential decay lasting a few tens of seconds followed by a much slower power-law decay. The presence of the fast initial decay, during which the current falls typically to half of its original value, indicates that the system is initially quite dissipative because the quantum Hall effect (QHE) has broken down due to the large induced current. As the current decays, the quasi-dissipationless QHE state recovers, resulting in the much slower decay, which the data suggest will persist for at least several days, much longer than has previously been suggested. The power-law form of the long decay suggests multiple relaxation paths for the system to return to equilibrium, each having a different characteristic time constant. This can equivalently be thought of as a resistivity which gradually falls with current. {\copyright} IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.}, Art_Number = {71}, Author = {Kershaw, T.J. and Usher, A. and Sachrajda, A.S. and Gupta, J. and Wasilewski, Z.R. and Elliott, M. and Ritchie, D.A. and Simmons, M.Y.}, Document_Type = {Article}, Journal = {New Journal of Physics}, Source = {Scopus}, Title = {Decay of long-lived quantum Hall induced currents in 2D electron systems}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33947597964&partnerID=40&md5=6504b84f8630cee615fef33b9af79499}, Volume = {9}, Year = {2007}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33947597964&partnerID=40&md5=6504b84f8630cee615fef33b9af79499}} @article{Korkusinski2007, Abstract = {We analyze theoretically and experimentally the electronic structure and charging diagram of three coupled lateral quantum dots filled with electrons. Using the Hubbard model and real-space exact diagonalization techniques we show that the electronic properties of this artificial molecule can be understood using a set of topological Hunds rules. These rules relate the multielectron energy levels to spin and the interdot tunneling t, and control charging energies. We map out the charging diagram for up to N=6 electrons and predict a spin-polarized phase for two holes. The theoretical charging diagram is compared with the measured charging diagram of the gated triple-dot device. {\copyright} 2007 The American Physical Society.}, Art_Number = {115301}, Author = {Korkusinski, M. and Gimenez, I.P. and Hawrylak, P. and Gaudreau, L. and Studenikin, S.A. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {11}, Source = {Scopus}, Title = {Topological Hunds rules and the electronic properties of a triple lateral quantum dot molecule}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33847363255&partnerID=40&md5=3c91c3cd4e0d91b0f0c4880006d7616e}, Volume = {75}, Year = {2007}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33847363255&partnerID=40&md5=3c91c3cd4e0d91b0f0c4880006d7616e}} @Article{PioroLadriere:2007p722, author = {M Pioro-Ladriere and Y Tokura and T Obata and T Kubo and S Tarucha}, journal = {Appl Phys Lett}, title = {Micromagnets for coherent control of spin-charge qubit in lateral quantum dots}, abstract = {A lateral quantum dot design for coherent electrical manipulation of a two-level spin-charge system is presented. Two micron-size permanent magnets integrated to high-frequency electrodes produce a static slanting magnetic field suitable for voltage controlled single qubit gate operations. Stray field deviation from the slanting form is taken into account in the Hamiltonian describing the two-level system, which involves hybridization of a single electron spin to the quantum dot's orbitals. Operation speed and gate fidelity are related to device parameters. Sub-100-ns pi pulse duration can be achieved with lattice fluctuation coherence time of 4 ms for GaAs. (c) 2007 American Institute of Physics.}, affiliation = {Japan Sci {\&} Technol Agcy, ICORP, Quantum Spin Informat Project, Atsugi, Kanagawa 2430198, Japan}, number = {2}, pages = {024105}, volume = {90}, year = {2007}, month = {Jan}, language = {English}, keywords = {Computation, Manipulation, Single-Electron Spin}, date-added = {2010-05-14 10:36:59 -0400}, date-modified = {2010-05-14 10:36:59 -0400}, doi = {10.1063/1.2430906}, pmid = {000243582000102}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p722}, rating = {0} } @article{Moreau20071579, Abstract = {In this paper, we study the behavior of a high mobility two dimensional electron gas under microwave irradiation by means of magneto-photoluminescence (PL) and absorption measurements. The high mobility sample investigated is a 15nm wide GaAs/AlGaAs quantum well with an electron concentration between 1-2×1011cm-2, tunable by visible-light illumination. Structures in the microwave absorption at 40-60GHz are identified as geometrically confined magneto-plasmons. {\copyright} World Scientific Publishing Company.}, Author = {Moreau, S. and Fedorych, O.M. and Sadowski, M.L. and Potemski, M. and Studenikin, S. and Austing, G. and Sachrajda, A.S. and Saku, T. and Hirayama, Y.}, Document_Type = {Conference Paper}, Journal = {International Journal of Modern Physics B}, Number = {8-9}, Pages = {1579-1583}, Source = {Scopus}, Title = {Response of A 2DEG to microwave irradiation}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-34248676601&partnerID=40&md5=3debba406af5b7daa9daf60c3994ebc4}, Volume = {21}, Year = {2007}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-34248676601&partnerID=40&md5=3debba406af5b7daa9daf60c3994ebc4}} @article{NP07a, Abstract = { Operator quantum error-correction is a technique for robustly storing quantum information in the presence of noise. It generalizes the standard theory of quantum error-correction, and provides a unified framework for topics such as quantum error-correction, decoherence-free subspaces, and noiseless subsystems. This paper develops (a) easily applied algebraic and information-theoretic conditions which characterize when operator quantum error-correction is feasible; (b) a representation theorem for a class of noise processes which can be corrected using operator quantum error-correction; and (c) generalizations of the coherent information and quantum data processing inequality to the setting of operator quantum error-correction.}, Author = {Nielsen, M. A. and Poulin, D.}, Date-Added = {2005-07-05 14:02:02 +1000}, Date-Modified = {2010-05-06 13:45:43 -0400}, Eprint = {quant-ph/0506069}, Journal = {Phys. Rev. A}, Keywords = {Error correction; OQEC}, Local-Url = {NP07a.pdf}, Pages = {064304}, Title = {Algebraic and information-theoretic conditions for operator quantum error-correction}, Volume = {75}, Year = {2007}} @article{Studenikin2007, Abstract = {The frequency dependence of microwave-induced resistance oscillations (MIROs) has been studied experimentally in high-mobility electron GaAs/AlGaAs structures to explore the limits at which these oscillations can be observed. It is found that in dc transport experiments at frequencies above 120 GHz, MIROs start to quench, while above 230 GHz, they completely disappear. The results will need to be understood theoretically but are qualitatively discussed within a model in which forced electronic charge oscillations (plasmons) play an intermediate role in the interaction process between the radiation and the single-particle electron excitations between Landau levels. {\copyright} 2007 The American Physical Society.}, Art_Number = {165321}, Author = {Studenikin, S.A. and Sachrajda, A.S. and Gupta, J.A. and Wasilewski, Z.R. and Fedorych, O.M. and Byszewski, M. and Maude, D.K. and Potemski, M. and Hilke, M. and West, K.W. and Pfeiffer, L.N.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {16}, Source = {Scopus}, Title = {Frequency quenching of microwave-induced resistance oscillations in a high-mobility two-dimensional electron gas}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-35648943700&partnerID=40&md5=9aa55aefa7154aa601d2fec04a49a3e5}, Volume = {76}, Year = {2007}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-35648943700&partnerID=40&md5=9aa55aefa7154aa601d2fec04a49a3e5}} @Article{Obata:2007p716, author = {Toshiaki Obata and Michel Pioro-Ladriere and Toshihiro Kubo and Katsuharu Yoshida and Yasuhiro Tokura and Seigo Tarucha}, journal = {Rev Sci Instrum}, title = {Microwave band on-chip coil technique for single electron spin resonance in a quantum dot}, abstract = {Microwave band on-chip microcoils are developed for the application to single electron spin resonance measurement with a single quantum dot. Basic properties such as characteristic impedance and electromagnetic field distribution are examined for various coil designs by means of experiment and simulation. The combined setup operates relevantly in the experiment at dilution temperature. The frequency responses of the return loss and Coulomb blockade current are examined. Capacitive coupling between a coil and a quantum dot causes photon assisted tunneling, whose signal can greatly overlap the electron spin resonance signal. To suppress the photon assisted tunneling effect, a technique for compensating for the microwave electric field is developed. Good performance of this technique is confirmed from measurement of Coulomb blockade oscillations. (C) 2007 American Institute of Physics.}, affiliation = {JST, ICORP, Quantum Spin Informat Project, Atsugi, Kanagawa 2430198, Japan}, number = {10}, pages = {104704}, volume = {78}, year = {2007}, month = {Jan}, language = {English}, keywords = {Dielectric-Constant, Gaas, Temperature-Dependence, Manipulation, Photon, Qubits}, date-added = {2010-05-14 10:36:52 -0400}, date-modified = {2010-05-14 10:36:52 -0400}, doi = {10.1063/1.2799735}, pmid = {000250589800047}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p716}, rating = {0} } @ARTICLE{Gambetta2006, author={ J. Gambetta, A. Blais, D.I. Schuster, A. Wallraff, L. Frunzio, J. Majer, M.H. Devoret, S.M. Girvin, R.J. Schoelkopf}, title={Qubit-photon interactions in a cavity: Measurement-induced dephasing and number splitting}, journal={Phys. Rev. A}, year={2006}, volume={74}, number={4}, pages={042318}, document_type={Article}, local-url = {Gambetta2006.pdf}} @article{Abolfath2006636, Abstract = {We present a theory and Coulomb and spin blockade spectroscopy experiments on quantum Hall droplets with controlled electron numbers (N 1, N 2) in laterally coupled gated quantum dots. The theory is based on the configuration interaction method (CI) coupled with the unrestricted Hartree-Fock (URHF) basis. It allows us to calculate the magnetic field evolution of ground and excited states of coupled quantum dots with large electron numbers. The method is applied to the spin transitions in the (5, 5) droplet. Preliminary experimental results demonstrate the creation of the (5, 5) droplet and its spin blockade spectra. {\copyright} 2006 Elsevier B.V. All rights reserved.}, Author = {Abolfath, R.M. and Hawrylak, P. and Pioro-Ladriere, M. and Sachrajda, A.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1-2}, Pages = {636-639}, Source = {Scopus}, Title = {Quantum Hall droplets in coupled lateral quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33746447786&partnerID=40&md5=4b4268f25f2eb60f3c7476ec2d3747e4}, Volume = {34}, Year = {2006}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33746447786&partnerID=40&md5=4b4268f25f2eb60f3c7476ec2d3747e4}} @article{Byszewski2006239, Abstract = {In a high magnetic field, electrons confined to two dimensions form highly correlated states driven entirely by electron-electron interactions. Transport and cyclotron-resonance experiments on these fractional quantum Hall effect states, and the associated fractionally charged excitations, suggest the existence of composite fermions-electrons with two flux quanta attached. Using optical spectroscopy, we show that the two flux quanta in a composite fermion interacting with an exciton (a bound state of an electron and a hole) lead to filling-factor-dependent features in the optical emission spectrum, which are symmetric around filling factor v = 1/2, and fractionally charged excitations lead to fractionally charged excitons. In the vicinity of the incompressible v = 1/3 state we observe a doublet structure in the emission line, corresponding to excitations of the incompressible fluid. At filling factors v > 1/3, corresponding to the transition to a compressible metallic state, a new emission line appears, which we attribute to the fractionally charged quasi-exciton. {\copyright}2006 Nature Publishing Group.}, Author = {Byszewski, M. and Chwalisz, B. and Maude, D.K. and Sadowski, M.L. and Potemski, M. and Saku, T. and Hirayama, Y. and Studenikin, S. and Austing, D.G. and Sachrajda, A.S. and Hawrylak, P.}, Document_Type = {Article}, Journal = {Nature Physics}, Number = {4}, Pages = {239-243}, Source = {Scopus}, Title = {Optical probing of composite fermions in a two-dimensional electron gas}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33645785283&partnerID=40&md5=f46bdd6affd8d4a04c30aeca50a1ef2d}, Volume = {2}, Year = {2006}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33645785283&partnerID=40&md5=f46bdd6affd8d4a04c30aeca50a1ef2d}} @article{Pou06b, Abstract = {We consider the problem of optimally decoding a quantum error correction code --- that is to find the optimal recovery procedure given the outcomes of partial "check" measurements on the system. In general, this problem is NP-hard. However, we demonstrate that for concatenated block codes, the optimal decoding can be efficiently computed using a message passing algorithm. We compare the performance of the message passing algorithm to that of the widespread blockwise hard decoding technique. Our Monte Carlo results using the 5 qubit and Steane's code on a depolarizing channel demonstrate significant advantages of the message passing algorithms in two respects. 1) Optimal decoding increases by as much as 94% the error threshold below which the error correction procedure can be used to reliably send information over a noisy channel. 2) For noise levels below these thresholds, the probability of error after optimal decoding is suppressed at a significantly higher rate, leading to a substantial reduction of the error correction overhead.}, Author = {D. Poulin}, Date-Added = {2006-06-26 15:54:53 -0700}, Date-Modified = {2010-05-06 13:51:08 -0400}, Eprint = {quant-ph/0606126}, Journal = {Phys. Rev. A}, Keywords = {Error correction}, Local-Url = {Pou06b.pdf}, Pages = {052333}, Title = {Optimal and Efficient Decoding of Concatenated Quantum Block Codes}, Volume = {74}, Year = {2006}} @article{Pou06a, Abstract = {In the absence of an external frame of reference --- i.e. in background independent theories such as general relativity --- physical degrees of freedom must describe {em relations} between systems. Using a simple model, we investigate how such a relational quantum theory naturally arises by promoting reference systems to the status of dynamical entities. Our goal is twofold. First, we demonstrate using elementary quantum theory how any quantum mechanical experiment admits a purely relational description at a fundamental level. Second, we describe how the original "non-relational" theory approximately emerges from the fully relational theory when reference systems become semi-classical. Our technique is motivated by a Bayesian approach to quantum mechanics, and relies on the noiseless subsystem method of quantum information science used to protect quantum states against undesired noise. The relational theory naturally predicts a fundamental decoherence mechanism, so an arrow of time emerges from a time-symmetric theory. Moreover, our model circumvents the problem of the "collapse of the wave packet" as the probability interpretation is only ever applied to diagonal density operators. Finally, the physical states of the relational theory can be described in terms of "spin networks" introduced by Penrose as a combinatorial description of geometry, and widely studied in the loop formulation of quantum gravity. Thus, our simple bottom-up approach (starting from the semi-classical limit to derive the fully relational quantum theory) may offer interesting insights on the low energy limit of quantum gravity. }, Author = {David Poulin}, Date-Added = {2006-01-21 21:36:17 +1000}, Date-Modified = {2010-05-06 13:50:24 -0400}, Eprint = {quant-ph/0505081}, Journal = {Int. J. of Theor. Phys.}, Keywords = {Quantum Theory; Reference frame; Measurement; Gravity; Foundations}, Local-Url = {Pou06a.pdf}, Pages = {1229}, Title = {Toy model for a relational formulation of quantum theory}, Volume = {45}, Year = {2006}} @article{Gaudreau20063757, Abstract = {Recent developments in single and double electrostatically confined quantum dots have shown that these devices are promising candidates for the implementation of quantum computation schemes in solid state systems. One of the obstacles for such an accomplishment is scalability. We present here the first realization of a triple lateral quantum dot with a few number of electrons, going down to fundamental configurations such as the vacuum state (no electrons in the system) or one electron in each quantum dot. New phenomena unseen in single or double dots are revealed involving charge and spin reconfigurations within the system, reminiscent of quantum cellular automata (QCA) functionalities. More importantly, it is necessary to understand these phenomena for they will be present in any three or more coupled quantum dots system. An equivalent circuit analysis of the system is used to reproduce these new features and to highlight some differences between experiments and the model, possibly arising from quantum phenomena not included in the circuit analysis. {\copyright} 2006 WILEY-VCH Verlag GmbH & Co. KGaA.}, Author = {Gaudreau, L. and Sachrajda, A.S. and Studenikin, S. and Zawadzki, P. and Lapointe, J. and Kam, A.}, Document_Type = {Conference Paper}, Journal = {Physica Status Solidi (C) Current Topics in Solid State Physics}, Number = {11}, Pages = {3757-3761}, Source = {Scopus}, Title = {Equivalent circuit analysis of the stability diagram of a few electron triple quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-49549112070&partnerID=40&md5=ce73f88ea6ee52a1b4d55340617d6106}, Volume = {3}, Year = {2006}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-49549112070&partnerID=40&md5=ce73f88ea6ee52a1b4d55340617d6106}} @article{Gaudreau2006, Abstract = {Individual and coupled quantum dots containing one or two electrons have been realized and are regarded as components for future quantum information circuits. In this Letter we map out experimentally the stability diagram of the few-electron triple dot system, the electron configuration map as a function of the external tuning parameters, and reveal experimentally for the first time the existence of quadruple points, a signature of the three dots being in resonance. In the vicinity of these quadruple points we observe a duplication of charge transfer transitions related to charge and spin reconfigurations triggered by changes in the total electron occupation number. The experimental results are largely reproduced by equivalent circuit analysis and Hubbard models. Our results are relevant for future quantum mechanical engineering applications within both quantum information and quantum cellular automata architectures. {\copyright} 2006 The American Physical Society.}, Art_Number = {036807}, Author = {Gaudreau, L. and Studenikin, S.A. and Sachrajda, A.S. and Zawadzki, P. and Kam, A. and Lapointe, J. and Korkusinski, M. and Hawrylak, P.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {3}, Source = {Scopus}, Title = {Stability diagram of a few-electron triple dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33746255948&partnerID=40&md5=6d5d1d3d2c5bd69f33ad5c6440fa12db}, Volume = {97}, Year = {2006}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33746255948&partnerID=40&md5=6d5d1d3d2c5bd69f33ad5c6440fa12db}} @article{KLPL05a, Abstract = {This paper is an expanded and more detailed version of the work cite{KLP04} in which the Operator Quantum Error Correction formalism was introduced. This is a new scheme for the error correction of quantum operations that incorporates the known techniques --- i.e. the standard error correction model, the method of decoherence-free subspaces, and the noiseless subsystem method --- as special cases, and relies on a generalized mathematical framework for noiseless subsystems that applies to arbitrary quantum operations. We also discuss a number of examples and introduce the notion of "unitarily noiseless subsystems".}, Author = {Kribs, D. W. and Laflamme, R. and Poulin, D. and Lesosky, M.}, Date-Added = {2005-07-12 11:51:59 +1000}, Date-Modified = {2010-05-06 13:49:54 -0400}, Eprint = {quant-ph/0504189}, Journal = {Quant. Info. and Comp.}, Keywords = {Error correction; OQEC}, Local-Url = {KLPL05a.pdf}, Pages = {382}, Title = {Operator quantum error correction}, Volume = {6}, Year = {2006}} @article{Long2006553, Abstract = {We have studied at low temperatures the switching (telegraph) noise in quantum point contacts fabricated on GaAs/AlGaAs heterostructures and introduce a model for its origin which explains why the noise can be suppressed by cooling the samples with a positive bias applied to the gates. This model depends on there being a small tunnel current of electrons from gate to channel and we have detected such a current at the level of 10 - 20 A using a quantum corral fabricated on similar material. {\copyright} 2006 Elsevier B.V. All rights reserved.}, Author = {Long, A.R. and Pioro-Ladri{\`e}re, M. and Davies, J.H. and Sachrajda, A.S. and Gaudreau, L. and Zawadzki, P. and Lapointe, J. and Gupta, J. and Wasilewski, Z. and Studenikin, S.A.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1-2}, Pages = {553-556}, Source = {Scopus}, Title = {The origin of switching noise in GaAs/AlGaAs lateral gated devices}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33746656259&partnerID=40&md5=93aa62abadbbd61616ef41f18fb61782}, Volume = {34}, Year = {2006}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33746656259&partnerID=40&md5=93aa62abadbbd61616ef41f18fb61782}} @Article{PioroLadriere:2006p731, author = {M Pioro-Ladriere and A Usher and AS Sachrajda and J Lapointe and J Gupta and Z Wasilewski and S Studenikin and M Elliott}, journal = {Phys Rev B}, title = {Influence of the long-lived quantum Hall potential on the characteristics of quantum devices}, abstract = {Hysteretic effects are reported in magneto-transport experiments on lateral quantum devices. The effects are characterized by two vastly different relaxation times (minutes and days). It is shown that the observed phenomena are related to long-lived eddy currents. This is confirmed by torsion-balance magnetometry measurements of the same two-dimensional electron gas (2DEG) material. These observations show that the induced quantum Hall potential at the edges of the 2DEG reservoirs influences transport through the devices, and have important consequences for the transport properties of all lateral devices, subjected to quantizing magnetic fields.}, affiliation = {Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada}, number = {7}, pages = {075309}, volume = {73}, year = {2006}, month = {Jan}, language = {English}, keywords = {Coulomb, Eddy Currents, Integer, Blockade, Contactless Detection, Current Breakdown, Dot}, date-added = {2010-05-14 10:45:30 -0400}, date-modified = {2010-05-14 10:45:30 -0400}, doi = {10.1103/PhysRevB.73.075309}, pmid = {000235668900069}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p731}, rating = {0} } @article{MP06a, Abstract = {Using an elementary example based on two simple harmonic oscillators, we show how a relational time may be defined that leads to an approximate Schr{"o}dinger dynamics for subsystems, with corrections leading to an intrinsic decoherence in the energy eigenstates of the subsystem. }, Author = {Milburn, G. J. and Poulin, D.}, Date-Added = {2005-05-09 14:26:54 +1000}, Date-Modified = {2010-05-06 13:49:09 -0400}, Eprint = {quant-ph/050517}, Journal = {Int. J. Quant. Info.}, Keywords = {Reference frame; Quantum Theory; Gravity; Foundations}, Local-Url = {MP06a.pdf}, Pages = {151}, Title = {Relational time for systems of oscillators}, Volume = {4}, Year = {2006}} @article{Moreau2006203, Abstract = {We study the properties of high mobility GaAs/GaAlAs quantum well structure by monitoring the microwave induced changes in the low-temperature photoluminescence of the 2DEG as a function of the external magnetic field. The most pronounced changes are observed at cyclotron resonance conditions, but weak features are also visible at cyclotron resonance replicas. Possible observation of microwave induced shift in the Landau-level structure of magneto-photoluminescence is reported in addition to the effects of carrier heating which are conventionally bracketed together with microwave irradiation. {\copyright} 2006 Elsevier B.V. All rights reserved.}, Author = {Moreau, S. and Byszewski, M. and Sadowski, M.L. and Potemski, M. and Studenikin, S.A. and Austing, G. and Sachrajda, A.S. and Saku, T. and Hirayama, Y.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1-2 SPEC. ISS.}, Pages = {203-206}, Source = {Scopus}, Title = {Optically detected cyclotron resonance in a high mobility 2D electron gas}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33646481052&partnerID=40&md5=b5eab6e7e3b7b67f3e3a90751f14d3ba}, Volume = {32}, Year = {2006}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33646481052&partnerID=40&md5=b5eab6e7e3b7b67f3e3a90751f14d3ba}} @article{PioroLadriere2006, Abstract = {Hysteretic effects are reported in magneto-transport experiments on lateral quantum devices. The effects are characterized by two vastly different relaxation times (minutes and days). It is shown that the observed phenomena are related to long-lived eddy currents. This is confirmed by torsion-balance magnetometry measurements of the same two-dimensional electron gas (2DEG) material. These observations show that the induced quantum Hall potential at the edges of the 2DEG reservoirs influences transport through the devices, and have important consequences for the transport properties of all lateral devices, subjected to quantizing magnetic fields. {\copyright} 2006 The American Physical Society.}, Art_Number = {075309}, Author = {Pioro-Ladri{\`e}re, M. and Usher, A. and Sachrajda, A.S. and Lapointe, J. and Gupta, J. and Wasilewski, Z. and Studenikin, S. and Elliott, M.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {7}, Source = {Scopus}, Title = {Influence of the long-lived quantum Hall potential on the characteristics of quantum devices}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33144470474&partnerID=40&md5=94caf0b6c392d409aa98f2747061aa53}, Volume = {73}, Year = {2006}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33144470474&partnerID=40&md5=94caf0b6c392d409aa98f2747061aa53}} @conference{Studenikin2006871, Abstract = {We report the first experimental realization of a semiconductor triple quantum dot system in a few electrons regime. Charging properties of this "artificial tri-atom" are studied using non-invasive charge detection technique. The most fundamental configuration was initialized in which a single electron is shared resonantly between the three dots and also equivalent arrangements involving two or three electrons. Using gates we are able to tune through the quadruple points, a unique feature of triple dot systems. At a quadruple point the quantum states in all three dots resonantly coincide with each other and with the chemical potential of the leads. Unexpectedly, novel charge re-arrangement lines were observed in vicinity of quadruple points. The observed charge re-arrangement can be viewed as a basic realization of quantum cellular automata in the few electron regime. Such phenomenon may be expected for all multiple quantum dot systems greater than two, in which a change in the state of one dot may instantaneously trigger a charge rearrangement of the system. The results may lead to new opportunities for fundamental physics research and for other applications, e.g. quantum computing. {\copyright} 2006 Crown Copyright.}, Art_Number = {1717248}, Author = {Studenikin, S. and Gaudreau, L. and Sachrajda, A. and Zawadzki, P. and Kam, A. and Lapointe, J. and Korkusinski, M. and Hawrylak, P.}, Document_Type = {Conference Paper}, Journal = {2006 6th IEEE Conference on Nanotechnology, IEEE-NANO 2006}, Pages = {871-874}, Source = {Scopus}, Title = {Charging characteristics of a few electron triple lateral quantum dot system in GaAs/AlGaAs}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-42549128704&partnerID=40&md5=80e69dd9c66fe7780e294c3988b83340}, Volume = {2}, Year = {2006}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-42549128704&partnerID=40&md5=80e69dd9c66fe7780e294c3988b83340}} @article{Studenikin200673, Abstract = {Microwave induced resistance oscillations (MIROs) were studied experimentally over a very wide range of frequencies ranging from ∼20 GHz up to ∼4 THz, and from the quasi-classical regime to the quantum Hall effect regime. At low frequencies regular MIROs were observed, with a periodicity determined by the ratio of the microwave to cyclotron frequencies. For frequencies below 150 GHz the magnetic field dependence of MIROs waveform is well described by a simplified version of an existing theoretical model, where the damping is controlled by the width of the Landau levels. In the THz frequency range MIROs vanish and only pronounced resistance changes are observed at the cyclotron resonance. The evolution of MIROs with frequency is presented and discussed. {\copyright} 2006 Elsevier B.V. All rights reserved.}, Author = {Studenikin, S.A. and Byszewski, M. and Maude, D.K. and Potemski, M. and Sachrajda, A. and Wasilewski, Z.R. and Hilke, M. and Pfeiffer, L.N. and West, K.W.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1-2}, Pages = {73-76}, Source = {Scopus}, Title = {The microwave induced resistance response of a high mobility 2DEG from the quasi-classical limit to the quantum Hall regime}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33746385835&partnerID=40&md5=95134d7ac2aff65a36e7e3e6be940bb3}, Volume = {34}, Year = {2006}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33746385835&partnerID=40&md5=95134d7ac2aff65a36e7e3e6be940bb3}} @ARTICLE{Wallraff20051, author={ A. Wallraff, D.I. Schuster, A. Blais, L. Frunzio, J. Majer, M.H. Devoret, S.M. Girvin, R.J. Schoelkopf}, title={Approaching unit visibility for control of a superconducting qubit with dispersive readout}, journal={Phys. Rev. Lett.}, year={2005}, volume={95}, number={6}, pages={1-4}, pages={060501}, document_type={Article}, local-url = {Wallraff20051.pdf}} @ARTICLE{Rigetti20051, author={ C. Rigetti, A. Blais, M. Devoret}, title={Protocol for universal gates in optimally biased superconducting qubits}, journal={Phys. Rev. Lett.}, year={2005}, volume={94}, number={24}, pages={1-4}, pages={240502}, document_type={Article}, local-url = {Rigetti20051.pdf}} @ARTICLE{Schuster2005, author={ D.I. Schuster, A. Wallraff, A. Blais, L. Frunzio, R.-S. Huang, J. Majer, S.M. Girvin, R.J. Schoelkopf}, title={AC Stark shift and dephasing of a superconducting qubit strongly coupled to a cavity field}, journal={Phys. Rev. Lett.}, year={2005}, volume={94}, number={12}, pages={123602}, document_type={Article}, local-url = {Schuster2005.pdf}} @article{Reulet2005LXX, Year = {2005}, Abstract = {}, title = {Higher Moments of Noise}, author = {B. Reulet}, journal = {Les Houches Summer School of Theoretical Physics, Session LXXXI, Nanophysics: Coherence and Transport, NATO ASI. H. Bouchiat, Y. Gefen, S. Guéron, G. Montambaux and J. Dalibard editors. Elsevier; (cond-mat/0502077)}} @article{REP+05a, Abstract = {We present experimental results on the measurement of fidelity decay under contrasting system dynamics using a nuclear magnetic resonance quantum information processor. The measurements were performed by implementing a scalable circuit in the model of deterministic quantum computation with only one quantum bit. The results show measurable differences between regular and complex behaviour and for complex dynamics are faithful to the expected theoretical decay rate. Moreover, we illustrate how the experimental method can be seen as an efficient way for either extracting coarse-grained information about the dynamics of a large system, or measuring the decoherence rate from engineered environments.}, Author = {C. A. Ryan and J. Emerson and D. Poulin and C. Negrevergne and R. Laflamme}, Date-Added = {2006-01-06 10:48:26 +1000}, Date-Modified = {2010-05-06 13:55:20 -0400}, Eid = {250502}, Journal = {Phys. Rev. Lett.}, Keywords = {Quantum chaos; Quantum simulation}, Local-Url = {REP+05a.pdf}, Number = {25}, Numpages = {4}, Pages = {250502}, Publisher = {APS}, Title = {Characterization of Complex Quantum Dynamics with a Scalable NMR Information Processor}, Url = {http://link.aps.org/abstract/PRL/v95/e250502}, Volume = {95}, Year = {2005}} @misc{PT05a, Abstract = {We comment on a recent paper by D'Abramo [Chaos, Solitons \& Fractals, 25 (2005) 29], focusing on the author's statement that an algorithm can produce a list of strings containing at least one string whose algorithmic complexity is greater than that of the entire list. We show that this statement, although perplexing, is not as paradoxical as it seems when the definition of algorithmic complexity is applied correctly.}, Author = {David Poulin and Hugo Touchette}, Date-Added = {2006-01-06 10:50:01 +1000}, Date-Modified = {2010-05-06 13:56:21 -0400}, Eprint = {cs.OH/0503034}, Local-Url = {PT05a.pdf}, Title = {Comment on ``Some non-conventional idesa about algorithmic complexity"}, Year = {2005}} @conference{Evaldsson20051413, Abstract = {We demonstrate that the magnetoconductance of small lateral quantum dots in the strongly-coupled regime (i.e. when the leads can support one or more propagating modes) shows a pronounced splitting of the conductance peaks and dips which persists over a wide range of magnetic fields (from zero field to the edge-state regime) and is virtually independent of the magnetic field strength. Our numerical analysis of the conductance based on the Hubbard Hamiltonian demonstrates that this is essentially a many-body/spin effect that can be traced to a splitting of degenerate levels in the corresponding closed dot. The above effect in open dots can be regarded as a counterpart of the Coulomb blockade effect in weakly coupled dots, with the difference, however, that the splitting of the peaks originates from the interaction between the electrons of opposite spin. {\copyright} 2005 American Institute of Physics.}, Author = {Evaldsson, M. and Zozoulenko, I.V. and Ciorga, M. and Zawadzki, P. and Sachrajda, A.S.}, Document_Type = {Conference Paper}, Journal = {AIP Conference Proceedings}, Pages = {1413-1414}, Source = {Scopus}, Title = {Spin splitting in open quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33749495753&partnerID=40&md5=d725e91f91c29c1642c316ee8270c684}, Volume = {772}, Year = {2005}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33749495753&partnerID=40&md5=d725e91f91c29c1642c316ee8270c684}} @article{Hawrylak2005, Author = {Hawrylak, P. and Lockwood, D.J. and Sachrajda, A.S. and Austing, D.G.}, Document_Type = {Conference Paper}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1-4}, Pages = {vii-viii}, Source = {Scopus}, Title = {Physica E: Low-Dimensional Systems and Nanostructures - Preface}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-13444292241&partnerID=40&md5=8aee47279ebea3827ce0915b9c09a4d8}, Volume = {26}, Year = {2005}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-13444292241&partnerID=40&md5=8aee47279ebea3827ce0915b9c09a4d8}} @article{Kim20051, Abstract = {Photoluminescence measurements in magnetic fields up to 16 T are reported from single InAsInP quantum dots nucleated at the apex of individual InP pyramidal nanotemplates. Clear Zeeman splitting and diamagnetic shifts of the s -shell exciton peak are observed and are correlated with the quantum-dot dimension. This behavior is interpreted in terms of a template-controlled quantum-dot diameter and is corroborated by the observed diamagnetic shifts. {\copyright} 2005 American Institute of Physics.}, Art_Number = {212105}, Author = {Kim, D. and Lefebvre, J. and McKee, J. and Studenikin, S. and Williams, R.L. and Sachrajda, A. and Zawadzki, P. and Hawrylak, P. and Sheng, W. and Aers, G.C. and Poole, P.J.}, Document_Type = {Article}, Journal = {Applied Physics Letters}, Number = {21}, Pages = {1-3}, Source = {Scopus}, Title = {Photoluminescence of single, site-selected, InAs/InP quantum dots in high magnetic fields}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-27844593453&partnerID=40&md5=2773192eb4e1d0644e8f3bff402de6ad}, Volume = {87}, Year = {2005}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-27844593453&partnerID=40&md5=2773192eb4e1d0644e8f3bff402de6ad}} @article{KLP05a, Abstract = {We present a unified approach to quantum error correction, called operator quantum error correction. Our scheme relies on a generalized notion of noiseless subsystem that is investigated here. By combining active error correction with this generalized noiseless subsystems method, we arrive at the unified approach which incorporates the known techniques --- i.e. the standard error correction model, the method of decoherence-free subspaces, and the noiseless subsystem method --- as special cases. Moreover, we demonstrate that the quantum error correction condition from the standard model is a necessary condition for all known methods of quantum error correction.}, Author = {Kribs, D. and Laflamme, R. and Poulin, D.}, Date-Added = {2005-05-06 15:11:09 +1000}, Date-Modified = {2010-05-06 13:54:07 -0400}, Eprint = {quant-ph/0412076}, Journal = {Phys. Rev. Lett.}, Keywords = {Error correction; OQEC}, Local-Url = {KLP05a.pdf}, Pages = {180501}, Title = {A Unified and Generalized Approach to Quantum Error Correction}, Volume = {94}, Year = {2005}} @Article{PioroLadriere:2005p724, author = {M Pioro-Ladriere and JH Davies and AR Long and AS Sachrajda and L Gaudreau and P Zawadzki and J Lapointe and J Gupta and Z Wasilewski and S Studenikin}, journal = {Phys Rev B}, title = {Origin of switching noise in GaAs/AlxGa1-xAs lateral gated devices}, abstract = {We have studied switching (telegraph) noise at low temperature in GaAs/AlxGa1-xAs heterostructures with lateral gates and introduced a model for its origin, which explains why noise can be suppressed by cooling samples with a positive bias on the gates. The noise was measured by monitoring the conductance fluctuations around e(2)/h on the first step of a quantum point contact at around 1.2 K. Cooling with a positive bias on the gates dramatically reduces this noise, while an asymmetric bias exacerbates it. Our model is that the noise originates from a leakage current of electrons that tunnel through the Schottky barrier under the gate into the conduction band and become trapped near the active region of the device. The key to reducing noise is to keep the barrier opaque under experimental conditions. Cooling with a positive bias on the gates reduces the density of ionized donors. This builds in an effective negative gate voltage so that a smaller negative bias is needed to reach the desired operating point. This suppresses tunneling from the gate and hence the noise. The reduction in the density of ionized donors also strengthens the barrier to tunneling at a given applied voltage. Further support for the model comes from our direct observation of the leakage current into a closed quantum dot, around 10(-20) A for this device. The current was detected by a neighboring quantum point contact, which showed monotonic steps in time associated with the tunneling of single electrons into the dot. If asymmetric gate voltages are applied, our model suggests that the noise will increase as a consequence of the more negative gate voltage applied to one of the gates to maintain the same device conductance. We observe exactly this behavior in our experiments.}, affiliation = {Univ Glasgow, Dept Elect {\&} Elect Engn, Glasgow G12 8QQ, Lanark, Scotland}, number = {11}, pages = {115331}, volume = {72}, year = {2005}, month = {Jan}, language = {English}, keywords = {Low-Frequency Noise, Quantum Point Contacts, Transport, Scattering}, date-added = {2010-05-14 10:37:29 -0400}, date-modified = {2010-05-14 10:37:29 -0400}, doi = {10.1103/PhysRevB.72.115331}, pmid = {000232229100112}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p724}, rating = {0} } @Article{PioroLadriere:2005p723, author = {M Pioro-Ladriere and MR Abolfath and P Zawadzki and J Lapointe and SA Studenikin and AS Sachrajda and P Hawrylak}, journal = {Phys Rev B}, title = {Charge sensing of an artificial H-2(+) molecule in lateral quantum dots}, abstract = {We report charge detection studies of a lateral double quantum dot with controllable charge states and tunable tunnel coupling. Using an integrated electrometer, we characterize the equilibrium state of a single electron trapped in the double-dot (artificial H-2(+) molecule) by measuring the average occupation of one dot. We present a model where the electrostatic coupling between the molecule and the sensor is taken into account explicitly. From the measurements, we extract the temperature of the isolated electron and the tunnel coupling energy. It is found that this coupling can be tuned between 0 and 60 mu eV in our device.}, affiliation = {Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada}, number = {12}, pages = {125307}, volume = {72}, year = {2005}, month = {Jan}, language = {English}, keywords = {Coulomb-Blockade, Atoms, Spin}, date-added = {2010-05-14 10:37:33 -0400}, date-modified = {2010-05-14 10:37:33 -0400}, doi = {10.1103/PhysRevB.72.125307}, pmid = {000232229400073}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p723}, rating = {0} } @article{OPZ05a, Abstract = {We study the role of the information deposited in the environment of an open quantum system in course of the decoherence process. Redundant spreading of information --- the fact that some observables of the system can be independently "read-off" from many distinct fragments of the environment --- is investigated as the key to effective objectivity, the essential ingredient of "classical reality". This focus on the environment as a communication channel through which observers learn about physical systems underscores importance of quantum Darwinism --- selective proliferation of information about "the fittest states" chosen by the dynamics of decoherence at the expense of their superpositions --- as redundancy imposes the existence of preferred observables. We demonstrate that the only observables that can leave multiple imprints in the environment are the familiar pointer observables singled out by environment-induced superselection (einselection) for their predictability. Many independent observers monitoring the environment will therefore agree on properties of the system as they can only learn about preferred observables. In this operational sense, the selective spreading of information leads to appearance of an objective "classical reality" from within quantum substrate.}, Author = {Ollivier, H. and Poulin, D. and Zurek, W. H.}, Correct_Ref = {Yes}, Date-Modified = {2010-05-06 13:53:18 -0400}, Eprint = {quant-ph/0408125}, Journal = {Phys. Rev. A}, Keywords = {Decoherence; Quantum Theory; Foundations}, Local-Url = {OPZ05a.pdf}, Pages = {042113}, Read = {Yes}, Source = {H. Ollivier}, Title = {Environment as a Witness: Selective Proliferation of Information and Emergence of Objectivity}, Url = {http://www.arxiv.org/abs/quant-ph/0408125}, Volume = {72}, Year = {2005}} @article{Pou05a, Abstract = {We study macroscopic observables defined as the total value of a physical quantity over a collection of quantum systems. We show that previous results obtained for infinite ensemble of identically prepared systems lead to incorrect conclusions for finite ensembles. In particular, exact measurement of a macroscopic observable significantly disturbs the state of any finite ensemble. However, we show how this disturbance can be made arbitrarily small when the measurement are of finite accuracy. We demonstrate a general tradeoff between state disturbance and measurement coarseness as a function of the size of the ensemble. Using this tradeoff, we show that the histories generated by any sequence of finite accuracy macroscopic measurements always generate a consistent family in the absence of large scale entanglement, for sufficiently large ensembles. Hence, macroscopic observables behave "classically" provided that their accuracy is coarser than the quantum correlation length-scale of the system. The role of these observable is also discussed in the context of NMR quantum information processing and bulk ensemble quantum state tomography. }, Author = {Poulin, D.}, Date-Modified = {2010-05-06 13:52:38 -0400}, Eprint = {quant-ph/0403212}, Journal = {Phys. Rev. A}, Keywords = {Quantum Theory; Emergent; Decoherence; Renormalization; Foundations}, Local-Url = {Pou05a.pdf}, Pages = {22102}, Title = {Macroscopic Observables}, Volume = {71}, Year = {2005}} @article{Pou05b, Abstract = {Operator quantum error correction is a recently developed theory that provides a generalized framework for active error correction and passive error avoiding schemes. In this paper, we describe these codes in the stabilizer formalism of standard quantum error correction theory. This is achieved by adding a "gauge" group to the standard stabilizer definition of a code that defines an equivalence class between encoded states. Gauge transformations leave the encoded information unchanged; their effect is absorbed by virtual gauge qubits that do not carry useful information. We illustrate the construction by identifying a gauge symmetry in Shor's 9-qubit code that allows us to remove 4 of its 8 stabilizer generators, leading to a simpler decoding procedure and a wider class of logical operations without affecting its essential properties. This opens the path to possible improvements of the error threshold of fault-tolerant quantum computing. }, Author = {Poulin, D.}, Date-Added = {2005-10-11 08:24:34 +1000}, Date-Modified = {2010-05-06 13:51:53 -0400}, Eprint = {quant-ph/0508131}, Journal = {Phys. Rev. Lett.}, Keywords = {Error correction; OQEC}, Local-Url = {Pou05b.pdf}, Pages = {230504}, Title = {Stabilizer formalism for operator quantum error correction}, Volume = {95}, Year = {2005}} @conference{Raymond200523, Abstract = {Charge-neutral droplets of electrons and holes in Quantum Dots (QDs) are probed optically. The application of strong magnetic fields creates a typical pattern of levels shifting and crossing, which closely resembles that of a single particle Fock-Darwin (F-D) spectrum. We show that the relevant particle in this context is an exciton whose behavior is dominated by the single particle character of both electron and hole due to the wavefunction symmetry in the QDs. However, precise quantitative analysis can be performed introducing many-body effects where direct Coulomb interaction, exchange energy and configuration coupling contribute to renormalization of the emission energies and alteration of the F-D spectra. Wavefunction symmetry plays a role in imposing quasi-degenerate transitions at specific magnetic fields whereby hybridization of states with opposing magnetic field dependence creates a cancellation of the level shifting for a limited range of magnetic fields.}, Author = {Raymond, S. and Studenikin, S. and Sachrajda, A. and Wasilewski, Z. and Cheng, S.J. and Sheng, W. and Hawrylak, P. and Babinski, A. and Potemski, M. and Ortner, G. and Bayer, M.}, Document_Type = {Conference Paper}, Journal = {Proceedings - Electrochemical Society}, Pages = {23-38}, Source = {Scopus}, Title = {Excitonic fock-darwin spectra from electron-hole droplets in self-assembled quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-28544435616&partnerID=40&md5=bc041fc566863f80e7530563ff1c65dd}, Volume = {PV 2004-13}, Year = {2005}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-28544435616&partnerID=40&md5=bc041fc566863f80e7530563ff1c65dd}} @ARTICLE{Reulet20051, author = {Reulet, B., Prober, D.E.}, title = {The noise thermal impedance of a diffusive wire}, journal = {Physical Review Letters}, year = {2005}, volume = {95, 066602}, number = {6}, pages = {1-4}, art_number = {066602}, note = {cited By (since 1996) 8}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-27144546392&partnerID = 40&md5 = a87079b345a702fd2ec0f712e0dbedd5}, affiliation = {Departments of Applied Physics and Physics, Yale University, New Haven, CT 06520-8284, United States; Laboratoire de Physique des Solides, UMR8502, Université Paris-Sud, 91405 Orsay, France}, abstract = {The current noise density S2 of a conductor in equilibrium, the Johnson noise, is determined by its temperature T: S2 = 4kBTG, with G the conductance. The sample's noise temperature TN = S2/(4kBG) generalizes T for a system out of equilibrium. We introduce the "noise thermal impedance" of a sample as the ratio δTNω/δPJω of the amplitude δTNω of the oscillation of TN when heated by an oscillating power δPJω at frequency ω. For a macroscopic sample, it is the usual thermal impedance. We show for a diffusive wire how this (complex) frequency-dependent quantity gives access to the electron-phonon interaction time in a long wire and to the diffusion time in a shorter one, and how its real part may also give access to the electron-electron inelastic time. These times are not simply accessible from the frequency dependence of S2 itself. 2005 The American Physical Society.}, document_type = {Article}, source = {Scopus}} @conference{Sachrajda20051303, Abstract = {Two transport techniques are described for performing charge redistribution spectroscopy at a fixed electron number. In the first method we simply apply the well established 'Cambridge' QPC charge detector technique to a dot with no leads to external reservoirs. In the second technique we use two dots in series in the regime where the electrochemical potential of only one of the dots is aligned with the external leads. In this case the transport involves co-tunneling processes through the second dot. Charge rearrangements occurring in one dot are picked up through shifts in the electrochemical potential of the other. We perform proof of concept demonstrations using well characterised transitions in the vicinity of filling factor 2 to confirm that both techniques can be used for charge redistribution spectroscopy. We discuss why such spectroscopy can provide new information about complex many-body spin phenomena in quantum dots. {\copyright} 2005 American Institute of Physics.}, Author = {Sachrajda, A.S. and Pioro-Ladri{\`e}re, M. and Ciorga, M. and Studenikin, S. and Zawadzki, P. and Hawrylak, P. and Lapointe, J. and Wasilewski, Z.R. and Gupta, J.A.}, Document_Type = {Conference Paper}, Journal = {AIP Conference Proceedings}, Pages = {1303-1306}, Source = {Scopus}, Title = {Charge redistribution spectroscopy as a probe of spin phenomena in quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33749513749&partnerID=40&md5=dbb33294e42a9a3568f29367f824c3ff}, Volume = {772}, Year = {2005}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33749513749&partnerID=40&md5=dbb33294e42a9a3568f29367f824c3ff}} @article{Stomp2005, Abstract = {Single-electron charging in an individual InAs quantum dot was observed by electrostatic force measurements with an atomic-force microscope (AFM). The resonant frequency shift and the dissipated energy of an oscillating AFM cantilever were measured as a function of the tip-back electrode voltage, and the resulting spectra show distinct jumps when the tip was positioned above the dot. The observed jumps in the frequency shift, with corresponding peaks in dissipation, are attributed to a single-electron tunneling between the dot and the back electrode governed by the Coulomb blockade effect, and are consistent with a model based on the free energy of the system. The observed phenomenon may be regarded as the "force version" of the Coulomb blockade effect. {\copyright} 2005 The American Physical Society.}, Art_Number = {056802}, Author = {Stomp, R. and Miyahara, Y. and Schaer, S. and Sun, Q. and Guo, H. and Grutter, P. and Studenikin, S. and Poole, P. and Sachrajda, A.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {5}, Source = {Scopus}, Title = {Detection of single-electron charging in an individual InAs quantum dot by noncontact atomic-force microscopy}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-18144384191&partnerID=40&md5=493d02c2bdada6f46d2a52dce5b6315f}, Volume = {94}, Year = {2005}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-18144384191&partnerID=40&md5=493d02c2bdada6f46d2a52dce5b6315f}} @article{Studenikin2005, Abstract = {In this work we address experimentally a number of unresolved issues related to microwave induced resistance oscillations (MIROs) leading to the zero-resistance states observed recently on 2D electron gases in GaAs AlGaAs heterostructures. We stress the importance of the electrodynamic effects detected in both reflection and absorption experiments, although they are not revealed in transport experiments on very high mobility samples. We also study the exact waveform of MIROs and their damping due to temperature. A simple equation is given, which can be considered as phenomenological, which describes precisely the experimental MIROs waveform. The waveform depends only on a single parameter-the width of the Landau levels, which is related to the quantum lifetime. A very good correlation was found between the temperature dependencies of the quantum lifetime from MIROs and the transport scattering time from the electron mobility with a ratio τtr τq 20. It is found that the prefactor in the equation for MIROs decays as 1 T2 with the temperature which can be explained within the distribution function model suggested by Dmitriev. The results are compared with measurements of the Shubnikov-de Haas oscillations down to 30mK on the same sample. {\copyright} 2005 The American Physical Society.}, Art_Number = {245313}, Author = {Studenikin, S.A. and Potemski, M. and Sachrajda, A. and Hilke, M. and Pfeiffer, L.N. and West, K.W.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {24}, Source = {Scopus}, Title = {Microwave-induced resistance oscillations on a high-mobility two-dimensional electron gas: Exact waveform, absorption/reflection and temperature damping}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-28244461968&partnerID=40&md5=8ee75db79d829c32eb4d3d3651d77f0c}, Volume = {71}, Year = {2005}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-28244461968&partnerID=40&md5=8ee75db79d829c32eb4d3d3651d77f0c}} @article{Studenikin2005124, Abstract = {We have performed simultaneous measurements of microwave absorption/reflection and magneto-transport characteristics of a high-mobility two-dimensional electrons in GaAs-AlGaAs heterostructure in the regime of microwave-induced resistance oscillations (MIROs). It is shown that the electrodynamic aspect of the problem is important in these experiments. In the absorption experiments, a broad cyclotron resonance line was observed due to a large reflection from the highly conductive electron gas. There were no additional features observed related to absorption at harmonics of the cyclotron resonance. In near-field reflection experiments, a very different oscillation pattern was revealed when compared to MIROs. The oscillation pattern observed in the reflection experiments is probably due to plasma effects occurring in a finite-size sample. The whole microscopic picture of MIROs is more complicated than simply a resonant absorption at harmonics of the cyclotron resonance. Nevertheless, the experimental observations are in good agreement with the model by Ryzhii et al. involving the photo-assisted scattering in the presence of a crossed magnetic field and dc bias. The observed damping factor of MIROs may be attributed to a change in the electron mobility as a function of temperature.}, Author = {Studenikin, S.A. and Potemski, M. and Sachrajda, A.S. and Hilke, M. and Pfeiffer, L.N. and West, K.W.}, Document_Type = {Conference Paper}, Journal = {IEEE Transactions on Nanotechnology}, Number = {1}, Pages = {124-130}, Source = {Scopus}, Title = {Microwave absorption/reflection and magneto-transport experiments on high-mobility electron gas}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-12844250096&partnerID=40&md5=36eb510c681f85d9965634df40d61bc7}, Volume = {4}, Year = {2005}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-12844250096&partnerID=40&md5=36eb510c681f85d9965634df40d61bc7}} @ARTICLE{Blais2004062320, author={ A. Blais, R.-S. Huang, A. Wallraff, S.M. Girvin, R.J. Schoelkopf}, title={Cavity quantum electrodynamics for superconducting electrical circuits: An architecture for quantum computation}, journal={Phys. Rev. A}, year={2004}, volume={69}, number={6}, pages={062320-1}, document_type={Article}, local-url = {Blais2004062320.pdf}} @ARTICLE{Wallraff2004162, author={ A. Wallraff, D.I. Schuster, A. Blais, L. Frunzio, R.-S. Huang, J. Majer, S. Kumar, S.M. Girvin, R.J. Schoelkopf}, title={Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics}, journal={Nature}, year={2004}, volume={431}, number={7005}, pages={162-167}, document_type={Article}, local-url = {Wallraff2004162.pdf}} @ARTICLE{Girvin2004591, author={ S.M. Girvin, R.-S. Huang, A. Blais, A. Wallraff, R.J. Schoelkopf}, title={Course 16 Prospects for strong cavity quantum electrodynamics with superconducting circuits}, journal={Les Houches Summer School Proceedings}, year={2004}, volume={79}, number={C}, pages={591-608}, document_type={Article}, local-url = {Girvin2004591.pdf}} @Article{Sachrajda:2004p730, author = {A. S Sachrajda and M Korkusinski and P Hawrylak and M Ciorga and M Pioro-Ladriere and P Zawadzki}, journal = {J Magn Magn Mater}, title = {Spin textures in few electron quantum dots}, abstract = {In this paper, we comment on the detection of spin textures by Coulomb and spin blockade in few electron lateral dots. These correlated states occur as brief spin depolarization interludes during the spin polarization of a quantum dot with a magnetic field. These states are found to possess unusual characteristics in both current stripes and Coulomb diamonds. The same features are found both in the complicated regime of the last spin flip and for the simple case of the second spin flip. (C) 2003 Elsevier B.V. All rights reserved.}, affiliation = {Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada}, pages = {E1273--E1274}, volume = {272}, year = {2004}, month = {Jan}, language = {English}, keywords = {Spin Textures, Spin Blockade}, date-added = {2010-05-14 10:37:39 -0400}, date-modified = {2010-05-14 10:37:39 -0400}, doi = {10.1016/j.jmmm.2003.12.306}, pmid = {000202897200500}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p730}, rating = {0} } @article{Awirothananon20042088, Abstract = {A set of self-assembled InAs/GaAs quantum dot (QD) samples annealed at various temperatures for 30 s was studied using magneto-photoluminescence up to 28 T. Blueshifts increasing with annealing temperature, due to Ga-As interchange at the QD-barrier interface, are correlated with a reduction in inhomogeneous broadening and a reduction in inter-sublevel spacing. These new sample properties allow us to obtain clear crossing patterns closely matched with Fock-Darwin diagrams where the field applied perpendicular to the QD plane lifts the state degeneracies. In the limit that in-plane electron and hole wavefunction extension is the same, the splitting of the p-shell with magnetic field is inversely proportional to the in-plane exciton reduced mass. We use this to obtain the evolution of the latter with intermixing, and compare with predictions of single-particle k * p calculations.}, Author = {Awirothananon, S. and Sheng, W.D. and Babinski, A. and Studenikin, S. and Raymond, S. and Sachrajda, A. and Potemski, M. and Fafard, S. and Ortner, G. and Bayer, M.}, Document_Type = {Conference Paper}, Journal = {Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers}, Number = {4 B}, Pages = {2088-2092}, Source = {Scopus}, Title = {Electronic and structural properties of interdiffused self-assembled quantum dots from magneto-photoluminescence}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-17144440020&partnerID=40&md5=e133d55f2a496e52247d2135a36216e0}, Volume = {43}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-17144440020&partnerID=40&md5=e133d55f2a496e52247d2135a36216e0}} @article{Reulet2004XXX, Year = {2004}, Abstract = {}, title = {Measurement of non-Gaussian shot noise: influence of the environment}, author = {B. Reulet, J. Senzier, L. Spietz, C.M. Wilson and D.E. Prober}, journal = {Proceedings of the XXXIXth Rencontres de Moriond Quantum Information and Decoherence in Nanosystems, La Thuile, Italy. D.C. Glattli, M. Sanquer and J. Trân Thanh Vân editors. The Gioi Publishers}} @article{Babinski2004603, Abstract = {Results of photoluminescence excitation (PLE) measurements of quantum dots (QDs) in high magnetic field are presented in this work. A structure with a single layer of InAs/GaAs QDs of a relatively small inter-level spacing and inhomogeneous broadening has been investigated at T=4.2 K in magnetic field up to 28 T. It has been found that the PLE spectrum at zero magnetic field, with detection energy set at the ground state (s-shell) of the QDs, is dominated by two features. These have been attributed to absorption in the QDs p- and d-shell, respectively. The peaks split in magnetic field following the pattern of the Fock-Darwin potential and features, attributed to the lowest Landau level in the QDs can be observed in high magnetic field. {\copyright} 2003 Elsevier B.V. All rights reserved.}, Author = {Babinski, A. and Awirothananon, S. and Raymond, S. and Studenikin, S. and Hawrylak, P. and Cheng, S.-J. and Sheng, W. and Wasilewski, Z. and Potemski, M. and Sachrajda, A.}, Document_Type = {Conference Paper}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1-3}, Pages = {603-606}, Source = {Scopus}, Title = {Photoluminescence excitation spectroscopy of InAs/GaAs quantum dots in high magnetic field}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-11144354338&partnerID=40&md5=b8feaf74e9f0653d786031037ab99db4}, Volume = {22}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-11144354338&partnerID=40&md5=b8feaf74e9f0653d786031037ab99db4}} @article{BGL+04a, Abstract = {We present two polarization-based protocols for quantum key distribution. The protocols encode key bits in noiseless subspaces or subsystems, and so can function over a quantum channel subjected to an arbitrary degree of collective noise, as occurs, for instance, due to rotation of polarizations in an optical fiber. These protocols can be implemented using only entangled photon-pair sources, single-photon rotations, and single-photon detectors. Thus, our proposals offer practical and realistic alternatives to existing schemes for quantum key distribution over optical fibers without resorting to interferometry or two-way quantum communication, thereby circumventing, respectively, the need for high precision timing and the threat of Trojan horse attacks.}, Author = {Boileau, J.-C. and Gottesman, D. and Laflamme, R. and Poulin, D. and Spekkens, R. W.}, Date-Modified = {2010-05-06 14:02:43 -0400}, Eprint = {quant-ph/0306199}, Journal = {Phys. Rev. Lett.}, Keywords = {Crypto; Error correction}, Local-Url = {BGL+04a.pdf}, Pages = {017901}, Title = {Robust Polarization-Based Quantum Key Distribution over a Collective-Noise Channel}, Volume = {92}, Year = {2004}} @article{Byszewski2004652, Abstract = {We report optical investigations of Mn2+ spin resonance in (Cd,Mn)Te dilute magnetic semiconductor quantum wells. Raman scattering spin-flip measurements and optically detected magnetic resonance were performed on these samples. Both methods show features suggestive of Mn ion correlations - multiple Raman spin flips are observed in both Faraday and Voigt configurations. An unexpected multiplet of hyperfine split lines is also observed in the magnetic resonance spectra. {\copyright} 2003 Elsevier B.V. All rights reserved.}, Author = {Byszewski, M. and Plantier, D. and Sadowski, M.L. and Potemski, M. and Sachrajda, A. and Wilamowski, Z. and Karczewski, G.}, Document_Type = {Conference Paper}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1-3}, Pages = {652-655}, Source = {Scopus}, Title = {Optical studies of Mn2+ spin resonance in (Cd,Mn)Te quantum wells}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-1842733851&partnerID=40&md5=86bd4c76c31c20a67165894a6305f413}, Volume = {22}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-1842733851&partnerID=40&md5=86bd4c76c31c20a67165894a6305f413}} @article{Cheng2004211, Abstract = {We present results of calculations and experiments on electron-hole complexes in InGaAs/GaAs self-assembled quantum dots in high magnetic field (B). Due to hidden symmetries, the chemical potential of an N-exciton system at special B fields becomes insensitive to the exciton number as well as the magnetic field. This results in plateau regions of high intensity in measured magneto-PL spectrum. Theoretical calculations using exact diagonalization techniques successfully explain the measured magneto-photoluminescence spectrum with B fields up to 28 T. {\copyright} 2003 Elsevier B.V. All rights reserved.}, Author = {Cheng, S.J. and Sheng, W. and Hawrylak, P. and Raymond, S. and Studenikin, S. and Sachrajda, A. and Wasilewski, Z. and Babinski, A. and Potemski, M. and Ortner, G. and Bayer, M.}, Document_Type = {Conference Paper}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {2-4}, Pages = {211-214}, Source = {Scopus}, Title = {Electron-hole complexes in self-assembled quantum dots in strong magnetic fields}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-12144291359&partnerID=40&md5=08835c4e1a75a54a1a2d9e3bf563889d}, Volume = {21}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-12144291359&partnerID=40&md5=08835c4e1a75a54a1a2d9e3bf563889d}} @article{Ciorga20041, Abstract = {We present Coulomb blockade measurements of two few-electron quantum dots in series configured such that the electrochemical potential of one of the two dots was aligned with spin-selective leads. Charge transfer through the system required cotunneling through the second dot (which was not in resonance with the leads). The amplitude modulation of the current was found to reflect spin blockade events occurring at either of the two dots. We also confirm that charge redistribution events that occurred in the off-resonance dot could be detected indirectly via changes in the electrochemical potential of the aligned dot.}, Author = {Ciorga, M. and Pioro-Ladri{\`e}re, M. and Zawadzki, P. and Lapointe, J. and Wasilewski, Z. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {23}, Pages = {1-5}, Source = {Scopus}, Title = {Coulomb and spin blockade of two few-electron quantum dots in series in the cotunneling regime}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-13944262082&partnerID=40&md5=be03e6885372fa384737f9de87146014}, Volume = {70}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-13944262082&partnerID=40&md5=be03e6885372fa384737f9de87146014}} @article{ELP+04a, Abstract = { We report an efficient quantum algorithm for estimating the local density of states (LDOS) on a quantum computer. The LDOS describes the redistribution of energy levels of a quantum system under the influence of a perturbation. Sometimes known as the "strength function" from nuclear spectroscopy experiments, the shape of the LDOS is directly related to the survivial probability of unperturbed eigenstates, and has recently been related to the fidelity decay (or "Loschmidt echo") under imperfect motion-reversal. For quantum systems that can be simulated efficiently on a quantum computer, the LDOS estimation algorithm enables an exponential speed-up over direct classical computation. }, Author = {Emerson, J. and Lloyd, S. and Poulin, D. and Cory, D.}, Date-Modified = {2010-05-06 14:02:15 -0400}, Eprint = {quant-ph/0308164}, Journal = {Phys. Rev. A}, Keywords = {Quantum chaos; Quantum simulation}, Local-Url = {ELP+04a.pdf}, Pages = {050305}, Source = {D. Poulin 2004-09-28}, Title = {Estimation of the Local Density of States on a Quantum Computer}, Volume = {69}, Year = {2004}} @article{Evaldsson2004261, Abstract = {We demonstrate that the magnetoconductance of small lateral quantum dots in the strongly coupled regime (i.e. when the leads can support one or more propagating modes) shows a pronounced splitting of the conductance peaks and dips which persists over a wide range of magnetic fields (from zero field to the edge-state regime) and is virtually independent of the magnetic field strength. Our numerical analysis of the conductance based on the Hubbard Hamiltonian demonstrates that this is essentially a many-body/spin effect that can be traced to a splitting of degenerate levels in the corresponding closed dot. The above effect in open dots can be regarded as a counterpart of the Coulomb-blockade effect in weakly coupled dots, with the difference, however, that the splitting of the peaks originates from interactions between electrons of opposite spin.}, Author = {Evaldsson, M. and Zozoulenko, I.V. and Ciorga, M. and Zawadzki, P. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Europhysics Letters}, Number = {2}, Pages = {261-267}, Source = {Scopus}, Title = {Spin splitting in open quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-7444262951&partnerID=40&md5=dd83379fc1bac6227b2a18d2b1b18574}, Volume = {68}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-7444262951&partnerID=40&md5=dd83379fc1bac6227b2a18d2b1b18574}} @article{Florescu2004414, Abstract = {We report results of calculations of the effect of spin-orbit interaction on electron spin relaxation in a lateral quantum dot. Our study is motivated by puzzling results of high source-drain transport measurements of singlet-triplet transition of two electrons in lateral and vertical devices that show a strong asymmetry as a function of the applied magnetic field. On the low magnetic field side of the singlet-triplet transition, both the singlet ground state and the excited triplet state are experimentally resolved. Once the triplet becomes ground state, the singlet excited state is no longer observed. By exact diagonalization techniques, we evaluate the energy levels of a two-electron droplet in the presence of both Dresselhaus and Rashba contributions to the spin-orbit interaction. We then evaluate the energy relaxation rates for the two-electron droplet through the emission of LA phonons and show that they are strongly dependent on the spin of the energy levels involved in the process: transitions involving spin singlet and unpolarized triplet states remain forbidden even in the presence of spin-orbit interaction. This dephasing mechanism presents a built-in magnetic field asymmetry in qualitative agreement with experimental findings. {\copyright} 2003 Published by Elsevier B.V.}, Author = {Florescu, M. and Dickman, S. and Ciorga, M. and Sachrajda, A. and Hawrylak, P.}, Document_Type = {Conference Paper}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1-3}, Pages = {414-417}, Source = {Scopus}, Title = {Spin-orbit interaction and spin relaxation in a lateral quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-1842633326&partnerID=40&md5=79f85af2cc722521ba658743ffcdb7db}, Volume = {22}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-1842633326&partnerID=40&md5=79f85af2cc722521ba658743ffcdb7db}} @article{HKL+04a, Abstract = {Collective rotation channels are a fundamental class of channels in quantum computing and quantum information theory. The commutant of the noise operators for such a channel is a c*-algebra which is equal to the set of fixed points for the channel. Finding the precise spatial structure of the commutant algebra for a set of noise operators associated with a channel is a core problem in quantum error prevention. We draw on methods of operator algebras, quantum mechanics and combinatorics to explicitly determine the structure of the commutant for the class of collective rotation channels.}, Author = {Holbrook, J. A. and Kribs, D. W. and Laflamme, R. and Poulin, D.}, Date-Modified = {2010-05-06 14:00:52 -0400}, Eprint = {math.OA/0402105}, Journal = {Integ. Eqs. {&} Oper. Theo.}, Keywords = {Error correction}, Local-Url = {HKL+04a.pdf}, Note = {to appear}, Title = {Noiseless subsystems for collective rotation channels in quantum information theory}, Year = {2004}} @article{Korkusinski2004, Abstract = {The existence of correlated electronic states as paired spin excitations of lateral quantum dots in the integer quantum Hall regime was demonstrated. To increase the spin polarization, electrons were forced to flip spins. The second spin-flip process as one accompanied by correlated, spin depolarized phases, interpreted as pairs of spin excitons was identified. The correlated states were identified in few-electron lateral quantum dots using high source-drain voltage spectroscopy.}, Author = {Korkusi{\'n}ski, M. and Hawrylak, P. and Ciorga, M. and Pioro-Ladri{\`e}re, M. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {20}, Pages = {206806-1-206806-4}, Source = {Scopus}, Title = {Pairing of spin excitations in lateral quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-19744365569&partnerID=40&md5=3a54e6e52ae7381f247988475316d500}, Volume = {93}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-19744365569&partnerID=40&md5=3a54e6e52ae7381f247988475316d500}} @Article{Ciorga:2004p732, author = {M Ciorga and M Pioro-Ladriere and P Zawadzki and J Lapointe and Z Wasilewski and AS Sachrajda}, journal = {Phys Rev B}, title = {Coulomb and spin blockade of two few-electron quantum dots in series in the cotunneling regime}, abstract = {We present Coulomb blockade measurements of two few-electron quantum dots in series configured such that the electrochemical potential of one of the two dots was aligned with spin-selective leads. Charge transfer through the system required cotunneling through the second dot (which was not in resonance with the leads). The amplitude modulation of the current was found to reflect spin blockade events occurring at either of the two dots. We also confirm that charge redistribution events that occurred in the off-resonance dot could be detected indirectly via changes in the electrochemical potential of the aligned dot.}, affiliation = {Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada}, number = {23}, pages = {235306}, volume = {70}, year = {2004}, month = {Jan}, language = {English}, keywords = {Gate, Artificial Atoms}, date-added = {2010-05-14 10:37:44 -0400}, date-modified = {2010-05-14 10:37:44 -0400}, doi = {10.1103/PhysRevB.70.235306}, pmid = {000226112100085}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p732}, rating = {0} } @Article{Korkusinski:2004p740, author = {M Korkusinski and P Hawrylak and M Ciorga and M Pioro-Ladriere and AS Sachrajda}, journal = {Phys Rev Lett}, title = {Pairing of spin excitations in lateral quantum dots}, abstract = {We demonstrate the existence of correlated electronic states as paired spin excitations of lateral quantum dots in the integer quantum Hall regime. Starting from the spin-singlet filling-factor nu=2 droplet, by increasing the magnetic field we force the electrons to flip spins and increase the spin polarization. We identify the second spin-flip process as one accompanied by correlated, spin depolarized phases, interpreted as pairs of spin excitons. The correlated states are identified experimentally in few-electron lateral quantum dots using high source-drain voltage spectroscopy.}, affiliation = {Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada}, number = {20}, pages = {206806}, volume = {93}, year = {2004}, month = {Jan}, language = {English}, keywords = {High Magnetic-Fields, Addition Spectra, Droplets, Coulomb, Capacitance Spectroscopy, Hall Regime, Artificial Atoms, Electron-Electron Interactions}, date-added = {2010-05-14 10:38:14 -0400}, date-modified = {2010-05-14 10:38:14 -0400}, doi = {10.1103/PhysRevLett.93.206806}, pmid = {000225068800056}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p740}, rating = {0} } @article{Reulet2004IV, Year = {2004}, Abstract = {}, title = {Proximity-induced and intrinsic superconductivity in carbon nanotubes}, author = {M. Ferrier, A. Kasumov, R. Deblock, M. Kociak, S. Guéron, B. Reulet and H. Bouchiat}, journal = {Fundamental problems in mesoscopic physics, I.V. Lerner et al., Ed Kluwer Academic Publishers}, pages = {219-238}} @article{OPZ04a, Abstract = {We study the emergence of objective properties in open quantum systems. In our analysis, the environment is promoted from a passive role of reservoir selectively destroying quantum coherence, to an active role of amplifier selectively proliferating information about the system. We show that only preferred pointer states of the system can leave a redundant and therefore easily detectable imprint on the environment. Observers who---as it is almost always the case---discover the state of the system indirectly (by probing a fraction of its environment) will find out only about the corresponding pointer observable. Many observers can act in this fashion independently and without perturbing the system: they will agree about the state of the system. In this operational sense, em preferred pointer states exist objectively.}, Author = {Ollivier, H. and Poulin, D. and Zurek, W. H.}, Correct_Ref = {Yes}, Date-Modified = {2010-05-06 13:59:11 -0400}, Eprint = {quant-ph/0307229}, Journal = {Phys. Rev. Lett.}, Keywords = {Decoherence; Quantum Theory; Foundations}, Local-Url = {OPZ04a.pdf}, Pages = {220401}, Read = {Yes}, Source = {H. Ollivier 2004-12-03}, Title = {Objective properties from subjective quantum states: Environment as a witness}, Volume = {93}, Year = {2004}} @article{PBLO04b, Abstract = { We present an efficient quantum algorithm to measure the average fidelity decay of a quantum map under perturbation using a single bit of quantum information. Our algorithm scales only as the complexity of the map under investigation, so for those maps admitting an efficient gate decomposition, it provides an exponential speed up over known classical procedures. Fidelity decay is important in the study of complex dynamical systems, where it is conjectured to be a signature of eigenvector statistics. Our result also illustrates the role of chaos in the process of decoherence.}, Author = {Poulin, D. and Blume-Kohout, R. and Laflamme, R. and Ollivier, H.}, Correct_Ref = {Yes}, Date-Added = {2006-01-05 17:11:02 -0500}, Date-Modified = {2010-05-06 13:58:48 -0400}, Eprint = {quant-ph/0310038}, Journal = {Phys. Rev. Lett.}, Keywords = {Quantum chaos; Quantum simulation}, Local-Url = {PBLO04b.pdf}, Number = {17}, Pages = {177906}, Read = {Yes}, Source = {H. Ollivier, 2006-01-05}, Title = {Exponential Speedup with a Single Bit of Quantum Information: Measuring the Average Fidelity Decay}, Volume = {92}, Year = {2004}} @article{Raymond2004187402, Abstract = {The excitonic energy shell structure of self-assembled InGaAs/GaAs quantum dots (QD) was demonstrated. An unprecedently well resolved Fock-Darwin spectrum was observed by performing optical spectroscopy of highly homogeneous quantum dot arrays in ultrahigh magnetic fields. The existence of up to four degenerate electronic shells was demonstrated where the magnetic field lifts the initial degeneracies. The resulting level shifting and crossing pattern showed evidence of many-body effects like the mixing of configurations and exciton condensation at the resonances.}, Author = {Raymond, S. and Studenikin, S. and Sachrajda, A. and Wasilewski, Z. and Cheng, S.J. and Sheng, W. and Hawrylak, P. and Babinski, A. and Potemski, M. and Ortner, G. and Bayer, M.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {18}, Pages = {187402-1}, Source = {Scopus}, Title = {Excitonic energy shell structure of self-assembled InGaAs/GaAs quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-2942689946&partnerID=40&md5=2d7faf1fb224b75a2965f5114a4d6df7}, Volume = {92}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-2942689946&partnerID=40&md5=2d7faf1fb224b75a2965f5114a4d6df7}} @CONFERENCE{Reulet2004244, author = {Reulet, B., Spietz, L., Wilson, C.M., Senzier, J., Prober, D.E.}, title = {Measurement of non-Gaussian shot noise: Influence of the environment}, journal = {Proceedings of SPIE - Fluctuations and Noise in Materials}, year = {2004}, volume = {5469-33:}, pages = {244-256}, note = {cited By (since 1996) 2}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-4344629756&partnerID = 40&md5 = 08dd27b7a6c4fe416488717f3cac1101}, affiliation = {Department of Applied Physics, Yale University, New Haven, CT 06520-8284, United States; Laboratoire de Physique des Solides, UMR8502, Université Paris-Sud, 91405 Orsay, France}, abstract = {We present the first measurements of the third moment of the voltage fluctuations in a conductor. This technique can provide new and complementary information on the electronic transport in conducting systems. The measurement was performed on non-superconducting tunnel junctions as a function of voltage bias, for various temperatures and bandwidths up to 1GHz. The data demonstrate the significant effect of the electromagnetic environment of the sample.}, author_keywords = {Counting statistics; Environment; Higner moments; Non-Gaussian noise; Quantum noise; Shot noise; Third cumulant; Tunnel junction}, document_type = {Conference Paper}, source = {Scopus}} @article{Sachrajda2004, Abstract = {In this paper, we comment on the detection of spin textures by Coulomb and spin blockade in few electron lateral dots. These correlated states occur as brief spin depolarization interludes during the spin polarization of a quantum dot with a magnetic field. These states are found to possess unusual characteristics in both current stripes and Coulomb diamonds. The same features are found both in the complicated regime of the last spin flip and for the simple case of the second spin flip. {\copyright} 2003 Elsevier B.V. All rights reserved.}, Author = {Sachrajda, A.S. and Korkusinski, M. and Hawrylak, P. and Ciorga, M. and Pioro-Ladri{\`e}re, M. and Zawadzki, P.}, Document_Type = {Conference Paper}, Journal = {Journal of Magnetism and Magnetic Materials}, Number = {SUPPL. 1}, Pages = {e1273-e1274}, Source = {Scopus}, Title = {Spin textures in few electron quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-23144452217&partnerID=40&md5=12a501e96b2dac18caf8b3c57b7c5981}, Volume = {272-276}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-23144452217&partnerID=40&md5=12a501e96b2dac18caf8b3c57b7c5981}} @article{Smirnov2004432, Abstract = {We report on high-excitation photoluminescence (PL) measurements of an ensemble of InAs/GaAs self-assembled quantum dots with large inter-shell spacing (75 meV) in magnetic fields up to 73 T. The PL spectra show a complex picture of levels splitting and crossings. A simple two-band single-particle model provides a good approximation to explain the observed magneto-PL spectra. {\copyright} 2003 Elsevier B.V. All rights reserved.}, Author = {Smirnov, D. and Raymond, S. and Studenikin, S. and Babinski, A. and Leotin, J. and Frings, P. and Potemski, M. and Sachrajda, A.}, Document_Type = {Conference Paper}, Journal = {Physica B: Condensed Matter}, Number = {1-4}, Pages = {432-436}, Source = {Scopus}, Title = {Electronic structure of InAs/GaAs self-assembled quantum dots studied by high-excitation luminescence in magnetic fields up to 73 T}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-2042437748&partnerID=40&md5=c5480a70c3039cac1e3eed6bd4da24a2}, Volume = {346-347}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-2042437748&partnerID=40&md5=c5480a70c3039cac1e3eed6bd4da24a2}} @article{Studenikin2004341, Abstract = {We confirm the existence of magneto-resistance oscillations in a microwave-irradiated two-dimensional electron gas, first reported in a series of papers by Zudov et al. [Phys. Rev. B 64 (2001) 201311] and Mani et al. [Nature (London) 420 (2002) 646]. In our experiments, on a sample with a moderate mobility, the microwave induced oscillations are observed not only in the longitudinal but also in the transverse-resistance (Hall resistance). The phase of the oscillations is such that the decrease (increase) in the longitudinal resistance is accompanied by an increase (decrease) in the absolute value of the Hall resistance. We believe that these new results provide valuable new information to better understand the origin of this interesting phenomenon. {\copyright} 2003 Elsevier Ltd. All rights reserved.}, Author = {Studenikin, S.A. and Potemski, M. and Coleridge, P.T. and Sachrajda, A.S. and Wasilewski, Z.R.}, Document_Type = {Article}, Journal = {Solid State Communications}, Number = {5}, Pages = {341-345}, Source = {Scopus}, Title = {Microwave radiation induced magneto-oscillations in the longitudinal and transverse resistance of a two-dimensional electron gas}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0345375319&partnerID=40&md5=f23a3e59c2f41824117fcf32d9967286}, Volume = {129}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0345375319&partnerID=40&md5=f23a3e59c2f41824117fcf32d9967286}} @article{Studenikin20043481, Abstract = {We have performed microwave absorption and near-field reflection experiments on a high mobility GaAs/AlGaAs heterostructure for the same conditions for which Microwave-Induced Resistance Oscillations (MIROs) are observed. It is shown that the electrodynamic aspect of the problem is important in these experiments. In the absorption experiments a broad CR line was observed due to a large reflection from the highly conductive electron gas. There were no additional features observed related to absorption at harmonics of the cyclotron resonance. In near-field reflection experiments a very different oscillation pattern was revealed when compared to MIROs. The oscillation pattern observed in the reflection experiments is probably due to plasma effects occurring in a finite-size sample. The whole microscopic picture of MIROs is more complicated than simply a resonant absorption at harmonics of the cyclotron resonance. Nevertheless, the experimental observations are in good agreement with the model by Durst et al. involving the photo-assisted scattering in the presence of a crossed magnetic field and dc bias. The observed damping factor of MIROs may be attributed to a change in the electron mobility as a function of temperature. MIROs may be considered as a light-induced drift effect, a broad class of phenomena associated with a light-induced asymmetry in the velocity distribution function. {\copyright} World Scientific Publishing Company.}, Author = {Studenikin, S.A. and Potemski, M. and Sachrajda, A.S. and Hilke, M. and Pfeiffer, L.N. and West, K.W.}, Document_Type = {Conference Paper}, Journal = {International Journal of Modern Physics B}, Number = {27-29}, Pages = {3481-3488}, Source = {Scopus}, Title = {Absorption and reflection experiments on high-mobility 2DEGs in the regime of microwave-induced resistance oscillations}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-17644396010&partnerID=40&md5=6ab8513d05d38d7199e200f9583c12b2}, Volume = {18}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-17644396010&partnerID=40&md5=6ab8513d05d38d7199e200f9583c12b2}} @article{Teran20043727, Abstract = {Electrical transport measurements are reported on 2-DEG in a CdMnTe quantum well structure. At low magnetic fields the Shubnikov-de Haas oscillations show a beating pattern with nodes which are a direct consequence of the large Pauli paramagnetism. The effective electron Zeeman splitting (E Z) has been tuned via the s-d exchange interaction in order to probe the quantum Hall effect under conditions of vanishing Zeeman energy. We have observed that reducing E Z to zero does not necessary imply a closing of the spin gap. {\copyright} World Scientific Publishing Company.}, Author = {Teran, F.J. and Potemski, M. and Maude, D.K. and Hassan, A.K. and Plantier, D. and Wilamowski, Z. and Jaroszynski, J. and Wojtowicz, T. and Karczewski, G. and Sachrajda, A.}, Document_Type = {Conference Paper}, Journal = {International Journal of Modern Physics B}, Number = {27-29}, Pages = {3727-3734}, Source = {Scopus}, Title = {Electronic spins and localized magnetic moments in dilute magnetic semiconductor quantum wells}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-20244377236&partnerID=40&md5=dd0791f457eb711e89411db8a5ebb2a7}, Volume = {18}, Year = {2004}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-20244377236&partnerID=40&md5=dd0791f457eb711e89411db8a5ebb2a7}} @ARTICLE{Blais2003, author={ A. Blais}, title={Algorithms and architectures for superconducting quantum computers [Algorithmes et architectures pour ordinateurs quantiques supraconducteurs]}, journal={Annales de Physique}, year={2003}, volume={28}, number={5}, document_type={Review}, local-url = {Blais2003.pdf}} @ARTICLE{BlaisTunableCoupling, author={ A. Blais, A. Maassen Van Den Brink, A.M. Zagoskin}, title={Tunable coupling of superconducting qubits}, journal={Phys. Rev. Lett.}, year={2003}, volume={90}, number={12}, pages={127901/1-127901/4}, document_type={Article}, local-url = {BlaisTunableCoupling.pdf}} @ARTICLE{BlaisNoisyGeo, author={ A. Blais, A.-M.S. Tremblay}, title={Effect of noise on geometric logic gates for quantum computation}, journal={Phys. Rev. A}, year={2003}, volume={67}, number={1}, pages={012308/1-012308/7}, document_type={Article}, local-url = {BlaisNoisyGeo.pdf}} @article{KLP+03a, Abstract = {In a recent paper, Phys. Rev. Lett. 87, 167010/1-4 (2001), Moukouri and Jarrell presented evidence that in the two-dimensional (d=2) Hubbard model at half-filling there is a metal-insulator transition (MIT) at finite temperature even in weak coupling. While we agree with the numerical results of that paper, we arrive at different conclusions: The apparent gap at finite-temperature can be understood, at weak-coupling, as a crossover phenomenon involving large (but not infinite) antiferromagnetic (AFM) correlation length. Phase-space effects on the self-energy in d=2 are crucial, as are the ratio between AFM correlation length and single-particle thermal de Broglie wavelength. In weak coupling, d=2, there is in general no finite-temperature MIT transition in the thermodynamic sense.}, Author = {B. Kyung and J.S. Landry and D. Poulin and A.-M.S. Tremblay}, Date-Added = {2006-01-06 10:53:59 +1000}, Date-Modified = {2010-05-06 14:04:21 -0400}, Eprint = {cond-mat/ 0112273}, Journal = {Phys. Rev. Lett}, Keywords = {Condensed matter; Many-Body; Simulation}, Local-Url = {KLP+03a.pdf}, Pages = {099702}, Title = {Comment on 'Absence of a Slater Transition in the Two-Dimensional Hubbard Model'}, Volume = {90}, Year = {2003}} @article{Reulet2003066601, Year = {2003}, Abstract = {}, title = {Phase Sensitive Shot Noise in an Andreev Interferometer}, author = {B. Reulet, A.A. Kozhevnikov, D.E. Prober, W. Belzig and Yu.V. Nazarov}, journal = {Physical Review Letters}, volume = {90}, pages = {066601 }} @article{Reulet2003-4, Year = {2003}, Abstract = {}, title = {Shot Noise of Mesoscopic NS Structures: The Role of Andreev Reflection}, author = {B. Reulet, D.E. Prober and W. Belzig}, journal = {Quantum Noise in Mesoscopic Physics, Y.V. Nazarov (ed.), Kluwer Academic Publishers}, pages = {73-91}} @article{Ciorga2003325, Abstract = {Measurements and calculations previously reported for a lateral quantum dot at magnetic fields close to the transition to the maximum density droplet provided evidence that the increase of spin polarisation of a dot with magnetic field is interrupted by spin depolarization events. The loss of spin polarisation is associated with correlated states corresponding to condensation of spin excitons into spin textures. In this paper a detailed experimental and theoretical analysis is performed of the excitation spectra at the first two spin flip events in a few electron quantum dot. In this less complicated regime we are able to identify these correlated states as spin and charge excitons and bi-excitons. In particular we focus on a dot containing eight electrons. Coulomb blockade experiments, supported by detailed calculations, confirm the presence of these correlated states at the second spin flip.}, Author = {Ciorga, M. and Korkusi{\'n}ski, M. and Pioro-Ladriere, M. and Zawadzki, P. and Hawrylak, P. and Sachrajda, A.S.}, Document_Type = {Conference Paper}, Journal = {Physica Status Solidi (B) Basic Research}, Number = {2}, Pages = {325-330}, Source = {Scopus}, Title = {Simple spin textures in a quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0042665719&partnerID=40&md5=093f9db24e5b4bc576ea024d84d7bc45}, Volume = {238}, Year = {2003}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0042665719&partnerID=40&md5=093f9db24e5b4bc576ea024d84d7bc45}} @article{Ciorga2003743, Abstract = {We present the review of our work on spin effects in single lateral quantum dots with the emphasis on the results of Coulomb blockade spectroscopy studies. Realization of a spin-based quantum bit proposal in a lateral quantum dot is discussed. Described are the ways of isolating a single electron spin in a dot containing only one as well as many electrons. Demonstrated is a current readout of spin transitions in a dot by means of spin blockade spectroscopy due to spin polarized injection/detection mechanism in a lateral dot. Discussed are transitions induced both by changing a magnetic field and a number of electrons in a dot with the emphasis on the effects observed close to filling factor in a dot ν = 2. {\copyright} 2003 Plenum Publishing Corporation.}, Author = {Ciorga, M. and Sachrajda, A.S. and Hawrylak, P.}, Document_Type = {Review}, Journal = {Journal of Superconductivity and Novel Magnetism}, Number = {4}, Pages = {743-750}, Source = {Scopus}, Title = {Spin effects in lateral quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-3543063437&partnerID=40&md5=c45693552f175555fc2026d18444d623}, Volume = {16}, Year = {2003}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-3543063437&partnerID=40&md5=c45693552f175555fc2026d18444d623}} @article{Reulet2003-5, Year = {2003}, Abstract = {}, title = {Quantum coherent transport : From mesoscopic circuits to molecular wires}, author = {H. Bouchiat , R. Deblock, M. Ferrier, S. Guéron A. Kasumov, M. Kociak and B. Reulet}, journal = {New directions in Mesoscopic Physics, R. Fazio et al., Ed Kluwer Academic Publishers}, pages = {117-148}} @ARTICLE{Kasumov20032145211, author = {Kasumov, A., Kociak, M., Ferrier, M., Deblock, R., Guéron, S., Reulet, B., Khodos, I., Stéphan, O., Bouchiat, H. }, title = {Quantum transport through carbon nanotubes: Proximity-induced and intrinsic superconductivity}, journal = {Physical Review B - Condensed Matter and Materials Physics}, year = {2003}, volume = {68}, number = {21}, pages = {2145211-21452116}, art_number = {214521}, note = {cited By (since 1996) 58}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-1642534645&partnerID = 40&md5 = cfe877408d248e67375d66218b3b8318}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405 Orsay, France; Inst. Microlec. Technol./High P. M., Russian Academy of Sciences, Chernogolovka, 142432 Moscow Region, Russian Federation; RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan}, abstract = {We report low-temperature transport measurements on suspended single-walled carbon nanotubes (both individual tubes and ropes). The technique we have developed, where tubes are soldered on low-resistive metallic contacts across a slit, enables a good characterization of the samples by transmission electron microscopy. It is possible to obtain individual tubes with a room-temperature resistance smaller than 40 kfl, which remain metallic down to very low temperatures. When the contact pads are superconducting, nanotubes exhibit proximity-induced superconductivity with surprisingly large values of supercurrent. We have also recently observed intrinsic superconductivity in ropes of single-walled carbon nanotubes connected to normal contacts, when the distance between the normal electrodes is large enough, since otherwise superconductivity is destroyed by (inverse) proximity effect. These experiments indicate the presence of attractive interactions in carbon nanotubes which overcome Coulomb repulsive interactions at low temperature, and enable investigation of superconductivity in a one-dimensional limit never explored before.}, document_type = {Article}, source = {Scopus}} @ARTICLE{Kasumov20031321, author = {Kasumov, A.Y., Kociak, M., Ferrier, M., Gueron, S., Reulet, B., Khodos, I.I., Gorbatov, Yu.B., Volkov, V.T., Vaccarini, L., Bouchiat, H.}, title = {Superconductivity in ropes of single-walled carbon nanotubes}, journal = {Physica B: Condensed Matter}, year = {2003}, volume = {329-333}, number = {II}, pages = {1321-1322}, note = {cited By (since 1996) 5}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-3943095689&partnerID = 40&md5 = 9c09c1cc84a7171be7121ec3b3439572}, affiliation = {Laboratoire de Physique des Solides, Associe au CNRS, 510, Universite Paris-Sud, Orsay 91405, France; Institute of Microelectronics Technology, RAS, Chernogolovka, Moscow Reg. 142432, Russian Federation; Groupe de Dynamique des Phases Condensees, Universite Montpellier, Montpellier II 34095, France; RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan}, abstract = {We report measurements on ropes of single-walled carbon nanotubes (SWNT) in low-resistance contact to nonsuperconducting metallic pads, at low voltage and at temperatures down to 13 mK. Large resistance drops and strong non-linearities in the IV characteristics are observed below 0.4 K. These features, which disappear in magnetic field in the Tesla range, strongly suggest the existence of superconductivity in ropes of SWNT. 2003 Elsevier Science B.V. All rights reserved.}, author_keywords = {Carbon nanotubes; Luttinger liquids; Superconductivity}, document_type = {Conference Paper}, source = {Scopus}} @Article{PioroLadriere:2003p748, author = {M Pioro-Ladriere and M Ciorga and J Lapointe and P Zawadzki and M Korkusinski and P Hawrylak and AS Sachrajda}, journal = {Phys Rev Lett}, title = {Spin-blockade spectroscopy of a two-level artificial molecule}, abstract = {Coulomb- and spin-blockade spectroscopy investigations have been performed on an electrostatically defined "artificial molecule" connected to spin polarized leads. The molecule is first effectively reduced to a two-level system by placing both constituent atoms at a specific location of the level spectrum. The spin sensitivity of the conductance enables us to identify the electronic spin states of the two-level molecule. We find in addition that the magnetic field induces variations in the tunnel coupling between the two atoms. The lateral nature of the device is evoked to explain this behavior.}, affiliation = {Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada}, number = {2}, pages = {026803}, volume = {91}, year = {2003}, month = {Jan}, language = {English}, keywords = {Coulomb, Atoms, Coupled Quantum Dots}, date-added = {2010-05-14 10:37:56 -0400}, date-modified = {2010-05-14 10:37:56 -0400}, doi = {10.1103/PhysRevLett.91.026803}, pmid = {000184086000036}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p748}, rating = {0} } @article{PB03a, Abstract = {We introduce a measure of the compatibility between quantum states---the likelihood that two density matrices describe the same object. Our measure is motivated by two elementary requirements, which lead to a natural definition. We list some properties of this measure, and discuss its relation to the problem of combining two observers' states of knowledge.}, Author = {Poulin, D. and Blume-Kohout, R.}, Date-Modified = {2010-05-06 14:03:49 -0400}, Journal = {Phys. Rev. A}, Keywords = {Foundations}, Local-Url = {PB03a.pdf}, Pages = {010101(R)}, Source = {K. Kzyczkowski, 2004-11-18}, Title = {Compatibility of quantum states}, Volume = {67}, Year = {2003}} @article{PLMP03a, Abstract = {We show that deterministic quantum computing with a single bit (DQC1) can determine whether the classical limit of a quantum system is chaotic or integrable using $O(N)$ physical resources, where $N$ is the dimension of the Hilbert space of the system under study. This is a square root improvement over all known classical procedures. Our study relies strictly on the random matrix conjecture. We also present numerical results for the nonlinear kicked top.}, Author = {Poulin, D. and Laflamme, R. and Milburn, G. J. and Paz, J.-P.}, Date-Modified = {2010-05-06 14:03:18 -0400}, Eprint = {quant-ph/0303042}, Journal = {Phys. Rev. A}, Keywords = {Quantum chaos; Quantum simulation}, Local-Url = {PLMP03b.pdf}, Pages = {022302}, Title = {Testing Intergrability with a single bit of quantum information}, Volume = {68}, Year = {2003}} @ARTICLE{Reulet2003, author = {Reulet, B., Senzier, J., Prober, D.E.}, title = {Environmental effects in the third moment of voltage fluctuations in a tunnel junction}, journal = {Physical Review Letters}, year = {2003}, volume = {91}, number = {19}, pages = {196601/1-196601/4}, note = {cited By (since 1996) 134}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0348107267&partnerID = 40&md5 = 71baa3438f4693f4cb03a496e7fc016c}, affiliation = {Dept. of Applied Physics and Physics, Yale University, New Haven, CT 06520-8284, United States; Laboratoire de Physique des Solides, UMR8502, Universite Paris-Sud, Batiment 510, 91405 Orsay, France}, abstract = {The first measurements of the third moment of the voltage fluctuations across a conductor where δV(t) = V(t)-V represents the voltage fluctuations around the dc voltage V were reported. The experimental setup was such that the sample was current biased at dc and low frequency but the electromagnetic environment have an impedance ∼50 Ω within the detection bandwidth, 10 MHz to 1.2 GHz. The results were found to be in agreement with a recent theory that considers the strong effect of the electromagnetic environment of the given sample. Moreover, it was shown that certain of these environmental effects can be dramatically reduced by signal propagation delays from the sample to the amplifier.}, document_type = {Article}, source = {Scopus}} @CONFERENCE{Roche2003104, author = {Roche, P.-E., Kociak, M., Ferrier, M., Guéron, S., Kasumov, A., Reulet, B., Bouchiat, H.}, title = {Shot noise in carbon nanotubes}, journal = {Proceedings of SPIE, Noise and Information in Nanoelectronics, sensors and standards}, year = {2003}, volume = {5115}, pages = {104-115}, note = {cited By (since 1996) 4}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0041322588&partnerID = 40&md5 = 4d3d195e025815f9e71488cce8d35967}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, Bâtiment 510, 91405 Orsay, France; Ctr. de Rech. les Tres Bassses Temp., CNRS, 25 av. des Martyrs 38042, Grenoble Cedex 9, France; SPEC, Orme des Merisiers, CEA-Saclay, 91190 Gif sur Yvette, France; Inst. of Microelectronics Technology, High Purity Materials, Russian Academy of Sciences, Chernogolovka 142432 Moscow Region, Russian Federation; Institute of Physical, Chemical Research RIKEN, Semiconductors Laboratory, Hirosawa 2-1, Wako, Saitama, 351-0198, Japan; Dept. of Applied Physics and Physics, Yale University, New Haven, CT 06520-8284, United States}, abstract = {Carbon nanotubes may constitute the ultimate conducting wires for nano-electronics, with their diameters as small as a few tens of atoms and their length of order one micrometer. Because of the particular band structure of graphite, nanotubes have at most two conducting channels, which makes them a one dimensional conductor with very exotic properties. Experimental investigations have indeed shown non conventional features, such as non-ohmic behavior, superconductivity and an ability to carry a huge current density. We have carried out shot noise measurements on nanotubes which are suspended between metallic electrodes. One consequence of the suspended geometry is a very low 1/f noise, thereby enabling the extraction of shot noise. In bundles of nanotubes, we find a reduction of shot noise by more than a factor 100 compared to the full noise 2.e.I expected for uncorrelated electrons. A low noise is also found in an isolated single wall nanotube. In a simple non-interacting-electron picture, such a low shot noise implies that the electrical conduction through a bundle of nanotubes is concentrated in a few ballistic tubes. Another interpretation however would be that a substantial fraction of the tubes conduct with a strong reduction of the effective charge (more than a factor 50) due to electron-electron interaction.}, author_keywords = {Johnson-Nyquist noise; Luttinger liquid; Mesoscopic transport; Shot noise; Single wall nanotube}, document_type = {Conference Paper}, source = {Scopus}} @Article{Raymond:2003p749, author = {S Raymond and S Studenikin and SJ Cheng and M Pioro-Ladriere and M Ciorga and PJ Poole and MD Robertson}, journal = {Semicond Sci Tech}, title = {Families of islands in InAs/InP self-assembled quantum dots: a census obtained from magneto-photoluminescence}, abstract = {The low temperature photoluminescence properties of InAs/InP self-assembled quantum dots are investigated in magnetic fields up to 17 T. The zero field spectrum exhibits a number of inhomogeneously broadened peaks similar to the highly excited spectrum of InAs/GaAs quantum dots in which emission from excited states can be observed. However, for InAs/InP dots, application of a magnetic field in the Faraday configuration reveals only weak diamagnetic shifts, thus proving that the transitions originate from zero angular momentum states consistent with ground state emission from distinct families of islands present in the sample. The diamagnetic shift is observed to increase as the thickness of the island family increases. Calculations performed assuming a flat disc geometry show that the latter effect can be accounted for by the change in carrier effective mass as the dot thickness increases.}, affiliation = {Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada}, number = {4}, pages = {385--389}, volume = {18}, year = {2003}, month = {Jan}, language = {English}, keywords = {Intersublevel Transitions, Disks, Band, Spectroscopy, Vapor-Phase-Epitaxy, Wells, Inp, Magnetoluminescence, Field}, date-added = {2010-05-14 10:37:49 -0400}, date-modified = {2010-05-14 10:37:49 -0400}, pmid = {000182640500036}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p749}, rating = {0} } @article{Sadowski20033719, Abstract = {The measurement of the electron paramagnetic resonance of Mn2+ ions localized in a CdTe quantum well was performed by an all-optical method. To monitor changes in the Mn spin polarization, the photoluminescence transitions of a two-dimensional electron gas were used. The detection technique and the local character of the probe allowed the achievement of a very high sensitivity for the number of spins detected.}, Author = {Sadowski, M.L. and Byszewski, M. and Potemski, M. and Sachrajda, A. and Karczewski, G.}, Document_Type = {Article}, Journal = {Applied Physics Letters}, Number = {21}, Pages = {3719-3721}, Source = {Scopus}, Title = {Optical detection of electron paramagnetic resonance in CdMnTe single quantum wells}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0037969618&partnerID=40&md5=71f37c32d7e9b7f9dc7adbbbe05f3849}, Volume = {82}, Year = {2003}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0037969618&partnerID=40&md5=71f37c32d7e9b7f9dc7adbbbe05f3849}} @article{Studenikin2003353171, Abstract = {The magnetoresistance associated with quantum interference corrections in a high mobility, gated InxGa1-sAs/InP quantum well structure is studied as a function of temperature, gate voltage, and angle of the tilted magnetic field. Particular attention is paid to the experimental extraction of phase-breaking and spin-orbit scattering times when weak anti-localization effects are prominent. Compared with metals and low mobility semiconductors the characteristic magnetic field Btr=ℏ /4eDτ in high mobility samples is very small and the experimental dependencies of the interference effects extend to fields several hundreds of times larger. Fitting experimental results under these conditions therefore requires theories valid for arbitrary magnetic field. It was found, however, that such a theory was unable to fit the experimental data without introducing an extra, empirical, scale factor of about 2. Measurements in tilted magnetic fields and as a function of temperature established that both the weak localization and the weak antilocalization effects have the same, orbital origin. Fits to the data confirmed that the width of the low field feature, whether a weak localization or a weak antilocalization peak, is determined by the phase-breaking time and also established that the universal (negative) magnetoresistance observed in the high field limit is associated with a temperature independent spin-orbit scattering time.}, Art_Number = {035317}, Author = {Studenikin, S.A. and Coleridge, P.T. and Ahmed, N. and Poole, P.J. and Sachrajda, A.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {3}, Pages = {353171-353178}, Source = {Scopus}, Title = {Experimental study of weak antilocalization effects in a high-mobility InxGa1-xAs/InP quantum well}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0344307497&partnerID=40&md5=3f78093ecc69d720dc68a2b89566a2ac}, Volume = {68}, Year = {2003}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0344307497&partnerID=40&md5=3f78093ecc69d720dc68a2b89566a2ac}} @article{Studenikin2003311, Abstract = {There is currently a large effort to explore spin-orbit effects in semiconductor structures with the ultimate goal of manipulating electron spins with gates. A search for materials with large spin-orbit coupling is therefore important. We report results of a study of spin-orbit effects in a strained InGaAs/InP quantum well. The spin-orbit relaxation time, determined from the weak antilocalization effect, was found to depend nonmonotonically on gate voltage. The spin-orbit scattering rate had a maximum value of 5 × 10 10 s(-1) at an electron density of n = 3 × 10 15 m(-2). The scattering rate decreased from this for both increasing and decreasing densities. The smallest measured value was approximately 10 9 s(-1) at an electron concentration of n = 6 × 10 15 m(-2). This behavior could not be explained by either the Rashba or the bulk Dresselhaus mechanisms but is attributed to asymmetry or strain effects at dissimilar quantum well interfaces. {\copyright} 2003 MAIK "Nauka/ Interperiodica".}, Author = {Studenikin, S.A. and Coleridge, P.T. and Poole, P. and Sachrajda, A.}, Document_Type = {Article}, Journal = {JETP Letters}, Number = {6}, Pages = {311-316}, Source = {Scopus}, Title = {Anomalous spin-orbit effects in a strained InGaAs/InP quantum well structure}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-1842649151&partnerID=40&md5=e6e9608f0abf63e3cef5dc4ad3126707}, Volume = {77}, Year = {2003}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-1842649151&partnerID=40&md5=e6e9608f0abf63e3cef5dc4ad3126707}} @article{Teran2003772011, Abstract = {The study of the collective character of low energy spin excitations in n-type CdMnTe based semiconductor quantum wells was discussed. A large Knight shift was observed, for magnetic fields for which the energies for excitation of free carriers and Mn spins were identical. Magnetic-field induced ferromagnetic order were found to be present in these structures.}, Author = {Teran, F.J. and Potemski, M. and Maude, D.K. and Plantier, D. and Hassan, A.K. and Sachrajda, A. and Wilamowski, Z. and Jaroszynski, J. and Wojtowicz, T. and Karczewski, G.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {7}, Pages = {772011-772014}, Source = {Scopus}, Title = {Collective Character of Spin Excitations in a System of Mn2+ Spins Coupled to a Two-Dimensional Electron Gas}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0141681383&partnerID=40&md5=32612b561d55d24d2dc9c5b7b9b9b400}, Volume = {91}, Year = {2003}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0141681383&partnerID=40&md5=32612b561d55d24d2dc9c5b7b9b9b400}} @ARTICLE{Amin2002310, author={ M.H.S. Amin, A.N. Omelyanchouk, A. Blais, A.M.V.D. Brink, G. Rose, T. Duty, A.M. Zagoskin}, title={Multi-terminal superconducting phase qubit}, journal={Physica C: Superconductivity and its Applications}, year={2002}, volume={368}, number={1-4}, pages={310-314}, document_type={Conference Paper}, local-url = {Amin2002310.pdf}} @article{Ciorga20022177, Abstract = {The single-electron transistors containing a few electrons and spin polarized source and drain contacts were formed in GaAs/GaAlAs heterojunctions using metallic gates. Coulomb blockade measurements reveal well-defined regimes where a decrease in the current is observed with increasing bias. We establish that the origin of the negative regime is the spin-polarized detection of electrons combined with a long spin relaxation time in the dot. {\copyright} 2002 American Institute of Physics.}, Author = {Ciorga, M. and Pioro-Ladriere, M. and Zawadzki, P. and Hawrylak, P. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Applied Physics Letters}, Number = {12}, Pages = {2177-2179}, Source = {Scopus}, Title = {Tunable negative differential resistance controlled by spin blockade in single-electron transistors}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79956048397&partnerID=40&md5=7f541d1ab14c10699e9ede093bb3ffc0}, Volume = {80}, Year = {2002}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79956048397&partnerID=40&md5=7f541d1ab14c10699e9ede093bb3ffc0}} @article{Ciorga20022568041, Abstract = {The stability of the filling factor two spin-singlet phase of a quantum dot was studied as a function of electron number and magnetic field. It was demonstrated that this phase collapsed at a certain electron number in favor of spin-polarized configurations. Results demonstrated the effects uncovered by the control of electron spin in nanoscale object with tunable and controlled number of electrons.}, Author = {Ciorga, M. and Wensauer, A. and Pioro-Ladriere, M. and Korkusinski, M. and Kyriakidis, J. and Sachrajda, A.S. and Hawrylak, P.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {25 I}, Pages = {2568041-2568044}, Source = {Scopus}, Title = {Collapse of the spin-singlet phase in quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0037166836&partnerID=40&md5=e447e92d745d0202f7921b242127ad13}, Volume = {88}, Year = {2002}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0037166836&partnerID=40&md5=e447e92d745d0202f7921b242127ad13}} @article{Coleridge20021253281, Abstract = {Magnetoresistance results are presented for p-SiGe samples on the metallic side of the B = 0 metal-insulator transition. It was possible to separate the weak localization and Zeeman interaction effects but the results could not be explained quantitatively within the framework of standard theories for quantum corrections of a weakly interacting two-dimensional system. Analysis using a theory for interaction corrections at intermediate temperatures, recently proposed by Zala, Narozhny, and Aleiner provided values of the Fermi-liquid parameter F o σ of order -0.5. Similar values also explain the linear increase of resistance with temperature characteristic of the metallic phase.}, Art_Number = {125328}, Author = {Coleridge, P.T. and Sachrajda, A.S. and Zawadzki, P.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {12}, Pages = {1253281-12532810}, Source = {Scopus}, Title = {Weak localization, interaction effects, and the metallic phase in p-SiGe}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0037088227&partnerID=40&md5=7a746ef2c2d513274ad49b6817086f88}, Volume = {65}, Year = {2002}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0037088227&partnerID=40&md5=7a746ef2c2d513274ad49b6817086f88}} @article{lidar2002, Year = {2002}, Abstract = {}, author = {D.A. Lidar, L.-A. Wu and A. Blais}, title = {Simplifying Design and Suppressing Decoherence for Superconducting Phase-Qubit Quantum Computers}, journal = {Quantum Information Processing,}, pages = {155}, volume = {1}, local-url = {lidar2002.pdf}} @misc{Pou02a, Abstract = {This tutorial offers some insight into the question ``What is quantum chaos and why is it interesting?'. Its main purpose is to present some signatures of chaos in the quantum world. This is {it not} a technical reference, it contains but a few simple equations and no explicit references; rather, the main body of this manuscript is followed by a reading guide. Some of the mathematical tools used in the field are so cumbersome they often obscure the physical relevance of the problem under investigation. However, after having consulted this tutorial, the technical literature should appear less mysterious and, we hope, one should have a better intuition of what is interesting, and what is superficial!}, Author = {David Poulin}, Date-Added = {2006-01-06 10:42:45 +1000}, Date-Modified = {2010-05-06 14:05:02 -0400}, Keywords = {Quantum chaos}, Local-Url = {Pou02a.pdf}, Title = {A rough guide to quantum chaos}, Year = {2002}} @ARTICLE{Deblock20022068031, author = {Deblock, R., Bel, R., Reulet, B., Bouchiat, H., Mailly, D.}, title = {Diamagnetic orbital response of mesoscopic silver rings}, journal = {Physical Review Letters}, year = {2002}, volume = {89}, number = {20}, pages = {2068031-2068034}, note = {cited By (since 1996) 58}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-20744432625&partnerID = 40&md5 = 7c754ed902172cea5349a4a9b00035bd}, affiliation = {Laboratoire de Physique des Solides, Bâtiment 510, Université Paris-Sud, 91405 Orsay, France; CNRS, Lab. de Photonique et Nanostructures, route de Nogay, 91460 Marcoussi, France}, abstract = {The magnetic flux-dependent orbital magnetic susceptibility of an ensemble of 105 disconnected silver rings was measured at 217 MHz. The signal was consistent with dimagnetic averaged persistent currents. The sign of the oscillations indicated unambiguously diamagnetism in the vicinity of zero magnets.}, document_type = {Article}, source = {Scopus}} @ARTICLE{Deblock20020753011, author = {Deblock, R., Noat, Y., Reulet, B., Bouchiat, H., Mailly, D.}, title = {AC electric and magnetic responses of nonconnected Aharonov-Bohm rings}, journal = {Physical Review B - Condensed Matter and Materials Physics}, year = {2002}, volume = {65}, number = {7}, pages = {0753011-07530114}, art_number = {075301}, note = {cited By (since 1996) 18}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-4243314639&partnerID = 40&md5 = 09d0ee09c0a81aa3c60d35402c2aeaae}, affiliation = {Laboratoire de Physique des Solides, Bâtiment 510, Université Paris-Sud, 91405 Orsay, France}, abstract = {The signature of phase coherence on the electric and magnetic response of 105 nonconnected aharonov-bohm rings is measured by a resonant method at 350 MHz between 20 mK and 500 mK. The rings are etched in a GaAs-AlxGa1-xAs heterojunction. Both quantities exhibit an oscillating behavior with a periodicity consistent with half a flux quantum φ0/2 = h/2e in a ring. We find that electric screening is enhanced when time-reversal symmetry is broken by magnetic field, leading, to a positive magnetopolarizability, in agreement with theoretical predictions for isolated rings at finite frequency. Temperature and electronic-density dependences are investigated. The dissipative part of the electric response, the electric absorption, is also measured and leads to a negative magnetoconductance. The magnetic orbital response of the very same rings is also investigated. It is consistent with diamagnetic persistent currents of 0.25 nA. This magnetic response is an order of magnitude smaller than the electric one, in qualitative agreement with theoretical expectations.}, document_type = {Article}, source = {Scopus}} @Article{Kyriakidis:2002p761, author = {J Kyriakidis and M Pioro-Ladriere and M Ciorga and AS Sachrajda and P Hawrylak}, journal = {Phys Rev B}, title = {Voltage-tunable singlet-triplet transition in lateral quantum dots}, abstract = {Results of calculations and high source-drain transport measurements are presented, which demonstrate voltage-tunable entanglement of electron pairs in lateral quantum dots. At a fixed magnetic field, the application of a judiciously chosen gate voltage alters the ground state of an electron pair from an entagled spin singlet to a spin triplet.}, affiliation = {Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada}, number = {3}, pages = {035320}, volume = {66}, year = {2002}, month = {Jan}, language = {English}, keywords = {Atoms, Gates, Double-Barrier Heterostructures, Spectroscopy, Magnetic-Field, Computer, States}, date-added = {2010-05-14 10:38:29 -0400}, date-modified = {2010-05-14 10:38:29 -0400}, doi = {10.1103/PhysRevB.66.035320}, pmid = {000177338500082}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p761}, rating = {0} } @article{Kyriakidis2002353201, Abstract = {Results of calculations and high source-drain transport measurements are presented, which demonstrate voltage-tunable entanglement of electron pairs in lateral quantum dots. At a fixed magnetic field, the application of a judiciously chosen gate voltage alters the ground state of an electron pair from an entagled spin singlet to a spin triplet.}, Art_Number = {035320}, Author = {Kyriakidis, J. and Pioro-Ladriere, M. and Ciorga, M. and Sachrajda, A.S. and Hawrylak, P.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {3}, Pages = {353201-353208}, Source = {Scopus}, Title = {Voltage-tunable singlet-triplet transition in lateral quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0037101225&partnerID=40&md5=d48c3a1ee3b0ab90dfdd0a24da4f7f34}, Volume = {66}, Year = {2002}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0037101225&partnerID=40&md5=d48c3a1ee3b0ab90dfdd0a24da4f7f34}} @Article{Ciorga:2002p762, author = {M Ciorga and A Wensauer and M Pioro-Ladriere and M Korkusinski and J Kyriakidis and AS Sachrajda and P Hawrylak}, journal = {Phys Rev Lett}, title = {Collapse of the spin-singlet phase in quantum dots}, abstract = {We present experimental and theoretical results on a new regime in quantum dots in which the filling factor two-singlet state is replaced by new spin polarized phases. We make use of spin blockade spectroscopy to identify the transition to this new regime as a function of the number of electrons. The key experimental observation is a reversal of the phase in the systematic oscillation of the amplitude of Coulomb blockade peaks as the number of electrons is increased above a critical number. It is found theoretically that correlations are crucial to the existence of the new phases.}, affiliation = {Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada}, number = {25}, pages = {256804}, volume = {88}, year = {2002}, month = {Jan}, language = {English}, keywords = {Artificial Atoms, Coulomb, Magnetic-Fields, Addition Spectrum, Spectroscopy}, date-added = {2010-05-14 10:38:23 -0400}, date-modified = {2010-05-14 10:38:23 -0400}, doi = {10.1103/PhysRevLett.88.256804}, pmid = {000176554800038}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p762}, rating = {0} } @Article{Ciorga:2002p759, author = {M Ciorga and M Pioro-Ladriere and P Zawadzki and P Hawrylak and AS Sachrajda}, journal = {Appl Phys Lett}, title = {Tunable negative differential resistance controlled by spin blockade in single-electron transistors}, abstract = {The single-electron transistors containing a few electrons and spin polarized source and drain contacts were formed in GaAs/GaAlAs heterojunctions using metallic gates. Coulomb blockade measurements reveal well-defined regimes where a decrease in the current is observed with increasing bias. We establish that the origin of the negative regime is the spin-polarized detection of electrons combined with a long spin relaxation time in the dot. (C) 2002 American Institute of Physics.}, affiliation = {Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada}, number = {12}, pages = {2177--2179}, volume = {80}, year = {2002}, month = {Jan}, language = {English}, keywords = {Nonlinear Transport, Spectroscopy, Coulomb, Spectrum, Quantum Dots, Injection}, date-added = {2010-05-14 10:38:26 -0400}, date-modified = {2010-05-14 10:38:26 -0400}, doi = {10.1063/1.1459489}, pmid = {000174498700045}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p759}, rating = {0} } @ARTICLE{Noat20020753051, author = {Noat, Y., Deblock, R., Reulet, B., Bouchiat, H.}, title = {Magnetopolarizability of mesoscopic systems}, journal = {Physical Review B - Condensed Matter and Materials Physics}, year = {2002}, volume = {65}, number = {7}, pages = {0753051-07530512}, art_number = {075305}, note = {cited By (since 1996) 0}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0037084632&partnerID = 40&md5 = 595c17c92731ddbc74355030a97d988e}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405 Orsay, France}, abstract = {In order to understand how screening is modified by electronic interferences in a mesoscopic isolated system, we have computed both analytically and numerically the average thermodynamic and time-dependent polarizabilities of two-dimensional mesoscopic samples in the presence of an Aharonov-Bohm flux. Two geometries have been considered: rings and squares. Mesoscopic correction to screening are taken into account in a self consistent way, using the response function formalism. The role of the statistical ensemble (canonical and grand canonical), disorder and frequency have been investigated. We have also computed first order corrections to the polarizability due to electron-electron interactions. Our main results concern the diffusive regime. In the canonical ensemble, there is no flux dependence in the polarizability when the frequency is much smaller than the level spacing. On the other hand, in the grand canonical ensemble for frequencies larger than the mean broadening of the energy levels (but still small compared to the level spacing), the polarizability oscillates with flux, with the periodicity h/2e. The order of magnitude of the effect is given by δα/α∝(λs/Wg), where λ is the Thomas-Fermi screening length, W the width of the rings or the size of the squares, and g their average dimensionless conductance. This magnetopolarizability of Aharonov-Bohm rings has been recently measured experimentally [R. Deblock, Y. Noat, H. Bouchiat, B. Reulet and D. Mailly, Phys. Rev. Lett. 84, 3579 (2000)] and is in good agreement with our grand canonical result.}, document_type = {Article}, source = {Scopus}} @ARTICLE{Roche2002217, author = {Roche, P.-E., Kociak, M., Guéron, S., Kasumov, A., Reulet, B., Bouchiat, H.}, title = {Very low shot noise in carbon nanotubes}, journal = {European Physical Journal B}, year = {2002}, volume = {28}, number = {2}, pages = {217-222}, note = {cited By (since 1996) 36}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0038238160&partnerID = 40&md5 = 862b43f65e08b8aa29da1a2bc7295f67}, affiliation = {Lab. de Physique des Solides, Bâtiment 510, Université Paris-Sud, 91405 Orsay Cedex, France; Lab. de Phys. de la Matiere Cond., Ecl. Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France; Inst. Microlectron. Technol. High P., Russian Academy of Sciences, Chernogolovka 142432, Russian Federation}, abstract = {We have performed noise measurements on suspended ropes of single wall carbon nanotubes (SWNT) between 1 and 300 K for different values of dc current through the ropes. We find that the shot noise is suppressed by more than a factor 100 compared to the full shot noise 2eI. We have also measured an individual SWNT and found a level of noise which is smaller than the minimum expected. Another finding is the very low level of 1/f noise, which is significantly lower than previous observations. We propose two possible interpretations for the strong shot noise reduction: i) Transport within a rope takes place through few nearly ballistic tubes within a rope and possibly involves non integer effective charges with e* ∼ 0.3e. ii) A substantial fraction of the tubes conduct with a strong reduction of effective charge (by more than a factor 50).}, author_keywords = {72.70.+m Noise processes and phenomena; 73. Electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures}, document_type = {Article}, source = {Scopus}} @ARTICLE{Blais2001, author={ A. Blais}, title={Quantum network optimization}, journal={Phys. Rev. A}, year={2001}, volume={64}, number={2}, pages={022312/1-022312/5}, document_type={Article}, local-url = {Blais2001.pdf}} @article{Reulet2001VU, Year = {2001}, Abstract = {}, title = {Plein Sud }, author = {B. Reulet}, journal = {Spécial Recherche }, volume = {97}, pages = {61}} @article{Ciorga200135, Abstract = {We present experimental and theoretical results demonstrating the readout of a single spin based quantum bit by current detection. The quantum bit has been built by isolating a single electron spin in a lateral dot with a tunable number of electrons. The spin state of the dot was read from the current amplitude resulting from the injection of spin polarized electrons. The current amplitude showed a systematic dependence on the spin state of the dot controlled by the number of electrons. {\copyright} 2001 Elsevier Science B.V. All rights reserved.}, Author = {Ciorga, M. and Sachrajda, A.S. and Hawrylak, P. and Gould, C. and Zawadzki, P. and Feng, Y. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1}, Pages = {35-40}, Source = {Scopus}, Title = {Readout of a single electron spin based quantum bit by current detection}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0035451061&partnerID=40&md5=aad641fc2d99493734a65bdde975306a}, Volume = {11}, Year = {2001}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0035451061&partnerID=40&md5=aad641fc2d99493734a65bdde975306a}} @article{Reulet2001VU2, Year = {2001}, Abstract = {}, title = {Les propriétés électriques des systèmes mésoscopiques}, author = {H. Bouchiat, R. Deblock, Y. Noat et B. Reulet}, journal = {Pour la Science }, volume = {290 }} @ARTICLE{Kasumov2001280, author = {Kasumov, A.Yu., Kociak, M., Guéron, S., Reulet, B., Volkov, V.T., Klinov, D.V., Bouchiat, H.}, title = {Proximity-induced superconductivity in DNA}, journal = {Science}, year = {2001}, volume = {291}, number = {5502}, pages = {280-282}, note = {cited By (since 1996) 341}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0035847088&partnerID = 40&md5 = cc231d732e944d2138cf4ad2e1d267ef}, affiliation = {Starlab, La tour de Freins, 555 rue Engeland, 1180 Uclle, Brussels, Belgium}, abstract = {Conductivity measurements on double-stranded DNA molecules deposited by a combing process across a submicron slit between rhenium/carbon metallic contacts reveal conduction to be ohmic between room temperature and 1 kelvin. The resistance per molecule is less than 100 kilohm and varies weakly with temperature. Below the superconducting transition temperature (1 kelvin) of the contacts, proximity-induced superconductivity is observed. These results imply that DNA molecules can be conducting down to millikelvin temperature and that phase coherence is maintained over several hundred nanometers.}, document_type = {Article}, source = {Scopus}} @ARTICLE{Kociak20012416, author = {Kociak, M., Kasumov, A.Yu., Guéron, S., Reulet, B., Khodos, I.I., Gorbatov, Yu.B., Volkov, V.T., Vaccarini, L., Bouchiat, H.}, title = {Superconductivity in ropes of single-walled carbon nanotubes}, journal = {Physical Review Letters}, year = {2001}, volume = {86}, number = {11}, pages = {2416-2419}, note = {cited By (since 1996) 201}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0035848218&partnerID = 40&md5 = 13f1bd5fb3057bb304b0f6151afa2a7f}, affiliation = {Starlab, La tour de Freins, 555 rue Engeland, 1180 Uclle, Brussels, Belgium}, abstract = {Measurements on ropes of single-walled carbon nanotubes (SWNT) were presented. Results show that ropes of carbon nanotubes are intrinsically superconducting. This is the first observation of superconductivity in a system with such a small number of conduction channels. The understanding of this superconductivity calls for future experimental and theoretical work and motivates in particular a search of superconducting fluctuations in a single SWNT.}, document_type = {Article}, source = {Scopus}} @article{Pou01a, Abstract = {The ultimate goal of the classicality program is to quantify the amount of quantumness of certain processes. Here, classicality is studied for a restricted type of process: quantum information processing (QIP). Under special conditions, one can force some qubits of a quantum computer into a classical state without affecting the outcome of the computation. The minimal set of conditions is described and its structure is studied. Some implications of this formalism are the increase of noise robustness, a proof of the quantumness of mixed state quantum computing and a step forward in understanding the very foundation of QIP.}, Author = {Poulin, D.}, Date-Modified = {2010-05-06 14:05:56 -0400}, Eprint = {quant-ph/0108102}, Journal = {Phys. Rev. A}, Keywords = {Foundations}, Local-Url = {Pou01a.pdf}, Pages = {42319}, Title = {Classicality of Quantum Information Processing}, Volume = {65}, Year = {2001}} @conference{Sachrajda200134, Abstract = {This paper discusses some of the issues related to quantum dots that were raised during the first session on transport phenomena at the Nobel Symposium.}, Author = {Sachrajda, A.S.}, Document_Type = {Conference Paper}, Journal = {Physica Scripta T}, Pages = {34-36}, Source = {Scopus}, Title = {Quantum chaos and transport phenomena in quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0035002379&partnerID=40&md5=b5d2f9fe32f322ece9fc923f3e1f72ff}, Volume = {90}, Year = {2001}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0035002379&partnerID=40&md5=b5d2f9fe32f322ece9fc923f3e1f72ff}} @article{Sachrajda2001493, Abstract = {We describe transport measurements on a small lateral dot involving spin polarized injection and detection. The novel layout of the lateral dot allows its electron occupation number to be reduced to 0 from 60 while maintaining operating tunneling barriers. The spin polarized injection occurs above (0.4 T) due to the presence of spin resolved edge states in the two dimensional electron gas which form the leads to the quantum dot. We demonstrate the consequences of spin polarized leads by focusing on two spin properties of the quantum dot close to filling factor, ν, 2. Firstly, we illustrate an alternating odd/even occupation number effect due to spin blockade through current readout at ν=2. Secondly, we detect spin transitions directly at fixed electron number in the quantum dot as the magnetic field is lowered away from ν=2. The experimental results are explained by a comparison to theoretical calculations of the ground states in the different regimes. The current readout process is one of the requirements of a quantum dot based spin qubit quantum computer. {\copyright} 2001 Elsevier Science B.V.}, Author = {Sachrajda, A.S. and Hawrylak, P. and Ciorga, M. and Gould, C. and Zawadzki, P.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1-3}, Pages = {493-498}, Source = {Scopus}, Title = {Spin polarized injection into a quantum dot by means of the spatial separation of spins}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0035337203&partnerID=40&md5=5a0e057b46393f586725327c53c3981b}, Volume = {10}, Year = {2001}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0035337203&partnerID=40&md5=5a0e057b46393f586725327c53c3981b}} @ARTICLE{Blais2000423081, author={ A. Blais, A.M. Zagoskin}, title={Operation of universal gates in a solid-state quantum computer based on clean Josephson junctions between d-wave superconductors}, journal={Phys. Rev. A}, year={2000}, volume={61}, number={4}, pages={423081-423084}, document_type={Article}, local-url = {Blais2000423081.pdf}} @ARTICLE{Grant20001356, author={ P. Grant, C. Py, C. Mossner, A. Blais, H. Tran, M. Gao}, title={Electron field emission from diamond-like carbon, a correlation with surface modifications}, journal={Journal of Applied Physics}, year={2000}, volume={87}, number={3}, pages={1356-1360}, document_type={Article}, local-url = {Grant20001356.pdf}} @article{Ciorga2000, Abstract = {Transport measurements are presented on a class of electrostatically defined lateral dots within a high mobility two-dimensional electron gas (2DEG). The design allows Coulomb blockade (CB) measurements to :' be performed on a single lateral dot containing 0, 1 to over 50 electrons. The CB measurements are enhanced by the spin polarized injection from and into 2DEG magnetic edge states. This combines the measurement of charge with the measurement of spin through spin-blockade spectroscopy. The results of Coulomb and spin-blockade spectroscopy for the first 45 electrons enable us to construct the addition spectrum of a lateral device. We also demonstrate that a lateral dot containing a single electron is an effective local probe of a 2DEG edge. {\copyright}2000 The American Physical Society.}, Author = {Ciorga, M. and Sachrajda, A.S. and Hawrylak, P. and Gould, C. and Zawadzki, P. and Jullian, S. and Feng, Y. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {24}, Pages = {R16315-R16318}, Source = {Scopus}, Title = {Addition spectrum of a lateral dot from Coulomb and spin-blockade spectroscopy}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000798397&partnerID=40&md5=42de5612a7da3561274b88a02d3a8fb0}, Volume = {61}, Year = {2000}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000798397&partnerID=40&md5=42de5612a7da3561274b88a02d3a8fb0}} @article{Coleridge2000268, Abstract = {The strained p-type SiGe system exhibits, in addition to the normal integer quantum Hall effect (IQHE) transitions, an insulating phase near filling factor ν = 3/2 and a B = 0 metal-insulator transition of the kind observed in high-mobility Si-MOSFETs. Samples were grown by a ultra-high vacuum chemical vapor deposition process. The quantum well is sufficiently narrow that the lattice constant difference between the alloy and the pure Si is all taken up by strain which means the heavy hole band is well separated by the other bands. Magnetoresistance measurements are presented for strained p-SiGe quantum well where the density is varied through the B = 0 metal-insulator transition.}, Author = {Coleridge, P.T. and Zawadzki, P. and Sachrajda, A.S. and Williams, R.L. and Feng, Y.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1}, Pages = {268-271}, Source = {Scopus}, Title = {Universal behaviour of metal-insulator transitions in the p-SiGe system}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034138855&partnerID=40&md5=f603015c499e649625db2d333b76bc09}, Volume = {6}, Year = {2000}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034138855&partnerID=40&md5=f603015c499e649625db2d333b76bc09}} @Article{Senechal:2000p768, author = {D Senechal and D Perez and M Pioro-Ladriere}, journal = {Phys Rev Lett}, title = {Spectral weight of the Hubbard model through cluster perturbation theory}, abstract = {We calculate the spectral weight of the one- and two-dimensional Hubbard models by performing exact diagonalizations of finite clusters and treating intercluster hopping with perturbation theory. Even with relatively modest clusters (e.g., 12 sites), the spectra thus obtained give an accurate description of the exact results. Spin-charge separation (i.e., an extended spectral weight bounded by singularities dispersing with wave vector) is clearly recognized in the one-dimensional Hubbard model, and so is extended spectral weight in the two-dimensional Hubbard model. PACS numbers: 71.27.+ a, 71.10.Fd. 71.10.Pm, 71.15.Pd.}, affiliation = {Univ Sherbrooke, Ctr Rech Proprietes Elect Mat Avances, Sherbrooke, PQ J1K 2R1, Canada}, number = {3}, pages = {522--525}, volume = {84}, year = {2000}, month = {Jan}, language = {English}, keywords = {Superconductors, Correlated Electrons, Dispersion, Spin-Charge Separation}, date-added = {2010-05-14 10:38:36 -0400}, date-modified = {2010-05-14 10:38:36 -0400}, pmid = {000084787300032}, uri = {papers://2218479D-7AA1-43D5-8E9E-4EF38C7D1379/Paper/p768}, rating = {0}} @ARTICLE{Deblock20005379, author = {Deblock, R., Noat, Y., Bouchiat, H., Reulet, B., Mailly, D.}, title = {Measurements of Flux-Dependent Screening in Aharonov-Bohm Rings}, journal = {Physical Review Letters}, year = {2000}, volume = {84}, number = {23}, pages = {5379-5382}, note = {cited By (since 1996) 15}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0000238760&partnerID = 40&md5 = 85c01e716f41042347c8bcfca1f84ace}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405, Orsay, France; CNRS Lab. Microstructure M., 196 avenue Ravera, 92220, Bagneux, France}, abstract = {In order to investigate the effect of electronic phase coherence on screening we have measured the flux-dependent polarizability of isolated mesoscopic rings at 350 MHz. At low temperatures (below 100 mK) both the nondissipative and the dissipative parts of the polarizability exhibit flux oscillations with a period of one-half a flux quantum in a ring. The sign and amplitude of the effect are in good agreement with recent theoretical predictions. The observed positive magnetopolarizability corresponds to an enhancement of screening when time reversal symmetry is broken. The effect of electronic density and temperature are also measured.}, document_type = {Article}, source = {Scopus}} @ARTICLE{Deblock2000787, author = {Deblock, R., Noat, Y., Reulet, B., Bouchiat, H.}, title = {Signature of phase coherence in isolated mesoscopic systems [Signature de la cohérence de phase dans les systèmes mésoscopiqes isolés]}, journal = {Comptes Rendus de l'Academie des Sciences - Series IV: Physics, Astrophysics}, year = {2000}, volume = {1}, number = {6}, pages = {787-800}, note = {cited By (since 1996) 0}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0034239292&partnerID = 40&md5 = 34e2d15243d1b9f665c180d58f4a6e1f}, affiliation = {Laboratoire de Physique des Solides, Associe au CNRS, Bât 510, 91405 Orsay, France}, abstract = {At low temperature, electronic wave functions in a metal keep their phase coherence on a length Lφ which can be of the order of few microns. Transport and thermodynamic properties of mesoscopic systems whose size are smaller than Lφ exhibit spectacular signatures of this coherence which can be revealed by instance through the sensitivity of the phase of the electrons to an applied vector potential. These quantum effects crucially depend on the way measurements are performed, in this paper we emphasize the difference between: • connected open systems, characterized by their transmission properties accessible through conductance measurements; • electrically isolated, closed systems caracterized by their energy level spectra and investigated through thermodynamic (mostly magnetization) and ac conductance (response to an electromagnetic wave) measurements. They correspond to different types of coupling to the measuring apparatus, and present different sensitivities to phase coherence. The amplitude of quantum oscillations of the magnetoconductance on a connected system are indeed only a small fraction of the classical conductance and can be much larger on an isolated system. 2000 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS.}, author_keywords = {Quantum coherent mesoscopic systems}, document_type = {Article}, source = {Scopus}} @conference{Fafard2000100, Abstract = {The artificial atoms with sharp electronic shells can be fabricated with good control are demonstrated using self-assembled quantum dots (QD) grown by molecular beam epitaxy. Size and shape engineering of the QD during growth permits the tailoring of their intersublevel energy spacings. In addition to size and shape engineering of the QD in the case of single-layer samples, significant improvements in the uniformity of the vertically self-aligned stacked QDs were observed. State-filling spectroscopy of the zero-dimensional transitions between confined electrons and holes show that the energy levels are readily tunable.}, Author = {Fafard, S. and Liu, H.C. and Wasilewski, Z.R. and McCaffrey, J. and Spanner, M. and Raymond, S. and Allen, C.Ni. and Hinzer, K. and Lapointe, J. and Struby, C. and Gao, M. and Hawrylak, P. and Gould, C. and Sachrajda, A. and Zawadzki, P.}, Document_Type = {Conference Paper}, Journal = {Proceedings of SPIE - The International Society for Optical Engineering}, Pages = {100-114}, Source = {Scopus}, Title = {Quantum dot devices}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0033684771&partnerID=40&md5=9ed83dd70ad87229b516e8d3c3ed1c6f}, Volume = {4078}, Year = {2000}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0033684771&partnerID=40&md5=9ed83dd70ad87229b516e8d3c3ed1c6f}} @article{Feng2000730, Abstract = {A fabrication procedure for submicron airbridges was established. The successful implementation of the procedure in real mesoscopic devices was demonstrated by using the ballistic magnetoresistance signatures of an elliptical antidot within quantum point contacts.}, Author = {Feng, Y. and Sachrajda, A.S. and Zawadzki, P. and Kolind, S. and Buchanan, M. and Smet, J.H. and Lapointe, J. and Marshall, P.A.}, Document_Type = {Article}, Journal = {Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films}, Number = {2}, Pages = {730-733}, Source = {Scopus}, Title = {Fabrication of parallel quantum point contacts with submicron airbridges}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034155732&partnerID=40&md5=fa7d67ec855422a53ac138077f036695}, Volume = {18}, Year = {2000}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034155732&partnerID=40&md5=fa7d67ec855422a53ac138077f036695}} @article{Gould2000461, Abstract = {We investigate correlation effects in few-electron lateral quantum dots between filling factor ν = 2 and 1. The correlations are the non-trivial spin depolarization events associated with the evolution of the total spin of the droplet with increasing magnetic field. We monitor the spin evolution by measurements of coulomb blockade (CB) peaks on lateral quantum dot devices containing from 5 to 20 electrons. Measurements are made as a function of the magnetic field, temperature, and source-drain bias. The temperature and high source-drain bias dependence of the CB peaks in the vicinity of the spin-flip are consistent with spin depolarization events due to electronic correlations.}, Author = {Gould, C. and Hawrylak, P. and Sachrajda, A. and Feng, Y. and Zawadzki, P. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1}, Pages = {461-465}, Source = {Scopus}, Title = {Correlations effects in few-electron quantum dots between ν = 2 and 1}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034138988&partnerID=40&md5=970ff57c04b29e6884783645e68fb69a}, Volume = {6}, Year = {2000}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034138988&partnerID=40&md5=970ff57c04b29e6884783645e68fb69a}} @techreport{TP00a, Abstract = {Nous présentons dans ce rapport une introduction complète à deux algorithmes couramment utilisés en physique du solide dans le cadre du problème à N-corps quantique. Le premier est l'algorithme de Blankenbecler, Scalapino et Sugar (bss) (aussi appelé algorithme du déterminant), développé au début des années 80 dans le but de calculer numériquement les propriétés thermodynamiques de certains modèles d'électrons fortement corrélés, dont celui de Hubbard, étudié ici comme modèle pour la supraconductivité à haut Tc. Pour cette partie du rapport, notre étude présente d'abord le fonctionnement de l'algorithme pour s'attarder ensuite à certains de ses aspects numériques, en particulier ceux qui sont problématiques au niveau de la stabilité des calculs. Parmi ceux-ci, nous retrouvons les instabilités liées aux calculs à basse température, le choix de la décomposition de Trotter, le calcul des fonctions de Green et des observables à temps inégal, de même que le problème d'ergodicité. En deuxième partie, nous abordons le calcul des propriétés dynamiques du modèle de Hubbard, comme le poids spectral obtenu en prolongeant analytiquement les données Monte Carlo calculées en temps imaginaire. Pour cette section du rapport, nous présentons quelques éléments de la théorie de la régularisation et la méthode d'entropie maximum utilisés pour résoudre le problème numériquement mal posé que constitue le prolongement analytique des données Monte Carlo. Finalement, pour rendre ce rapport complet en soi, nous avons inclut en annexe une introduction à quelques outils d'analyse numérique ainsi qu'un guide de lecture renvoyant à des références de base sur la plupart des sujets traités dans ce rapport.}, Author = {Hugo Touchette and David Poulin}, Date-Added = {2008-04-23 13:58:54 -0700}, Date-Modified = {2010-05-06 14:07:54 -0400}, Institution = {Université de Sherbrooke}, Keywords = {Condensed matter; Many-Body; Simulation}, Local-Url = {TP00aa.pdf}, Title = {Aspects num{\'e}riques des simulations du modèle de Hubbard --- {M}omte {C}arlo quantique et méthode d'entropie maximum}, Year = {2000}} @ARTICLE{Reulet20002829, author = {Reulet, B., Kasumov, A.Yu., Kociak, M., Deblock, R. , Khodos, I.I., Gorbatov, Yu.B., Volkov, V.T., Journet, C., Bouchiat, H.}, title = {Acoustoelectric effects in carbon nanotubes}, journal = {Physical Review Letters}, year = {2000}, volume = {85}, number = {13}, pages = {2829-2832}, note = {cited By (since 1996) 57}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0034714652&partnerID = 40&md5 = 4daf34eecc42515583bcad5ce4576373}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405, Orsay, France; Inst. Microlectron. Technol. High P., Russian Academy of Sciences, Chernogolovka 142432, Russian Federation; Grp. Dynamique des Phases Condensees, Université Montpellier II, 34095 Montpellier, France}, abstract = {The acoustoelectric effects in a rope made of a small number of single walled carbon nanotubes (SWNT) were examined. The SWNT rope forms a suspended bridge between two metallic contacts. Stationary sound waves were excited by applying a radiofrequency electromagnetic field to the tubes. The changes in sound waves were detected by measuring the differences in the dc resistance of the tubes in certain temperature dependence conditions. Depending on the excitation power, the vibrations produce either electron heating or phase coherence breaking.}, document_type = {Article}, source = {Scopus}} @article{MAL+00a, Abstract = {The opening of a critical-fluctuation induced pseudogap (or precursor pseudogap) in the one-particle spectral weight of the half-filled two-dimensional Hubbard model is discussed. This pseudogap, appearing in our Monte Carlo simulations, may be obtained from many-body techniques that use Green functions and vertex corrections that are at the same level of approximation. Self-consistent theories of the Eliashberg type (such as the Fluctuation Exchange Approximation) use renormalized Green functions and bare vertices in a context where there is no Migdal theorem. They do not find the pseudogap, in quantitative and qualitative disagreement with simulations, suggesting these methods are inadequate for this problem. Differences between precursor pseudogaps and strong-coupling pseudogaps are also discussed.}, Author = {S. Moukouri, S. Allen, F. Lemay and B. Kyung and D. Poulin and Y. M. Vilk and and A.-M. S. Tremblay}, Date-Added = {2006-01-06 10:57:21 +1000}, Date-Modified = {2010-05-06 14:07:27 -0400}, Eprint = {cond-mat/990853}, Journal = {Phys. Rev. B}, Keywords = {Simulation; Condensed matter; Many-Body}, Local-Url = {MAL+00a.pdf}, Pages = {7887}, Title = {Many-body theory versus simulations for the pseudogap in the Hubbard model}, Volume = {61}, Year = {2000}} @article{Zozoulenko2000409, Abstract = {Magnetoconductance of a small open lateral dot is studied both theoretically and experimentally for the conditions when the dot contains down to approximately 15 electrons. We confirm the existence of a new regime for open dots in which the transport through the structure occurs through individual eigenstates of the corresponding closed dot. In particular, at low magnetic fields the characteristic features in the conductance are related to the underlying eigenspectrum shells. When the number of modes in the leads is reduced more detailed structures within the shells due to single eigenlevels becomes discernible. At higher fields Landau level condensation is evident as well as the crossing of levels collapsing to the different Landau levels.}, Author = {Zozoulenko, I.V. and Sachrajda, A.S. and Gould, C. and Berggren, K.-F. and Zawadzki, P. and Feng, Y. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1}, Pages = {409-413}, Source = {Scopus}, Title = {Magnetoconductance of a few-electron open quantum dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034139201&partnerID=40&md5=0031943e389f14e8c90c82c16626d4ba}, Volume = {6}, Year = {2000}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034139201&partnerID=40&md5=0031943e389f14e8c90c82c16626d4ba}} @article{Feng19993231, Abstract = {Two different electron sensitive polymers, polymethylglutarimide and polymethylmethacrylate were employed to form submicron Au airbridges for use in mesoscopic devices. A series of test devices was fabricated in which this technique was used to make electrical contact to a submicron elliptical gate placed within a quantum point contact. The airbridge was patterned by electron beam lithography and metal lift-off. Conductance measurements were performed on the devices at low magnetic fields. The results confirmed both the presence of the elliptical antidot as a negative voltage was applied to the center gate, as well as the nonintrusive nature of the airbridge. {\copyright} 1999 American Vacuum Society.}, Author = {Feng, Y. and Sachrajda, A.S. and Zawadzki, P. and Kolind, S. and Buchanan, M. and Smet, J.H. and Lapointe, J. and Marshall, P.A.}, Document_Type = {Article}, Journal = {Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures}, Number = {6}, Pages = {3231-3234}, Source = {Scopus}, Title = {Fabrication of tunable antidot structures with submicron airbridges}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0033273252&partnerID=40&md5=1cb8d7c2bd85ef60ef94dfc5d2c03a98}, Volume = {17}, Year = {1999}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0033273252&partnerID=40&md5=1cb8d7c2bd85ef60ef94dfc5d2c03a98}} @article{Hawrylak19992801, Abstract = {We present results of calculations and "lateral" magnetotunneling experiments on small quantum dots in the few-electron regime. In the transition from a spin-unpolarized to a spin-polarized droplet, a systematic oscillation of the chemical potential of the droplet as a function of the magnetic field correlates with oscillations in the current amplitude. The temperature dependence of the current minima indicates that the minima are associated with the collapse of the Zeeman gap in the quantum Hall droplet. The collapse of the Zeeman gap is associated with the nontrivial magnetic field dependence of the spin polarization of a quantum Hall droplet due to electronic correlations. {\copyright}1999 The American Physical Society.}, Author = {Hawrylak, P. and Gould, C. and Sachrajda, A. and Feng, Y. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {4}, Pages = {2801-2806}, Source = {Scopus}, Title = {Collapse of the Zeeman gap in quantum dots due to electronic correlations}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001754938&partnerID=40&md5=32510dc3f5eb98109cc7e7e008a21384}, Volume = {59}, Year = {1999}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001754938&partnerID=40&md5=32510dc3f5eb98109cc7e7e008a21384}} @ARTICLE{Kasumov1999933, author = {Kasumov, A., Deblock, R., Kociak, M., Reulet, B., Bouchiat, H., Khodos, I., Gorbatov, Y., Volkov, V., Journet, C., Stephan, O., Burghard, M.}, title = {Proximity-induced superconductivity in carbon nanotubes}, journal = {Comptes Rendus de l'Academie de Sciences - Serie IIb: Mecanique, Physique, Chimie, Astronomie}, year = {1999}, volume = {327}, number = {9}, pages = {933-943}, note = {cited By (since 1996) 0}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0033198540&partnerID = 40&md5 = 495647c360f66637e8714ed4d78f0884}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, bât. 510, 91405 Orsay, France; Inst. of Microelectronics Technology, Russian Academy of Sciences, Chernogolovka 142432, Moscow Region, Russian Federation; Grp. de Dynam. des Phases Condensees, Université Montpellier-II, 34095 Montpellier, France; Max-Plank Institute, 70506 Stuttgart, Germany}, abstract = {Single wall carbon nanotubes (SWNT) are model systems for the study of electronic transport in one-dimensional conductors. They are expected to exhibit strong electronic correlations and non-Fermi liquid behavior as suggested by recent experiments. The possibility to induce supercurrents through such molecular wires is a challenging question both for experimentalists and theoreticians. In this paper we show experimental evidence of induced superconductivity in a SWNT. This proximity effect is observed in a single 1 nm diameter SWNT, in individual cristalline ropes containing about 100 nanotubes and also on multiwalled tubes. These samples are suspended as strings between two superconducting electrodes (double layer Au-Re, Au-Ta or Sn film) at a distance varying between 100 and 2 000 nm. This allows their structural study in a transmission electron microscope. When their resistance is low enough, SWNT become superconducting with surprisingly high critical currents (in the micro-Ampere range for a single tube of normal state resistance 25 kΩ). This critical current, extensively studied as function of temperature and magnetic field, exhibits unusual features which are not observed in conventional Superconducting-Normal-Superconducting junctions and can be related to the strong 1D character of these samples. We also show evidence of a huge sensitivity of dc transport properties of the tubes to electromagnetic radiation in the radio-frequency range.}, author_keywords = {Carbon nanotubes; Mesoscopic superconductivity; Proximity effect}, document_type = {Article}, source = {Scopus}} @ARTICLE{Kasumov19991508, author = {Kasumov, A.Yu., Deblock, R., Kociak, M., Reulet, B., Bouchiat, H., Khodos, I.I., Gorbatov, Yu.B., Volkov, V.T., Journet, C., Burghard, M.}, title = {Supercurrents through single-wailed carbon nanotubes}, journal = {Science}, year = {1999}, volume = {284}, number = {5419}, pages = {1508-1511}, note = {cited By (since 1996) 258}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0033612023&partnerID = 40&md5 = 86301b2ad91d6c055e5a7132b9711e3a}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405, Orsay, France; Inst. Microlectron. Technol. High P., Russian Academy of Sciences, Chernogolovka 142432 Moscow Region, Russian Federation; Grp. Dynamique des Phases Condensees, Université Montpellier II, 34095 Montpellier, France; Max-Planck-Institute, D-70506 Stuttgart, Germany}, abstract = {Proximity-induced superconductivity in single-walled carbon nanotubes below 1 kelvin, both in a single tube 1 nanometer in diameter and in crystalline ropes containing about 100 nanotubes, was observed. The samples were suspended between two superconducting electrodes, permitting structural study in a transmission electron microscope. When the resistance of the nanotube junction is sufficiently low, it becomes superconducting and can carry high supercurrents. The temperature and magnetic field dependence of the critical current of such junctions exhibits unusual features related to their strong one-dimensional character.}, document_type = {Article}, source = {Scopus}} @ARTICLE{Noat1999187, author = {Noat, Y., Reulet, B., Bouchiat, H., Mailly, D.}, title = {Signature of phase coherence in mesoscopic systems}, journal = {Physica A: Statistical Mechanics and its Applications}, year = {1999}, volume = {263}, number = {1-4}, pages = {187-196}, note = {cited By (since 1996) 0}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-9744221999&partnerID = 40&md5 = 6b22f7647add512ffbdb360b50a75e23}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405, Orsay, France; C.N.R.S Lab. Microstructures M., 196, Avenue Ravera, 92220, Bagneux, France}, abstract = {At low temperature, electronic wave functions in a metal keep their phase coherence on a length Lφ which can be of the order of few microns. Transport and thermodynamic properties of mesoscopic systems whose size are smaller than Lφ exhibit spectacular signatures of this coherence which can be revealed by instance through the sensitivity of the phase of the electrons to an applied vector potential. These quantum effects crucially depend on the way measurements are performed, in this paper we emphasize the difference between: - Connected open systems, characterized by their transmission properties accessible through conductance measurements. - Isolated closed systems characterized by their energy level spectra and investigated through thermodynamic (mostly magnetization) and ac conductance (response to an electromagnetic wave) measurements. They correspond to different types of coupling to the measuring apparatus, and present different sensitivities to phase coherence. The amplitude of quantum oscillations of the magnetoconductance on a connected system are indeed only a small fraction of the classical conductance and can much larger on an isolated system.}, document_type = {Article}, source = {Scopus}} @article{Ouchterlony1999361, Abstract = {We study the conductance of a square quantum dot, modeling the potential with a self-consistent Thomas-Fermi approximation. The resulting potential is characterized by level statistics indicative of mixed chaotic and regular electron dynamics within the dot in spite of the regular geometry of the gates defining the dot. We calculate numerically, for the case of a quantum dot with soft confinement, the weak localization (WL) correction. We demonstrate that this confining potential may generate either Lorentzian or linear lineshapes depending on the number of modes in the leads. Finally, we present experimental WL data for a lithographically square dot and compare the results with numerical calculations. We analyze the experimental results and numerical simulations in terms of semiclassical and random matrix theory (RMT) predictions and discuss their limitations as far as real experimental structures are concerned. Our results indicate that direct application of the above predictions to distinguish between chaotic and regular dynamics in a particular cavity can not always lead to reliable conclusions as the shape and magnitude of the WL correction can be strongly sensitive to the geometry-specific, non-universal features of the system.}, Author = {Ouchterlony, T. and Zozoulenko, I.V. and Wang, C.-K. and Berggren, K.-F. and Gould, C. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {European Physical Journal B}, Number = {2}, Pages = {361-370}, Source = {Scopus}, Title = {Quantum corrections to the conductance of a square quantum dot with soft confinement}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001506759&partnerID=40&md5=34140f9f3073d71e60aba9dca709f424}, Volume = {10}, Year = {1999}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001506759&partnerID=40&md5=34140f9f3073d71e60aba9dca709f424}} @conference{Sachrajda199916, Abstract = {Recently vertical quantum dots containing just a few electrons have been fabricated and studied. The long sought after "artificial atom" nature of these dots was confirmed in these dramatic experiments. In this paper, however, we describe the fabrication of a lateral few electron quantum dot defined by electrostatic gates over a high mobility 2DEG. We present some of the spectroscopic measurements we have performed on these dots and use them to confirm that the number of electrons in the dot lies between 10 and 20.}, Author = {Sachrajda, A.S. and Gould, C. and Hawrylak, P. and Feng, Y. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physica Scripta T}, Pages = {16-19}, Source = {Scopus}, Title = {A Lateral Few Electron Dot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0347939545&partnerID=40&md5=0cfdec2b3b45fac348ee5bccedab98d9}, Volume = {79}, Year = {1999}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0347939545&partnerID=40&md5=0cfdec2b3b45fac348ee5bccedab98d9}} @article{Sachrajda1999639, Abstract = {We have performed single electron spectroscopy experiments on single lateral quantum dots. We demonstrate that the lateral nature of the tunneling as well as the properties of the 2DEG leads can be used to extract new information in the 'spin-flip' regime. Calculations confirm that one needs to go beyond the Hartree-Fock approximation and include correlation effects to explain the experimental observations. The results are found to be consistent with the presence of spin depolarization events at the 'spin-flips'.}, Author = {Sachrajda, A.S. and Gould, C. and Hawrylak, P. and Feng, Y. and Zawadzki, P. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Brazilian Journal of Physics}, Number = {4}, Pages = {639-642}, Source = {Scopus}, Title = {Spin depolarization in quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0033235696&partnerID=40&md5=30f39e9c609e5a957d8843eb11c96d37}, Volume = {29}, Year = {1999}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0033235696&partnerID=40&md5=30f39e9c609e5a957d8843eb11c96d37}} @article{Zozoulenko19991838, Abstract = {We confirm the existence of a new regime for small few-electron open dots, in which the transport occurs through individual eigenstates of the corresponding closed dot. In particular, at low magnetic fields the characteristic features in the conductance are related to the underlying eigenspectrum shells. When the number of modes in the leads is reduced, a more detailed structure becomes discernible within the shells due to single eigenlevels. At higher fields Landau level condensation is evident as well as the crossing of levels collapsing to different Landau levels. {\copyright} 1999 The American Physical Society.}, Author = {Zozoulenko, I.V. and Sachrajda, A.S. and Gould, C. and Berggren, K.-F. and Zawadzki, P. and Feng, Y. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {9}, Pages = {1838-1841}, Source = {Scopus}, Title = {Few-electron open dots: Single level transport}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000261485&partnerID=40&md5=1639d827c39d90242919189acfe955ec}, Volume = {83}, Year = {1999}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000261485&partnerID=40&md5=1639d827c39d90242919189acfe955ec}} @article{Gould1998141, Abstract = {We have fabricated few electron lateral dots containing between 10 and 20 electrons. Single electron spectroscopic techniques have been used to investigate the regime between v = 2 and v = 1, i.e., the transition from a spin unpolarized quantum dot to a spin polarized quantum dot. We compare the experimental results to non-interacting, Hartree-Fock and exact diagonalization calculations. The comparison confirms that correlations are important in this regime. Spinflips are found to be complex and rich phenomena involving a nontrivial spin polarization dependence on magnetic field and a resulting collapse of the Zeeman gap due to electronic correlations. {\copyright} 1998 Elsevier Science B. V. All rights reserved.}, Author = {Gould, C. and Hawrylak, P. and Sachrajda, A.S. and Feng, Y. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physica B: Condensed Matter}, Pages = {141-146}, Source = {Scopus}, Title = {Transport spectroscopy of lateral few electron quantum dots in a magnetic field}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0347569880&partnerID=40&md5=b1624641becac467b2b2f33cde54f22e}, Volume = {256-258}, Year = {1998}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0347569880&partnerID=40&md5=b1624641becac467b2b2f33cde54f22e}} @ARTICLE{Kasumov199889, author = {Kasumov, A.Yu., Bouchiat, H., Reulet, B., Stephan, O., Khodos, I.I., Gorbatov, Yu.B., Colliex, C.}, title = {Conductivity and atomic structure of isolated multiwalled carbon nanotubes}, journal = {Europhysics Letters}, year = {1998}, volume = {43}, number = {1}, pages = {89-94}, note = {cited By (since 1996) 55}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0032121485&partnerID = 40&md5 = 8dc45e873f3ea7f076c5adb3d4622d42}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405, Orsay, France; Inst. Microlectron. Technol. High P., Russian Academy of Sciences, Chernogolovka 142432, Russian Federation; Lab. Aime Cotton (UPR CNRS 3321), Bât. 505, Université Paris-Sud, 91405, Orsay, France}, abstract = {We report associated high-resolution transmission electron microscopy (HRTEM) and transport measurements on a series of isolated multiwalled carbon nanotubes. HRTEM observations, by revealing relevant structural features of the tubes, shed some light on the variety of observed transport behaviors, from semiconducting to quasi-metallic type. Non-Ohmic behavior is observed for certain samples which exhibit "bamboo-like" structural defects. The resistance of the most conducting sample exhibits a pronounced maximum at 0.6 K and strong positive magnetoresistance.}, document_type = {Article}, source = {Scopus}} @ARTICLE{Noat19984955, author = {Noat, Y., Bouchiat, H., Reulet, B., Mailly, D.}, title = {Sign reversals of AC magnetoconductance in isolated quantum dots}, journal = {Physical Review Letters}, year = {1998}, volume = {80}, number = {22}, pages = {4955-4958}, note = {cited By (since 1996) 5}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0032097326&partnerID = 40&md5 = 897cfb75b8ffd1d9ed427e7876e5aa93}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405 Orsay, France; CNRS Lab. Microstructures M., 196 Avenue Ravera, 92220 Bagneux, France}, abstract = {We have measured the electromagnetic response of micron-size isolated GaAs/GaAlAs square dots down to 16 mK by coupling them to a microresonator. Both dissipative and reactive responses exhibit a large magnetic field dependent quantum correction, with a characteristic flux scale corresponding to a flux quantum in a dot. The dissipative magnetoconductance changes sign as a function of frequency for a low density of electrons. The signal observed at a frequency below the mean level spacing corresponds to a negative magnetoconductance, in contrast to weak localization in connected systems, and becomes positive at higher frequencies. We interpret this phenomenon in relation to the energy spectrum statistics in the dots.}, document_type = {Article}, source = {Scopus}} @ARTICLE{Noat1998621, author = {Noat, Y., Reulet, B., Bouchiat, H., Mailly, D.}, title = {AC magnetoconductance of isolated mesoscopic systems}, journal = {Superlattices and Microstructures}, year = {1998}, volume = {23}, number = {3-4}, pages = {621-634}, note = {cited By (since 1996) 4}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0031651474&partnerID = 40&md5 = 023c22fba54ea8ce9b84e64b7cd7413c}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405, Orsay, France; C.N.R.S. Lab. Microstructures M., 196, Avenue Ravera, 92220, Bagneux, France}, abstract = {We have measured dissipative (real) and non-dissipative (imaginary) magneto-conductance of arrays of disconnected GaAs-GaAlAs mesoscopic rings and square dots in the MHz-GHz range. The samples are coupled to a highly sensitive electromagnetic multimode superconducting micro-resonator and lead to a perturbation of the resonance frequency and quality factor. This experiment provides a tool for the investigation of the conductance of mesoscopic sytems without any connection to invasive probes. It can be confronted with recent theoretical predictions emphasizing the differences between isolated and connected geometries and the relation between ac conductance, orbital magnetism and electrical polarisability. The magneto-conductance measured is dominated by its imaginary component whose sign (corresponding to diamagnetism in zero field) and amplitude are analysed and compared to theoretical predictions on persistent currents and magneto-polarisability. The real component of the magneto-conductance is very different from the weak localisation signals observed in similar connected samples. It changes sign from positive to negative when increasing electronic density and frequency. We propose an interpretation of this phenomenon in relation to fundamental properties of energy level spacing statistics in the dots. 1998 Academic Press Limited.}, author_keywords = {ac conductance; Electrical polanisability; Mesoscopic systems; Peristent currents}, document_type = {Article}, source = {Scopus}} @article{Sachrajda1998248, Abstract = {A tunable two-antidot device is studied in the cyclotron-trapping regime. Periodic quantum oscillations are found to be superimposed on the peaks reminiscent of those observed in antidot lattices. The results are compared to quantum and classical simulations and Feynman path integral analysis. Published by Elsevier Science B.V.}, Author = {Sachrajda, A.S. and Gould, C. and Kirczenow, G. and Johnson, B. and Feng, Y. and Kelly, P.J. and Delage, A.}, Document_Type = {Article}, Journal = {Physica E: Low-Dimensional Systems and Nanostructures}, Number = {1-4}, Pages = {248-253}, Source = {Scopus}, Title = {The two-antidot system in the ballistic regime}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0346856576&partnerID=40&md5=7bec92969c52939851890ed943525b19}, Volume = {1}, Year = {1998}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0346856576&partnerID=40&md5=7bec92969c52939851890ed943525b19}} @article{Sachrajda19981948, Abstract = {Conductance fluctuations have been studied in a soft-wall stadium and a Sinai billiard defined by electrostatic gates on a high mobility semiconductor heterojunction. These reproducible magnetoconductance fluctuations are found to be fractal, confirming recent theoretical predictions of quantum signatures in classically mixed (regular and chaotic) systems. The fractal character of the fluctuations provides direct evidence for a hierarchical phase space structure at the boundary between regular and chaotic motion.}, Author = {Sachrajda, A.S. and Ketzmerick, R. and Gould, C. and Feng, Y. and Kelly, P.J. and Delage, A. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {9}, Pages = {1948-1951}, Source = {Scopus}, Title = {Fractal conductance fluctuations in a soft-wall stadium and a sinai billiard}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000092535&partnerID=40&md5=1a05be5a787783aa535d790c7f9ce304}, Volume = {80}, Year = {1998}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000092535&partnerID=40&md5=1a05be5a787783aa535d790c7f9ce304}} @article{Taylor1998337, Abstract = {We investigate the mechanism by which annealed Ni-Au-Ge metallizations establish electrical contact to the two-dimensional electron gas (2DEG) in AlGaAs/GaAs heterostructures and we assess the suitability of this contact process for defining patterned contacts in semi-conductor nanostructures. We present a picture where electrons are injected from an array of spikes which extend below the surface-metal pattern to penetrate the 2DEG and the associated quantum waves determine the contact resistance through phase-coherent interference processes at low temperatures. To probe this mesoscopic current injection process, we induce an evolution between two distinct geometries traditionally used to characterize semiconductor systems - the Corbino disc and the Hall bar. We also discuss refinements to the injection process which will facilitate the incorporation of shaped ohmic contacts into future nanostructure designs. {\copyright} 1998 Academic Press.}, Author = {Taylor, R.P. and Newbury, R. and Sachrajda, A.S. and Feng, Y. and Coleridge, P.T. and Davies, M. and McCaffrey, J.P.}, Document_Type = {Article}, Journal = {Superlattices and Microstructures}, Number = {5}, Pages = {337-345}, Source = {Scopus}, Title = {Investigation of the current injection properties of ohmic spikes in nanostructures}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0032303478&partnerID=40&md5=ceee955c04bada57345663198a7ffcb9}, Volume = {24}, Year = {1998}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0032303478&partnerID=40&md5=ceee955c04bada57345663198a7ffcb9}} @article{Zozoulenko1998, Abstract = {The fluctuations of a square quantum dot have been studied as a function of the dot width. Measurements were made at magnetic fields ranging from the zero-field to edge-state regimes. The experimental results are compared with numerical quantum calculations and semiclassical periodic orbit theory. {\copyright} 1998 IOP Publishing Ltd.}, Author = {Zozoulenko, I.V. and Sachrajda, A.S. and Zawadzki, P. and Berggren, K.-F. and Feng, Y. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Semiconductor Science and Technology}, Number = {8 SUPPL. A}, Pages = {A7-A10}, Source = {Scopus}, Title = {The roles of leads and periodic orbits in the conductance fluctuations of high-mobility quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0343303035&partnerID=40&md5=0403ed346dc8d6e1336e27b04343071c}, Volume = {13}, Year = {1998}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0343303035&partnerID=40&md5=0403ed346dc8d6e1336e27b04343071c}} @article{Zozoulenko199810597, Abstract = {A systematic experimental and theoretical study has been performed on the conductance oscillations of a rectangular dot as a function of the dot width at different fixed magnetic fields (including zero field). We provide a semiclassical interpretation of the fluctuations at zero and very low magnetic fields (≲0.05 T) in terms of specific families of periodic orbits, which occur in a classical rectangular billiard. At higher magnetic fields (0.1≲B≲0.25 T) the fluctuations become more aperiodic with reduced amplitudes while the Fourier spectrum contains no significant peaks. With a further increase in the field the cyclotron orbit fits within the dot and now a single frequency dominates the fluctuations, which is consistent with the (semi)classical predictions in this field region. Finally, as the edge-state regime is reached, Aharonov-Bohm oscillations take over.}, Author = {Zozoulenko, I.V. and Sachrajda, A.S. and Zawadzki, P. and Berggren, K.-F. and Feng, Y. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {16}, Pages = {10597-10601}, Source = {Scopus}, Title = {Conductance fluctuations in a rectangular dot at constant magnetic fields}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001281391&partnerID=40&md5=ea3ed43b7286bb21a82636a28118395c}, Volume = {58}, Year = {1998}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001281391&partnerID=40&md5=ea3ed43b7286bb21a82636a28118395c}} @article{Coleridge1997755, Abstract = {Magnetotransport measurements in p-SiGe quantum well samples show that the Landau levels are ferromagnetically polarised at filling factor v = 2. It is also shown that the insulating phase observed in some samples at v = 1.5 is suppressed when the ferromagnetic polarisation persists into the v = 1 integer quantum Hall state. Similarities and differences between p-SiGe and high mobility Si-MOSFETs are also discussed. Crown copyright {\copyright} 1997 Published by Elsevier Science Ltd.}, Author = {Coleridge, P.T. and Sachrajda, A.S. and Zawadzki, P. and Williams, R.L. and Lafontaine, H.}, Document_Type = {Article}, Journal = {Solid State Communications}, Number = {10}, Pages = {755-758}, Source = {Scopus}, Title = {The hall insulator in 2-dimensional sige hole gases}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0031169081&partnerID=40&md5=f98acd451453f878e8f47a1ae623072a}, Volume = {102}, Year = {1997}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0031169081&partnerID=40&md5=f98acd451453f878e8f47a1ae623072a}} @article{Newbury19973991, Abstract = {We have investigated the geometry-induced magnetoresistance (MR) observed in a high mobility AlGaAs/GaAs electron billiard device. Our billiard is shaped by a surface gate arrangement incorporating a 'bridging interconnect' fabrication technique which allows independent control of the cavity's central circular antidot and evolution from a regular square to a nominally chaotic environment in a single device. The low field MR signature of the device displays a marked fractal form with MR structure on a magnetic field scale much finer than that previously reported for generically similar electron-wave billiards.}, Author = {Newbury, R. and Taylor, R.P. and Sachrajda, A.S. and Feng, Y. and Coleridge, P.T. and Dettmann, C. and Fromhold, T.M.}, Document_Type = {Article}, Journal = {Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers}, Number = {6 SUPPL. B}, Pages = {3991-3995}, Source = {Scopus}, Title = {Fractal behavior in the magnetoresistance of chaotic billiards}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-3643120985&partnerID=40&md5=17f03a9f723e3e559ce042fdbcd857e5}, Volume = {36}, Year = {1997}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-3643120985&partnerID=40&md5=17f03a9f723e3e559ce042fdbcd857e5}} @article{Raymond1997, Abstract = {We present the first radiative lifetime measurements and magneto-photoluminescence results of excited states in InGaAs/GaAs semiconductor self-assembled quantum dots. By increasing the photo-excitation intensity, excited state interband transitions up to n = 5 can be observed in the emission spectrum. The dynamics of the interband transitions and the inter-sublevel relaxation in these zero-dimensional energy levels lead to state-filling of the lower-energy states, allowing the quasi-Fermi level to be raised by more than 200 meV due to the combined large inter-sublevel spacing and the low density of states. The decay time of each energy level obtained under various excitation conditions is used to evaluate the inter-sublevel thermalization time. Finally, the emission spectrum of the dots filled with an average of about eight excitons is measured in magnetic fields up to 13 Tesla. The dependences of the spectrum as a function of carrier density and magnetic field are compared to calculations and interpreted in terms of coherent many-exciton states and their destruction by the magnetic field.}, Author = {Raymond, S. and Fafard, S. and Poole, P.J. and Wojs, A. and Hawrylak, P. and Gould, C. and Sachrajda, A. and Charbonneau, S. and Leonard, D. and Leon, R. and Petroff, P.M. and Merz, J.L.}, Document_Type = {Article}, Journal = {Superlattices and Microstructures}, Number = {4}, Pages = {XV-558}, Source = {Scopus}, Title = {State-filling and magneto-photoluminescence of excited states in InGaAs/GaAs self-assembled quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-30244528861&partnerID=40&md5=7bb7c25666922c323e1c5324aaf26685}, Volume = {21}, Year = {1997}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-30244528861&partnerID=40&md5=7bb7c25666922c323e1c5324aaf26685}} @article{Raymond1997541, Abstract = {We present the first radiative lifetime measurements and magneto-photoluminescence results of excited states in InGaAs/GaAs semiconductor self-assembled quantum dots. By increasing the photo-excitation intensity, excited state interband transitions up to n = 5 can be observed in the emission spectrum. The dynamics of the interband transitions and the inter-sublevel relaxation in these zero-dimensional energy levels lead to state-filling of the lower-energy states, allowing the quasi-Fermi level to be raised by more than 200 meV due to the combined large inter-sublevel spacing and the low density of states. The decay time of each energy level obtained under various excitation conditions is used to evaluate the inter-sublevel thermalization time. Finally, the emission spectrum of the dots filled with an average of about eight excitons is measured in magnetic fields up to 13 Tesla. The dependences of the spectrum as a function of carrier density and magnetic field are compared to calculations and interpreted in terms of coherent many-exciton states and their destruction by the magnetic field.}, Author = {Raymond, S. and Fafard, S. and Poole, P.J. and Wojs, A. and Hawrylak, P. and Gould, C. and Sachrajda, A. and Charbonneau, S. and Leonard, D. and Leon, R. and Petroff, P.M. and Merz, J.L.}, Document_Type = {Article}, Journal = {Superlattices and Microstructures}, Number = {4}, Pages = {541-558}, Source = {Scopus}, Title = {State-filling and magneto-photoluminescence of excited states in InGaAs/GaAs self-assembled quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030707088&partnerID=40&md5=fdf87e2da258bbd654fc75fa8addbf69}, Volume = {21}, Year = {1997}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030707088&partnerID=40&md5=fdf87e2da258bbd654fc75fa8addbf69}} @article{Raymond1997883, Abstract = {The emission spectrum of self-assembled InGaAs/GaAs quantum dots filled with up to 10 excitons is measured in magnetic fields up to 13 Tesla. The spectrum shows a number of peaks which split and rearrange with the magnetic field. The behaviour of the spectrum with carrier density and magnetic field is compared with detailed calculations. The model allows us to interpret our results in terms of coherent many-exciton states and their destruction by the magnetic field. The level structure of the spectra is related to the shell structure and collective excitations of many-exciton droplets in these artificial atoms. {\copyright} 1997 Published by Elsevier Science Ltd. All rights reserved.}, Author = {Raymond, S. and Hawrylak, P. and Gould, C. and Fafard, S. and Sachrajda, A. and Potemski, M. and Wojs, A. and Charbonneau, S. and Leonard, D. and Petroff, P.M. and Merz, J.L.}, Document_Type = {Article}, Journal = {Solid State Communications}, Number = {12}, Pages = {883-887}, Source = {Scopus}, Title = {Exciton droplets in zero dimensional systems in a magnetic field}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0031102677&partnerID=40&md5=55dcb1d62b6e89deac66a6e4f38c1be6}, Volume = {101}, Year = {1997}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0031102677&partnerID=40&md5=55dcb1d62b6e89deac66a6e4f38c1be6}} @article{Taylor19971952, Abstract = {We investigate the transition to a Sinai geometry by introducing a circular pattern at the center of a square mesoscopic billiard defined in a high quality AlGaAs/GaAs crystal. The transition induces a novel quantum interference structure in the magnetoresistance with a characteristic field scale over an order of magnitude smaller than previously reported in mesoscopic billiards. A systematic comparison of fine and coarse structures, which differ by an order of magnitude in field scale, demonstrates the first observation of geometry-induced "self-similarity" in the magnetoresistance of a semiconductor system.}, Author = {Taylor, R.P. and Newbury, R. and Sachrajda, A.S. and Feng, Y. and Coleridge, P.T. and Dettmann, C. and Zhu, N. and Guo, H. and Delage, A. and Kelly, P.J. and Wasilewski, Z.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {10}, Pages = {1952-1955}, Source = {Scopus}, Title = {Self-similar magnetoresistance of a semiconductor sinai billiard}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000644192&partnerID=40&md5=a152fcc76bfc8963aafb2944c352b63c}, Volume = {78}, Year = {1997}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000644192&partnerID=40&md5=a152fcc76bfc8963aafb2944c352b63c}} @article{Taylor19973964, Abstract = {We investigate a system defined by an array of metallic spikes which extend down from an annealed Ni-AuGe metallisation deposited on the surface of an AlGaAs/GaAs heterostructure. For the case where the spikes penetrate the two dimensional gas (2DEG), we show that electrons injected from the spikes into the 2DEG maintain phase coherence at low temperatures, resulting in quantum interference processes determined by the spike distribution. A unique device which induces a topological transition from a Corbino disc to a Hall bar is employed to explore this novel phenomenon. We discuss refinements to the spiking process which will facilitate the incorporation of these metallic spikes into nanostructure designs.}, Author = {Taylor, R.P. and Newbury, R. and Sachrajda, A.S. and Feng, Y. and Coleridge, P.T. and McCaffrey, J.P. and Davies, M. and Bird, J.P.}, Document_Type = {Article}, Journal = {Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers}, Number = {6 B}, Pages = {3964-3967}, Source = {Scopus}, Title = {Can ohmic spikes define quantum systems?}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-19044380282&partnerID=40&md5=032d534882a158908034ae24e4a5e58f}, Volume = {36}, Year = {1997}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-19044380282&partnerID=40&md5=032d534882a158908034ae24e4a5e58f}} @conference{Coleridge1996414, Abstract = {A brief survey is given of ways SiGe alloys can be integrated into microelectronic devices. The growth of a series of modulation doped p-type strained Si.88Ge.12 quantum wells is described and the results of characterization using low temperature magnetotransport presented. Comments are also made about the appearance, in some samples, of an insulating phase at low temperatures.}, Author = {Coleridge, P.T. and Feng, Y. and Lafontaine, H. and Sachrajda, A.S. and Williams, R. and Zawadzki, P.}, Document_Type = {Conference Paper}, Journal = {Conference on Optoelectronic & Microelectronic Materials and Devices, Proceedings, COMMAD}, Pages = {414-421}, Source = {Scopus}, Title = {Magnetotransport properties of p-type strained SiGe quantum wells}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030360119&partnerID=40&md5=f0a07320e037e9ec1c4918df5636a42d}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030360119&partnerID=40&md5=f0a07320e037e9ec1c4918df5636a42d}} @article{Coleridge1996560, Abstract = {Effective masses derived from the low-field Shubnikov-de Haas oscillations in high mobility GaAs/AlGaAs samples are found to decrease systematically with density. Measurements in a low-density sample show the temperature dependence does not conform to standard theory. It is argued that this is to be expected when there is extra structure, in addition to the Landau levels, in the density of states. This may be important in interpreting measurements of composite fermion effective masses.}, Author = {Coleridge, P.T. and Hayne, M. and Zawadzki, P. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Surface Science}, Pages = {560-563}, Source = {Scopus}, Title = {Effective masses in high-mobility 2D electron gas structures}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030196908&partnerID=40&md5=142cb44c28825f03eccc455378700293}, Volume = {361-362}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030196908&partnerID=40&md5=142cb44c28825f03eccc455378700293}} @article{Coleridge199614518, Abstract = {Magnetotransport coefficients have been measured, at temperatures down to 30 mK, in a single-side p-doped Si0.88Ge0.12 strained quantum well. Odd filling factors dominate the transport, indicating a large g factor, and the coefficients are found to be extremely insensitive to the in-plane component of magnetic field. An effective mass of (0.305$\pm$0.01)m0 was deduced from the temperature dependence. The coefficients are discussed in terms of semiclassical transport theory. At low magnetic fields both longitudinal and Hall coefficients could be well explained in this way, in contrast to the situation in GaAs-based heterostructures. Small deviations from theory at higher fields are attributed to localization and Landau-level mixing effects.}, Author = {Coleridge, P.T. and Sachrajda, A.S. and Lafontaine, H. and Feng, Y.}, Document_Type = {Article}, Journal = {Physical Review B - Condensed Matter and Materials Physics}, Number = {20}, Pages = {14518-14523}, Source = {Scopus}, Title = {Magnetotransport coefficients in a two-dimensional SiGe hole gas}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000227626&partnerID=40&md5=d00eb34193bd5bbbf8135b95e1dff80b}, Volume = {54}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000227626&partnerID=40&md5=d00eb34193bd5bbbf8135b95e1dff80b}} @article{Gould1996, Abstract = {In this paper we describe a novel effect observed in a quantum wire containing two parallel "artificial" (i.e., electrostatically defined antidots) impurities. At low magnetic fields we observe a series of resistance peaks. These occur at magnetic fields for which classical electron trajectories are commensurate with the device geometry. The resistance peaks are modulated by periodic oscillations that can be observed both as a function of the applied magnetic field or the gate voltage, which controls the size of the impurities. These oscillations are analyzed in terms of the classical action of ballistic electrons on closed trajectories, the related phase gained along these trajectories, and the resulting quantum interference effect. We show that these oscillations when observed as a function of gate voltage are consistent with changes of the electron wavelength along part of the electron trajectory. The device conductance is thus being modulated by the electrostatic control of the electron phase.}, Author = {Gould, C. and Sachrajda, A. and Feng, Y. and Delage, A. and Kelly, P.J. and Coleridge, P.T.}, Document_Type = {Article}, Journal = {Canadian Journal of Physics}, Pages = {S207-S211}, Source = {Scopus}, Title = {Demonstration of device conductance modulation by electrostatic control of the electron phase}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0002295295&partnerID=40&md5=979364189dafbff2b39a3d8d0d7a5509}, Volume = {74}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0002295295&partnerID=40&md5=979364189dafbff2b39a3d8d0d7a5509}} @article{Gould19965272, Abstract = {The interaction of edge states via localized states leads to the "generic" breakdown of the quantum Hall effect. Using a versatile two-antidot structure we study the magnetoconductance oscillations of coupled antidot systems in regimes where "atomic" modes exist around individual antidots in addition to "molecular" modes encompassing both antidots. We find and discuss an apparent passivity of the molecular modes during both resonant transmission and reflection processes.}, Author = {Gould, C. and Sachrajda, A.S. and Dharma-wardana, M.W.C. and Feng, Y. and Coleridge, P.T.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {26}, Pages = {5272-5275}, Source = {Scopus}, Title = {"Spectator" modes and antidot molecules}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-4243325481&partnerID=40&md5=7c164947ed16a982d147508a460cc459}, Volume = {77}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-4243325481&partnerID=40&md5=7c164947ed16a982d147508a460cc459}} @conference{Newbury1996192, Abstract = {We examine the ohmic contact-semiconductor interface and the process of current injection in a high mobility GaAs/AlGaAs Corbino device. Magneto-transport measurements demonstrate that weak localization processes occur within the region of the 2DEG penetrated by the spike array formed on annealing of the ohmic contacts. These studies indicate that patterned ohmic contacts can provide a useful alternative to gated or etched sub-micron structures for fundamental mesoscopic physics investigations.}, Author = {Newbury, R. and Taylor, R.P. and Sachrajda, A.S. and Coleridge, P.T. and Feng, Y. and Davies, M. and McCaffrey, J.P.}, Document_Type = {Conference Paper}, Journal = {Conference on Optoelectronic & Microelectronic Materials and Devices, Proceedings, COMMAD}, Pages = {192-195}, Source = {Scopus}, Title = {Ohmic contact spike arrays for nanostructure device fabrication: Spike distribution and geometrical scattering of the electron-wave current}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030367338&partnerID=40&md5=704b1d365a7b87d5c4e484c2656b7beb}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030367338&partnerID=40&md5=704b1d365a7b87d5c4e484c2656b7beb}} @ARTICLE{Noat1996701, author = {Noat, Y., Reulet, B., Bouchiat, H.}, title = {Magneto-polarisability of mesoscopic rings}, journal = {Europhysics Letters}, year = {1996}, volume = {36}, number = {9}, pages = {701-706}, note = {cited By (since 1996) 14}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0030595921&partnerID = 40&md5 = 8a0ad4568dc52eebb46e7a97935e9f12}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405, Orsay, France}, abstract = {We calculate the average polarisability of two-dimensional mesoscopic rings in the presence of an Aharonov-Bohm flux. The screening is taken into account self-consistently within a mean-field approximation. We investigate the effects of statistical ensemble, finite frequency and disorder. We emphasize geometrical effects which make the observation of field-dependent polarisability much more favourable on rings than on disks or spheres of comparable radius. The ratio of the flux-dependent to the flux-independent part is estimated for typical GaAs rings.}, document_type = {Article}, source = {Scopus}} @article{Sachrajda19963019, Abstract = {We have measured the magnetoresistance of a variety of structures to search for effects associated with composite fermions (CF) near the Landau filling factor v = 1/2. We find evidence for effects due to randomization of semiclassical ballistic CF trajectories. These produce magnetoresistance features similar to those observed near zero magnetic field. However, we were not able to reproduce the recent CF magnetic focusing experiment despite using devices of very similar quality to those used in the original experiment. We also searched, without success, for phenomena due to phase coherence of CF. The relative ease with which the various magnetoresistance effects are seen in CF is discussed, in part with the aid of semiclassical simulations. It is discovered that inhomogeneities of carrier density cause the magnetoresistance anomalies to be smeared out, largely as a result of spatial variations in the effective magnetic field experienced by the CF. We find also that experiments which are based on randomization of trajectories are more resilient to this spatial variation.}, Author = {Sachrajda, A. and Feng, Y. and Delage, A. and Kelly, P. and Carmona, H. and Main, P.C. and Eaves, L.}, Document_Type = {Article}, Journal = {Journal of Physics Condensed Matter}, Number = {17}, Pages = {3019-3032}, Source = {Scopus}, Title = {Investigations of composite fermions in semiconductor nanostructures}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030127784&partnerID=40&md5=9b1bf0be9978d24f31cdf96673373a01}, Volume = {8}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030127784&partnerID=40&md5=9b1bf0be9978d24f31cdf96673373a01}} @article{Sachrajda199659, Abstract = {We have measured the magnetoresistance of quantum wires, junctions and rings near Landau filling factor ν = 1/2 to search for effects due to composite fermions (CF). We find evidence for semi-classical ballistic effects in the CF which are similar to those seen near zero magnetic field. However, we were not able to observe effects due to the phase coherence of the CF, even where their analogues were apparent in the electron transport. We attribute this to sample inhomogeneity.}, Author = {Sachrajda, A.S. and Feng, Y. and Carmona, H.A. and Geim, A.K. and Main, P.C. and Eaves, L. and Foxon, C.T.}, Document_Type = {Article}, Journal = {Surface Science}, Pages = {59-62}, Source = {Scopus}, Title = {Mesoscopic transport properties of composite fermions}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030190156&partnerID=40&md5=6d39d8ff5783774abf02960efb770674}, Volume = {361-362}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030190156&partnerID=40&md5=6d39d8ff5783774abf02960efb770674}} @article{Sachrajda1996655, Abstract = {We have fabricated a device which can be transformed from a Corbino to a two terminal Hall bar geometry by the activation of a single electrostatic gate. The behaviour in the Hall bar mode is both quantitatively and qualitatively in disagreement with predictions of the Landauer-Buttiker formula. The origin of the disagreement relates to the 'ideal contact' assumption implicit in the Landauer-Buttiker formula which breaks down under the novel conditions of this experiment. {\copyright} 1996 Academic Press Limited.}, Author = {Sachrajda, A.S. and Feng, Y. and Taylor, R.P. and Newbury, R. and Coleridge, P.T. and Mccaffrey, J.P.}, Document_Type = {Article}, Journal = {Superlattices and Microstructures}, Number = {4}, Pages = {655-656}, Source = {Scopus}, Title = {The topological transition from a Corbino to Hall bar geometry}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030413353&partnerID=40&md5=95933e1bed1af47ee0f7fdc9b046a168}, Volume = {20}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030413353&partnerID=40&md5=95933e1bed1af47ee0f7fdc9b046a168}} @article{Sachrajda1996627, Abstract = {Transport measurements have been made through the bound states of two parallel antidots in a quantum wire in the edge state regime. The results are compared with a non-interacting independent-electron model. The experimental results are consistent with the model but only above a certain magnetic field (∼ 1.5 T).}, Author = {Sachrajda, A.S. and Gould, C. and Feng, Y. and Dharma-Wardana, M.W.C. and Coleridge, P.T.}, Document_Type = {Article}, Journal = {Surface Science}, Pages = {627-630}, Source = {Scopus}, Title = {Tunnelling experiments through coupled zero-dimensional systems}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030189398&partnerID=40&md5=2c297e9ceb42ea21d09c0a7b6e63f26f}, Volume = {361-362}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030189398&partnerID=40&md5=2c297e9ceb42ea21d09c0a7b6e63f26f}} @article{Taylor19961189, Abstract = {Weak localization, a semiclassical process established in disordered systems, has recently been used as an experimental probe of the classical dynamics of ballistic cavities. Through a systematic study of the classical and quantum behaviour of three ballistic cavities featuring large width to length aspect ratios, we highlight the important role of the entrance and exit leads. We present a novel ballistic weak localization process in which the contributing classical trajectories pass directly between the entrance and exit leads and are not shaped by the walls of the cavity but purely by the profiles of the leads. This demonstration of a small section of a cavity supporting a 'local' weak localization process has important implications for studies which relate cavity geometry to the dynamics it supports.}, Author = {Taylor, R.P. and Newbury, R. and Sachrajda, A.S. and Coleridge, P.T. and Zawadzki, P. and Dunford, R.B. and Feng, Y. and Bird, J.P. and Leavens, C.R. and Cadogan, J.M. and Adams, J.A. and Kelly, P.J. and Davies, M. and Brown, S.A.}, Document_Type = {Article}, Journal = {Semiconductor Science and Technology}, Number = {8}, Pages = {1189-1197}, Source = {Scopus}, Title = {The use of wide ballistic cavities to investigate local weak localization processes induced by geometric scattering}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030206585&partnerID=40&md5=14b9200f4034387cb6c61d5e61b973cb}, Volume = {11}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030206585&partnerID=40&md5=14b9200f4034387cb6c61d5e61b973cb}} @conference{Taylor1996171, Abstract = {We describe a gate-defined semiconductor billiard which undergoes an evolution from a square to Sinai geometry. We report remarkable fractal behaviour observed in the magnetoresistance which emerges during the transition and originates from `quantum chaos' processes.}, Author = {Taylor, R.P. and Newbury, R. and Sachrajda, A.S. and Feng, Y. and Coleridge, P.T.}, Document_Type = {Conference Paper}, Journal = {Conference on Optoelectronic & Microelectronic Materials and Devices, Proceedings, COMMAD}, Pages = {171-174}, Source = {Scopus}, Title = {Tunable semiconductor Sinai billiards}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030370014&partnerID=40&md5=5a12d74ace1f2eee2f53bf810bb32297}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030370014&partnerID=40&md5=5a12d74ace1f2eee2f53bf810bb32297}} @article{Taylor1996296, Abstract = {A single device which can evolve between two distinctly different geometries is desirable for studies which relate a billiard's shape to the classical and semi-classical processes determining the magnetotransport properties of the device. We describe an evolution between a square and Sinai billiard and compare the observed transitions of both classical and quantum effects with those predicted from calculations. {\copyright} 1996 Academic Press Limited.}, Author = {Taylor, R.P. and Newbury, R. and Sachrajda, A.S. and Feng, Y. and Coleridge, P.T. and Delage, A. and Kelly, P.J. and Wasilewski, Z. and Zawadzki, P. and Zhu, N. and Guo, H.}, Document_Type = {Article}, Journal = {Superlattices and Microstructures}, Number = {3}, Pages = {296-305}, Source = {Scopus}, Title = {Geometry induced quantum interference: A continuous evoloution from square to Sinai billiard}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-30244443860&partnerID=40&md5=0d8912ef8da4ba3edc995d11e3c234ae}, Volume = {20}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-30244443860&partnerID=40&md5=0d8912ef8da4ba3edc995d11e3c234ae}} @article{Taylor1996297, Abstract = {A single device which can evolve between two distinctly different geometries is desirable for studies which relate a billiard's shape to the classical and semi-classical processes determining the magnetotransport properties of the device. We describe an evolution between a square and Sinai billiard and compare the observed transitions of both classical and quantum effects with those predicted from calculations.}, Author = {Taylor, R.P. and Newbury, R. and Sachrajda, A.S. and Feng, Y. and Coleridge, P.T. and Delage, A. and Kelly, P.J. and Wasilewski, Z. and Zawadzki, P. and Zhu, Ningjia and Guo, Hong}, Document_Type = {Article}, Journal = {Superlattices and Microstructures}, Number = {3}, Pages = {297-305}, Source = {Scopus}, Title = {Geometry induced quantum interference: a continuous evolution from square to Sinai billiard}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0029726611&partnerID=40&md5=5b2d956f4c75e75791ef0520dbbb3840}, Volume = {20}, Year = {1996}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0029726611&partnerID=40&md5=5b2d956f4c75e75791ef0520dbbb3840}} @article{Reulet1996AC, Year = {1996}, Abstract = {}, title = {AC Conductance of isolated Aharonov-Bohm rings coupled to an electromagnetic resonator}, author = {Y. Noat, B. Reulet and H. Bouchiat}, booktitle = {Correlated fermions and transport in mesocopic structures}, journal = {ed. T. Martin, G. Montambaux and J. Tran Thanh Van, coll. Frontiers}, pages = {131}} @article{rechange, Year = {1995}, Abstract = {Test de solution de rechange}, author = {Allard, S.}, title = {Solution}, journal = {Nature}, volume = {471}, pages = {87}, month = {March}, local-url = {rechange.pdf}} @article{Reulet1995223, Year = {1995}, Abstract = {}, title = {Susceptibilité magnétique orbitale et conductance AC d’anneaux mésoscopiques isolés}, author = {B. Reulet}, journal = {Annales de Physique }, volume = {20}, pages = {223 }} @article{Reulet1995305, Year = {1995}, Abstract = {}, title = {Magnetoconductance, weak localization and electron-electron interactions in semi-ballistic quantum wires}, author = {B. Reulet, H. Bouchiat and D. Mailly}, journal = {Europhysics Letters}, volume = {31}, pages = {305}} @article{Reulet1995BO, Year = {1995}, Abstract = {}, title = {AC conductance of mesoscopic rings}, author = {B. Reulet, H. Bouchiat and D. Mailly}, booktitle = {Quantum Dynamics of Submicron Structures, ed. H. A. Cerdeira, B. Kramer and G. Schön, NATO ASI Series E}, volume = {vol. 291}, pages = {341}} @article{Coleridge1995, Abstract = {Fractional quantum-Hall-effect features around filling factor ν=1/2 have been analyzed using the composite-fermion approach. Effective masses deduced from the temperature dependence of the Shubnikov-de Haas (SdH) oscillations, in agreement with other measurements, show a divergence as the filling factor approaches ν=1/2 and scale as (density)1/2. The magnetic-field dependence of the amplitude is explained quantitatively in terms of normal impurity scattering and a strong dephasing term associated with density inhomogeneities of order 0.5%. It is pointed out that assumptions made in the derivation of the standard theory used to analyze SdH oscillations are less likely to be satisfied for composite fermions and that some caution should therefore be used in interpreting effective-mass results obtained in this way. {\copyright} 1995 The American Physical Society.}, Author = {Coleridge, P.T. and Wasilewski, Z.W. and Zawadzki, P. and Sachrajda, A.S. and Carmona, H.A.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {16}, Pages = {R11603-R11606}, Source = {Scopus}, Title = {Composite-fermion effective masses}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33751352027&partnerID=40&md5=c4b17b86ea91649317dba34758806cac}, Volume = {52}, Year = {1995}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33751352027&partnerID=40&md5=c4b17b86ea91649317dba34758806cac}} @article{Gould199511213, Abstract = {Magnetoconductance measurements have been made on an interesting versatile system. Six independent gates, on a two-dimensional electron-gas heterostructure, are used to define electrostatically two independently controllable antidots within a quantum wire. Measurements in a magnetic field show trapping of trajectories around either a single or a pair of antidots. Collimation, adiabatic transport, and trapping effects combine to create a rich variety of magnetoconductance features which are modulated by large single-period Aharonov-Bohm oscillations at temperatures below 1 K. Experimental features are compared to results from semiclassical ballistic-trajectory models and the similarities and differences between this system and antidot lattices discussed. {\copyright} 1995 The American Physical Society.}, Author = {Gould, C. and Sachrajda, A.S. and Feng, Y. and Delage, A. and Kelly, P.J. and Leung, K. and Coleridge, P.T.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {16}, Pages = {11213-11216}, Source = {Scopus}, Title = {Phase coherence and trajectory trapping around one or two independently controllable antidots in quantum wires}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001218966&partnerID=40&md5=07400a6119849ad557a3f2fa78bc10ef}, Volume = {51}, Year = {1995}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001218966&partnerID=40&md5=07400a6119849ad557a3f2fa78bc10ef}} @article{Johnson19957650, Abstract = {We have introduced a controllable nanoscale incursion into a potential barrier imposed across a two-dimensional electron gas, and report on the phenomena that we observe as the incursion develops. In the quantum Hall regime, the conductance of this system displays quantized plateaus, broad minima, and oscillations. We explain these features and their evolution with electrostatic potential geometry and magnetic field as a progression of current patterns formed by tunneling between edge and localized states within the barrier. {\copyright} 1995 The American Physical Society.}, Author = {Johnson, B.L. and Sachrajda, A.S. and Kirczenow, G. and Feng, Y. and Taylor, R.P. and Henning, L. and Wang, J. and Zawadzki, P. and Coleridge, P.T.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {12}, Pages = {7650-7654}, Source = {Scopus}, Title = {Quantum Hall effect and inter-edge-state tunneling within a barrier}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0002934591&partnerID=40&md5=c39c5bdf4e464220737d67e82e9d79eb}, Volume = {51}, Year = {1995}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0002934591&partnerID=40&md5=c39c5bdf4e464220737d67e82e9d79eb}} @ARTICLE{Ramin19955582, author = {Ramin, M., Reulet, B., Bouchiat, H.}, title = {Electron-electron interactions in one- and three-dimensional mesoscopic disordered rings: A perturbative approach}, journal = {Physical Review B}, year = {1995}, volume = {51}, number = {8}, pages = {5582-5585}, note = {cited By (since 1996) 25}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0001444639&partnerID = 40&md5 = 2f5f68b32e06f1d77ca932d78dd4e1af}, affiliation = {Laboratoire de Physique des Solides, Bâtiment 510, Université Paris Sud, 91405 Orsay, France}, abstract = {We have computed persistent currents in a disordered mesoscopic ring in the presence of small electron-electron interactions, treated in first-order perturbation theory. We have investigated both a contact (Hubbard) and a nearest-neighbor interaction in one dimension and three dimensions (3D). Our results show that a repulsive Hubbard interaction produces a paramagnetic contribution to the average current (whatever the dimension) and increases the value of the typical current. On the other hand, a nearest-neighbor repulsive interaction results in a diamagnetic contribution in 1D and a paramagnetic one in 3D, and tends to decrease the value of the typical current in any dimension. Our study is based on numerical simulations on the Anderson model where the disorder is treated exactly. The numerical results could be justified analytically in the limit of very weak disorder. We have also investigated the influence of the amount of disorder and of the statistical (canonical or grand canonical) ensemble. 1995 The American Physical Society.}, document_type = {Article}, source = {Scopus}} @ARTICLE{Reulet1995124, author = {Reulet, B., Ramin, M., Bouchiat, H., Mailly, D.}, title = {Dynamic response of isolated Aharonov-Bohm rings coupled to an electromagnetic resonator}, journal = {Physical Review Letters}, year = {1995}, volume = {75}, number = {1}, pages = {124-127}, note = {cited By (since 1996) 81}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-4243218923&partnerID = 40&md5 = f6e1c32a8346c114b18a4fb8b19a1dc4}, affiliation = {Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405, Orsay, France; CNRS Lab. Microstructures M., 196, Avenue Ravera, 92220, Bagneux, France}, abstract = {We have measured the flux dependence of both the real and the imaginary conductance of GaAs/GaAlAs isolated mesoscopic rings at 310 MHz. The rings are coupled to a highly sensitive electromagnetic superconducting microresonator and lead to a perturbation of the resonance frequency and quality factor. This experiment provides a new tool for the investigation of the conductance of mesoscopic systems without the need for invasive probes. The results obtained can be compared with recent theoretical predictions emphasizing the differences between isolated and connected geometries and the relation between ac conductance and persistent currents.}, document_type = {Article}, source = {Scopus}} @article{Sun19956361, Abstract = {We present a theoretical model of split-gate quantum wires that are fabricated from GaAs-AlGaAs heterostructures. The model is built on the physical properties of donors and of semiconductor surfaces, and considerations of equilibrium in such systems. Based on the features of this model, we have studied different ionization regimes of quantum wires, provided a method to evaluate the shallow donor density, and calculated the depletion and pinchoff voltages of quantum wires both before and after illumination. A real split-gate quantum wire has been taken as an example for the calculations, and the results calculated for it agree well with experimental measurements. This paper provides an analytic approach for obtaining much useful information about quantum wires, as well as a general theoretical tool for other gated nanostructure systems. {\copyright} 1995 American Institute of Physics.}, Author = {Sun, Y. and Kirczenow, G. and Sachrajda, A.S. and Feng, Y.}, Document_Type = {Article}, Journal = {Journal of Applied Physics}, Number = {12}, Pages = {6361-6369}, Source = {Scopus}, Title = {An electrostatic model of split-gate quantum wires}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000978607&partnerID=40&md5=2a29ac0475911639748beadf03d2ae9f}, Volume = {77}, Year = {1995}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000978607&partnerID=40&md5=2a29ac0475911639748beadf03d2ae9f}} @article{Taylor19959801, Abstract = {The appeal of the lateral surface gate technique lies in the ability to tune the device through application of variable gate bias. We apply positive bias to a 250-nm-wide continuous gate, or stripe, defined above the two-dimensional electron gas of an AlxGa1-xAs/GaAs heterostructure. Following pulsed light emitting diode illumination, inhomogeneities in the region shielded by the stripe can be annealed by tuning the positive bias. We employ this technique to introduce trajectory scrambling events into a ballistic-electron cavity. Through a systematic study of the low-field magnetoresistance of the cavity as a function of positive stripe bias (tuning the inhomogeneities) and temperature (control of electron phase coherence), we examine the interplay between geometry-induced weak localization and classical transport phenomena. In contrast to other recent observations of weak localization in the ballistic regime, our cavity is relatively large (1.8×30 μm2) and the trajectory loops are defined, not by the confining walls of the cavity, but by the profile of the exit port. {\copyright} 1995 The American Physical Society.}, Author = {Taylor, R.P. and Newbury, R. and Dunford, R.B. and Coleridge, P.T. and Sachrajda, A.S. and Adams, J.A.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {15}, Pages = {9801-9805}, Source = {Scopus}, Title = {Classical and weak localization processes in a tunable ballistic-electron cavity}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0042977894&partnerID=40&md5=7aafde03ce03c04f1b3fbe85a4df6986}, Volume = {51}, Year = {1995}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0042977894&partnerID=40&md5=7aafde03ce03c04f1b3fbe85a4df6986}} @article{Reulet1994391, Year = {1994}, Abstract = {}, title = {Conductance of Aharonov-Bohm rings: from the discrete to the continuous spectrum limit}, author = {A. Kamenev, B. Reulet, H. Bouchiat and Y. Gefen}, journal = {Europhysics Letters}, volume = {28}, pages = {391}} @ARTICLE{Bamas19942042, author = {Bamas, P., Cabanel, R., Dessertenne, B., Bouzehouane, K., Bouchiat, H., Reulet, B., Monod, P.}, title = {Low-field-microwave-absorption of YBa2Cu3O6+x loops closed by intrinsic Josephson junction at low temperature (T<4.2 K)}, journal = {Physica C: Superconductivity and its applications}, year = {1994}, volume = {235-240}, number = {PART 3}, pages = {2042-2043}, note = {cited By (since 1996) 0}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-43949156937&partnerID = 40&md5 = 5c8e3e6937ab729053c4052136f0c164}, affiliation = {L. P. M. C., Ecole Normale Supérieure, 24, Rue Lhomond, 75231 Paris 05, France; Laboratoire Central de Recherches, Thomson C.S.F., 91404 Orsay, France; Laboratoire de Physique des Solides, Université Paris-Sud, 91400 Orsay, France}, abstract = {We report modulated microwave absorption studies of a superconducting square loop closed by a josephson junction. We show that the width of the absorption peak is due to quantum fluctuations at low temperature (<1 K) and to thermal fluctuations at higher temperature. 1994.}, document_type = {Article}, source = {Scopus}} @article{Coleridge1994448, Abstract = {A pair of Quantum Point Contacts separated by a continuous barrier have been fabricated using the surface gate technique. Transport measurements for each component of this system and for various combinations have shown both additive and non-additive behaviour. The results are explained by a combination of reflection by the barrier of electrons collimated by the Quantum Point Contacts and transport by diffusion across the barrier. {\copyright} 1994.}, Author = {Coleridge, P.T. and Taylor, R.P. and Sachrajda, A.S. and Adams, J.A.}, Document_Type = {Article}, Journal = {Surface Science}, Number = {1-3}, Pages = {448-452}, Source = {Scopus}, Title = {Anti-collimation of ballistic electrons by a potential barrier}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028401062&partnerID=40&md5=d3845553763d4017d1f2dde73fa29762}, Volume = {305}, Year = {1994}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028401062&partnerID=40&md5=d3845553763d4017d1f2dde73fa29762}} @article{Coleridge199410798, Abstract = {Shubnikov-de Haas oscillations have been studied, at low temperatures, in a high-mobility quantum-Hall-effect sample. A linear increase with increasing magnetic field of the peak values of resistance is observed and is explained quantitatively by a quantum diffusion model with predominantly small-angle scattering. The results are inconsistent with recent suggestions that the peak values of conductivity, between integer-quantum-Hall-effect plateaus, are e2/2h. {\copyright} 1994 The American Physical Society.}, Author = {Coleridge, P.T. and Zawadzki, P. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {15}, Pages = {10798-10801}, Source = {Scopus}, Title = {Peak values of resistivity in high-mobility quantum-Hall-effect samples}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0040149398&partnerID=40&md5=ed0b55630596a37e79c6858968dc2be5}, Volume = {49}, Year = {1994}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0040149398&partnerID=40&md5=ed0b55630596a37e79c6858968dc2be5}} @article{Feng199485, Abstract = {We describe the fabrication and low temperature characterization of nanostructures defined by submicron-sized gate, interconnect and Ohmic metallizations on the surface of AlGaAs/GaAs heterostructures. A two level metallization architecture is used with Ohmic and gate surface patterns, separated by an inter-layer insulator, linked by patterned interconnects. The procedure, which features a 10nm alignment accuracy, can be used to interconnect metal patterns as small as 100nm. For the Ohmic metallization we discuss the injection properties of the contact as it is reduced to less than 1μm in diameter and present results which indicate the minimum size of Ohmic contacts that can be reliably formed using a Ni-Ge-Au metallization. The approach is illustrated with the fabrication and characterization of submicron-sized Corbino discs. {\copyright} 1994 Academic Press. All rights reserved.}, Author = {Feng, Y. and Taylor, R.P. and Coleridge, P.T. and Sachrajda, A.S. and Davies, M. and Zawadzki, P. and McCaffrey, J.}, Document_Type = {Article}, Journal = {Superlattices and Microstructures}, Number = {2}, Pages = {85}, Source = {Scopus}, Title = {Demonstration of intricate gate, Ohmic and interconnect metallizations for nanostructure construction}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028693864&partnerID=40&md5=473046ad258c3b8df1a22a96a0926c29}, Volume = {15}, Year = {1994}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028693864&partnerID=40&md5=473046ad258c3b8df1a22a96a0926c29}} @article{Kirczenow19942069, Abstract = {We have introduced a controllable artificial impurity or ''antidot'' into a quantum wire and report on the novel phenomena observed as this system evolves from classical behavior at low magnetic fields to the quantum Hall regime. In the transition, conductance resonances due to magnetically bound impurity states are detected. The resonant oscillations exhibit beating and sharp period changes. A theoretical model based on an interedge state coupling mechanism and a new nonlocal effect of edge state formation at local potential energy maxima account for the principal experimental features. {\copyright} 1994 The American Physical Society.}, Author = {Kirczenow, G. and Sachrajda, A.S. and Feng, Y. and Taylor, R.P. and Henning, L. and Wang, J. and Zawadzki, P. and Coleridge, P.T.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {13}, Pages = {2069-2072}, Source = {Scopus}, Title = {Artificial impurities in quantum wires: From classical to quantum behavior}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000844839&partnerID=40&md5=c9b84bd5c05c53b9da8e0e48b541adf7}, Volume = {72}, Year = {1994}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000844839&partnerID=40&md5=c9b84bd5c05c53b9da8e0e48b541adf7}} @ARTICLE{Reulet19942259, author = {Reulet, B., Bouchiat, H.}, title = {AC conductivity of mesoscopic rings: The discrete-spectrum limit}, journal = {Physical Review B}, year = {1994}, volume = {50}, number = {4}, pages = {2259-2272}, note = {cited By (since 1996) 17}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0001764931&partnerID = 40&md5 = e9d07b2202c389ca113b0b1bc554d810}, affiliation = {Laboratoire de Physique des Solides, Batiment 510, Université Paris Sud, 91405 Orsay, France}, abstract = {We present an extensive study of the current response of isolated mesoscopic rings (noninteracting electrons in the diffusive regime) to a small ac flux superimposed on a dc Aharonov-Bohm flux. This response can be very different from the conductance of the same ring connected to a voltage source. We emphasize the importance of the inelastic rate γ compared to the level spacing Δ and the driving frequency ω. We essentially focus on the discrete-spectrum limit γΔ. The conductivity has an imaginary component which, at low frequency, is related to the flux derivative of the persistent current through the ring; as previously shown this quantity presents an ensemble average which is zero in the grand canonical case but which is finite in the canonical statistical ensemble. At frequencies larger than γ we show evidence of an extra contribution to the imaginary conductivity which is finite and temperature independent in the grand canonical ensemble, and increases with temperature in the canonical case. The real part of the average conductivity exhibits Φ0/2-periodic flux oscillations which are also very sensitive to the statistical ensemble: for the canonical ensemble, these oscillations can assume either sign compared to the Altshuler, Aharonov, and Spivak oscillations observed in long cylinders and connected arrays of rings. We indeed identify different contributions giving rise to flux oscillations of opposite sign. An off-diagonal contribution related to interlevel transitions which is connected with the flux dependence of the level statistics and gives rise to a negative low-field magnetoconductance, and a diagonal contribution related to the flux dependence of the occupation of the different levels. This past quantity is proportional to the average square of the single-level persistent current and to the inelastic scattering time, and gives rise to a positive low-field magnetoconductance. It can be much larger than the Drude conductance. Our results rely on numerical simulations; most of them are also justified analytically. The American Physical Society.}, document_type = {Article}, source = {Scopus}} @article{Sachrajda1994527, Abstract = {The magnetoconductance of quantum dots at high magnetic fields has been studied experimentally and theoretically as a function of the quantum dot barrier height. It is found that even when the dot is not Coulomb blockaded, electron-electron interactions are required to explain the magnetoconductance oscillations. {\copyright} 1994.}, Author = {Sachrajda, A. and Taylor, R.P. and Dharma-wardana, C. and Adams, J.A. and Zawadzki, P. and Coleridge, P.T.}, Document_Type = {Article}, Journal = {Surface Science}, Number = {1-3}, Pages = {527-535}, Source = {Scopus}, Title = {Electron-electron interactions and the magnetoconductance of submicron quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028396757&partnerID=40&md5=a76b3e9032b0101ff05a7aa1216cd40d}, Volume = {305}, Year = {1994}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028396757&partnerID=40&md5=a76b3e9032b0101ff05a7aa1216cd40d}} @article{Sachrajda199410856, Abstract = {A 300-nm-diameter gate is used to introduce an antidot or artificial impurity into a quantum wire defined in an AlxGa1-xAs/GaAs two-dimensional electron gas. At low magnetic fields, geometry-induced quantum interference effects are observed, while at higher fields adiabatic edge-state transport is established. In the transitional regime, conductance resonances due to magnetically bound impurity states exhibit distinct characteristics including beating, sharp period changes, and spin splitting. An asymmetry is observed between the resonances observed as a function of magnetic field and gate voltage. The results are explained by a model based on an interedge-state coupling mechanism. {\copyright} 1994 The American Physical Society.}, Author = {Sachrajda, A.S. and Feng, Y. and Taylor, R.P. and Kirczenow, G. and Henning, L. and Wang, J. and Zawadzki, P. and Coleridge, P.T.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {15}, Pages = {10856-10863}, Source = {Scopus}, Title = {Magnetoconductance of a nanoscale antidot}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001230974&partnerID=40&md5=698be5dd7c7bc6ff91109f28ecf16a3f}, Volume = {50}, Year = {1994}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0001230974&partnerID=40&md5=698be5dd7c7bc6ff91109f28ecf16a3f}} @article{Steel1994759, Abstract = {The superfluid properties of thin (100-150 nm) of3He were investigated by measuring the rate at which a beaker of liquid3He emptied itself through the adsorbed film, with the film thickness δ decreasing as the level dropped. A beaker rim with a semicircular cross-section was used to provide a well defined geometry and to avoid the effects of small scratches that may have affected earlier experiments. The film thicknesses were determined by Atkins' oscillaton measurements of4He films on the same surface. The superfluid transition temperature in the film Tc F was suppressed below the bulk value Tc B, and was close to being described by 2δ/ξ(Tc F) = π, as expected for A-phase. The critical current density was more than an order of magnitude smaller than expected for pair-breaking. When a4He monolayer was adsorbed on the substrate, there was no suppresson of Tc F. {\copyright} 1994 Plenum Publishing Corporation.}, Author = {Steel, S.C. and Harrison, J.P. and Zawadzki, P. and Sachrajda, A.}, Document_Type = {Article}, Journal = {Journal of Low Temperature Physics}, Number = {5-6}, Pages = {759-788}, Source = {Scopus}, Title = {3He film flow on a round rim beaker}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000277342&partnerID=40&md5=27ccbf648d00b3869ecc45c2529f21d0}, Volume = {95}, Year = {1994}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000277342&partnerID=40&md5=27ccbf648d00b3869ecc45c2529f21d0}} @article{Taylor1994648, Abstract = {The design of surface gate patterns, used to define nanostructurcs in AlGaAs GaAs heterostructures, is greatly enhanced by the possibility of establishing electrical contact to, and independently biasing, a 100 nm wide isolated gate. We describe the fabrication of a multi-level metallisation architecture which can be used to contact a nanoscale central gate and monitor the transition from a quantum dot to ring geometry. We employ geometry induced quantum interference effects as a novel low temperature characterisation tool and report experiments in which the central electrode acts as an artificial impurity. {\copyright} 1994.}, Author = {Taylor, R.P. and Feng, Y. and Sachrajda, A.S. and Adams, J.A. and Davies, M. and Coleridge, P.T. and Zawadski, P.}, Document_Type = {Article}, Journal = {Surface Science}, Number = {1-3}, Pages = {648-653}, Source = {Scopus}, Title = {Fabrication and characterisation of multi-level lateral nano-devices}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028391829&partnerID=40&md5=8ec968a15c25056920fc2da0186169e0}, Volume = {305}, Year = {1994}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028391829&partnerID=40&md5=8ec968a15c25056920fc2da0186169e0}} @article{Taylor1994317, Abstract = {We report the use of a lateral surface gate stripe bisecting a relatively large, high mobility ballistic electron cavity to examine geometry-induced weak localisation effects. Illumination and positive bias applied to the stripe gate are used to produce a controllable trajectory scrambling region within the cavity.}, Author = {Taylor, R.P. and Newbury, R. and Dunford, R.B. and Coleridge, P.T. and Sachrajda, A.S. and Adams, J.A.}, Document_Type = {Article}, Journal = {Superlattices and Microstructures}, Number = {3}, Pages = {317-320}, Source = {Scopus}, Title = {Tunable ballistic electron cavity exhibiting geometry-induced weak localisation}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028740787&partnerID=40&md5=26ea738d38fd53bde7d9e49dc4465f92}, Volume = {16}, Year = {1994}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028740787&partnerID=40&md5=26ea738d38fd53bde7d9e49dc4465f92}} @article{Taylor1994579, Abstract = {A semi-classical trajectory model is used to calculate the magneto-resistance of submicron-sized dots with entrance and exit quantum point contact leads. A comparison with experimental data allows the determination of the electron density and the mean free path for the confined regions and shows that these parameters can differ from their equivalent "bulk" values. It is found that for realistic geometries the calculated conductance is extremely sensitive to the angular spread of the collimated beam but depends only weakly on the effective width of the quantum point contacts. {\copyright} 1994.}, Author = {Taylor, R.P. and Sachrajda, A.S. and Freedman, D. and Kelly, P.J.}, Document_Type = {Article}, Journal = {Solid State Communications}, Number = {7}, Pages = {579-582}, Source = {Scopus}, Title = {Density of electrons in a lateral quantum dot by semi-classical trajectory analysis}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028381155&partnerID=40&md5=a65d81a0cce7d9e3334d1b2e1b282a26}, Volume = {89}, Year = {1994}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028381155&partnerID=40&md5=a65d81a0cce7d9e3334d1b2e1b282a26}} @article{Feng19931666, Abstract = {We present the first demonstration of a nanostructural device with a central electrode (diameter ≊300 nm) which is contacted independently. This structure is used to create a quantum wire into which an "impurity" of variable size can be introduced. With additional confining gates the structure can also be used to create a quantum dot which can be converted continuously into a quantum ring. Experimental results of magnetoresistance in both low and high magnetic fields are presented which demonstrate the effect of introducing the artificial impurity to a quantum wire.}, Author = {Feng, Y. and Sachrajda, A.S. and Taylor, R.P. and Adams, J.A. and Davies, M. and Zawadzki, P. and Coleridge, P.T. and Landheer, D. and Marshall, P.A. and Barber, R.}, Document_Type = {Article}, Journal = {Applied Physics Letters}, Number = {12}, Pages = {1666-1668}, Source = {Scopus}, Title = {Demonstration of quantum dots and quantum wires with removable impurities}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0003074940&partnerID=40&md5=08c5d0112fd96daaae463a347d04dd62}, Volume = {63}, Year = {1993}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0003074940&partnerID=40&md5=08c5d0112fd96daaae463a347d04dd62}} @article{Sachrajda19936811, Abstract = {We discuss magnetoconductance oscillations arising from transmission and reflection of current via edge states which are confined within lateral quantum dots by entrance and exit port barriers. An interplay of several resonant processes involving spin-resolved edge states determines the evolution of the oscillations as a function of the conductance of the barriers. {\copyright} 1993 The American Physical Society.}, Author = {Sachrajda, A.S. and Taylor, R.P. and Dharma-Wardana, C. and Zawadzki, P. and Adams, J.A. and Coleridge, P.T.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {11}, Pages = {6811-6814}, Source = {Scopus}, Title = {Spin-controlled resonances in the magnetotransport in quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000886217&partnerID=40&md5=d23f4164ba4b64dfea0605c4402ab894}, Volume = {47}, Year = {1993}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0000886217&partnerID=40&md5=d23f4164ba4b64dfea0605c4402ab894}} @article{Taylor19934458, Abstract = {The use of surface gates to define submicrometer-size dots incorporating quantum point contacts (QPC's) is proving profitable in investigating a number of effects including single electron effects and geometry-induced quantum interference. In these studies, characterization of the dots is essential. We report zero- and low-magnetic-field analysis of ballistic transmission through these structures and discuss the trajectories' interaction with the confining potential profiles. We also consider the implications of the component QPC's for reciprocity. {\copyright} 1993 The American Physical Society.}, Author = {Taylor, R.P. and Sachrajda, A.S. and Adams, J.A. and Coleridge, P.T. and Zawadzki, P.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {8}, Pages = {4458-4463}, Source = {Scopus}, Title = {Zero- and low-magnetic-field transport characterization of AlxGa1-xAs/GaAs lateral dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-3643131927&partnerID=40&md5=6a49f5e6e18af1a3f6f22cbf9a60071d}, Volume = {47}, Year = {1993}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-3643131927&partnerID=40&md5=6a49f5e6e18af1a3f6f22cbf9a60071d}} @article{Dharma-wardana1992631, Abstract = {We discuss two recent experiments involving current transmission and reflection via trapped edge states in quantum dots. We show that the observed magnetoconductance oscillations, resulting from tunneling through these trapped states, requires an explanation in terms of an electron interaction screened by fully transmitted edge states. {\copyright} 1992.}, Author = {Dharma-wardana, M.W.C. and Taylor, R.P. and Sachrajda, A.S.}, Document_Type = {Article}, Journal = {Solid State Communications}, Number = {6}, Pages = {631-634}, Source = {Scopus}, Title = {The effect of coulomb interactions on the magnetoconductance oscillations of quantum dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026953146&partnerID=40&md5=2f92d160c4b9313c9cf2af4ba8c45676}, Volume = {84}, Year = {1992}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026953146&partnerID=40&md5=2f92d160c4b9313c9cf2af4ba8c45676}} @ARTICLE{Gefen199215922, author = {Gefen, Y., Reulet, B., Bouchiat, H.}, title = {Energy and current correlations in mesoscopic rings and quantum dots}, journal = {Physical Review B}, year = {1992}, volume = {46}, number = {24}, pages = {15922-15929}, note = {cited By (since 1996) 2}, url = {http://www.scopus.com/inward/record.url?eid = 2-s2.0-0001353441&partnerID = 40&md5 = fb11f88229a54b9007566e8c3d0e28d5}, affiliation = {Department of Physics, Weizmann Institute of Science, Rehovot, 76100, Israel; Laboratoire de Physique des Solides, Bâtiment 510, Université Paris-Sud, 91405 Orsay, France}, abstract = {With a view to some of the late developments in the thermodynamics of mesoscopic systems, we examine the problem of level correlations in moderately disorderd (diffusive) conductors. We briefly review the thermodynamic relations, employed within perturbation theory. We calculate correlation functions among single electron levels, and magnetic-field (magnetic-flux) derivatives thereof. Specifically, we evaluate both single-level current and single-level curvature correlations, and use them to examine the typical current, the paramagnetic susceptibility, and the energy power spectrum of Aharonov-Bohm geometries, derived previously. We stress the role of spectral rigidity, and present comparison with simply connected systems subject to a magnetic field. 1992 The American Physical Society.}, document_type = {Article}, source = {Scopus}} @article{Reulet1992-22, Year = {1992}, Abstract = {}, title = {Courants permanents dans les anneaux mésoscopiques}, author = {H. Bouchiat, G. Montambaux, L.P. Lévy and B. Reulet}, journal = {Pour la Science }} @article{Taylor19929149, Abstract = {Electrical-transport measurements were performed on a system consisting of two quantum point contacts (QPCs) in series, where one of the point contacts exhibited low-frequency telegraph noise due to single-impurity effects. We show this system to be ideal for the study of equilibration between the edge states that form at high magnetic fields. We investigate both the adiabatic and nonadiabatic regimes and show that in the transitional magnetic-field range the conductance is compatible with a complete equilibration but between a limited number of edge states only. We also discuss the equivalent experiment at zero field, where one can study the effect of the potential fluctuations on the collimation of the ballistic electrons. In addition, we confirm the observation of 4e2/h quantization in the conductance of a wide QPC. {\copyright} 1992 The American Physical Society.}, Author = {Taylor, R.P. and Fortin, S. and Sachrajda, A.S. and Adams, J.A. and Fallahi, M. and Davies, M. and Coleridge, P.T. and Zawadzki, P.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {16}, Pages = {9149-9152}, Source = {Scopus}, Title = {Low-frequency noise in multiple-quantum-point-contact systems}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-22244436530&partnerID=40&md5=c5885e6ed93cfc552b81d66cf742ebe6}, Volume = {45}, Year = {1992}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-22244436530&partnerID=40&md5=c5885e6ed93cfc552b81d66cf742ebe6}} @article{Taylor1992219, Abstract = {We report low field magnetoresistance measurements of two QPC systems. For a staggered pair of QPCs were separate the ballistic and non-ballistic contributions to the magneto-resistance and report new trends. For a quantum dot we investigate magnetic focusing and demonstrate its use as a probe of the carrier density within the dot. {\copyright} 1992.}, Author = {Taylor, R.P. and Sachrajda, A.S. and Adams, J.A. and Leavens, C.R. and Zawadzki, P. and Coleridge, P.T.}, Document_Type = {Article}, Journal = {Superlattices and Microstructures}, Number = {2}, Pages = {219-222}, Source = {Scopus}, Title = {Experimental investigation of quantum point contacts separated by open and enclosed regions}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026765902&partnerID=40&md5=0c7619cc82abc761cbd2180fc7c43e34}, Volume = {11}, Year = {1992}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026765902&partnerID=40&md5=0c7619cc82abc761cbd2180fc7c43e34}} @article{Taylor1992247, Abstract = {We investigate both low and high field magnetotransport through submicron quantum dots using a six-gate coupled dot structure. At low fields we have studied classical magnetic focusing and coherent effects in this confined geometry. At higher fields we have observed a new phenomenon, the resonant backscattering of an edge state modulated by zero-dimensional states. At the highest fields we do not observe oscillations associated with the zero-dimensional states. {\copyright} 1992.}, Author = {Taylor, R.P. and Sachrajda, A.S. and Adams, J.A. and Zawadzki, P. and Coleridge, P.T. and Davies, M.}, Document_Type = {Article}, Journal = {Surface Science}, Number = {1-3}, Pages = {247-252}, Source = {Scopus}, Title = {Classical and quantum transmission effects in submicron-size dots}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026820320&partnerID=40&md5=e0601ea73c4574573acbf09b4350ea39}, Volume = {263}, Year = {1992}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026820320&partnerID=40&md5=e0601ea73c4574573acbf09b4350ea39}} @article{Taylor1992334, Author = {Taylor, R.P. and Sachrajda, A.S. and Adams, J.A. and Zawadzki, P. and Coleridge, P.T. and Marshall, P.}, Document_Type = {Erratum}, Journal = {Physica B: Physics of Condensed Matter}, Number = {4}, Pages = {334}, Source = {Scopus}, Title = {Collimation effects in quantum point contacts}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-44049122283&partnerID=40&md5=f2ca4a904715885904a734b8707dd803}, Volume = {176}, Year = {1992}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-44049122283&partnerID=40&md5=f2ca4a904715885904a734b8707dd803}} @article{Taylor19921989, Abstract = {We discuss the electronic transmission through lateral dots, featuring both the Aharonov-Bohm-type oscillations observed in high magnetic field sweeps and Coulomb blockade oscillations detected as a function of electron density. We focus on the interplay of these two effects and demonstrate two intrinsic features of submicron dot behavior the manifestation of the Aharonov-Bohn oscillations in a resonant reflection mode and a novel regime characterized by the simultaneous observation and a commensurate relationship of the two effects. {\copyright} 1992 The American Physical Society.}, Author = {Taylor, R.P. and Sachrajda, A.S. and Zawadzki, P. and Coleridge, P.T. and Adams, J.A.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {13}, Pages = {1989-1992}, Source = {Scopus}, Title = {Aharonov-Bohm oscillations in the Coulomb blockade regime}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-4244023811&partnerID=40&md5=f82e6411194f61a07046d7eada1b995c}, Volume = {69}, Year = {1992}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-4244023811&partnerID=40&md5=f82e6411194f61a07046d7eada1b995c}} @article{Buckthought1991191, Abstract = {Tilted magnetic field activation measurements have been made at the 5 3, 4 3 and 7 5 filling factors. Measurements are presented as a function of carrier density. At these filling factors the magnetic field dependence of the gap is obtained. At both 4 3 and 7 5 filling factors a strong density dependence to the behaviour is observed. {\copyright} 1991.}, Author = {Buckthought, A. and Boulet, R. and Sachrajda, A. and Wasilewski, Z. and Zawadzki, P. and Guillon, F.}, Document_Type = {Article}, Journal = {Solid State Communications}, Number = {3}, Pages = {191-194}, Source = {Scopus}, Title = {Activation measurements of the fractional quantum hall effect in a tilted magnetic field as a function of electron density}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026140543&partnerID=40&md5=f53d93bee3bbb66e32bb843ab8629c6e}, Volume = {78}, Year = {1991}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026140543&partnerID=40&md5=f53d93bee3bbb66e32bb843ab8629c6e}} @article{Taylor1991243, Abstract = {We report magnetoresistance measurements on staggered quantum contacts in series. The enhanced conductance reveals interesting effects associated with the geometry of the structure and its collimation of the ballistic electrons. We are able to isolate the contributions of ballistic and non-ballistic trajectories to the conductance. We also show the system to be an interesting demonstration of the reciprocity theorem. {\copyright} 1991.}, Author = {Taylor, R.P. and Sachrajda, A.S. and Adams, J.A. and Zawadzki, P. and Coleridge, P.T. and Marshall, P.}, Document_Type = {Article}, Journal = {Physica B: Physics of Condensed Matter}, Number = {1-3}, Pages = {243-246}, Source = {Scopus}, Title = {Collimation effects in quantum point contacts}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026371546&partnerID=40&md5=1d7dfa6d59d721f026a1e7a28377a9e3}, Volume = {175}, Year = {1991}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026371546&partnerID=40&md5=1d7dfa6d59d721f026a1e7a28377a9e3}} @article{Williams1991493, Abstract = {We examine the electronic transport properties of a sheet of silicon donors introduced during the molecular beam epitaxial growth of InAs/GaAs, using the suspended growth doping technique. Layers are characterised by magnetotransport measurements in magnetic fields applied parallel and perpendicular to the sample surface. {\copyright} 1991.}, Author = {Williams, R.L. and Coleridge, P. and Wasilewski, Z.R. and Dion, M. and Sachrajda, A. and Rolfe, S.}, Document_Type = {Article}, Journal = {Solid State Communications}, Number = {6}, Pages = {493-497}, Source = {Scopus}, Title = {Silicon atomic plane doping in MBE grown InAs/GaAs}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026157061&partnerID=40&md5=830d3cd446bfa9a7bca510db575a620c}, Volume = {78}, Year = {1991}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026157061&partnerID=40&md5=830d3cd446bfa9a7bca510db575a620c}} @article{Sachrajda19901021, Abstract = {Activation measurements were made on the 2 3, 4 3 5 3 and 7 5 fractions on two samples as a function of carrier density. The carrier density was varied by the use of the persistent photoconductivity effect. The results confirm the importance of spin in the Fractional Quantum Hall Effect. The results are consistent with recent ground state polarity assignments. The data is also analyzed in terms of a phenomenological technique to extract the quasiparticle charge. {\copyright} 1990.}, Author = {Sachrajda, A. and Boulet, R. and Wasilewski, Z. and Coleridge, P. and Guillon, F.}, Document_Type = {Article}, Journal = {Solid State Communications}, Number = {9}, Pages = {1021-1025}, Source = {Scopus}, Title = {Activation measurements of the fractional quantum hall effect as a function of magnetic field}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0025442168&partnerID=40&md5=463fc6d22fd82a3797dd306974822605}, Volume = {74}, Year = {1990}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0025442168&partnerID=40&md5=463fc6d22fd82a3797dd306974822605}} @article{Steel1990599, Abstract = {Superfluid 3He film flow out of a copper beaker was measured without and then with a 4He coating on the copper surface. The effect of the 4 He was to convert the substrate from a purely diffuse to a purely specular surface for the 3He quasiparticles. {\copyright} 1990.}, Author = {Steel, S.C. and Zawadzki, P. and Harrison, J.P. and Sachrajda, A.}, Document_Type = {Article}, Journal = {Physica B: Physics of Condensed Matter}, Number = {PART 1}, Pages = {599-600}, Source = {Scopus}, Title = {3He Film flow: 4He substrate coating effect}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0025466388&partnerID=40&md5=6678ba8255581f164d5ba5195444ba3f}, Volume = {165-166}, Year = {1990}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0025466388&partnerID=40&md5=6678ba8255581f164d5ba5195444ba3f}} @article{Sachrajda198910460, Abstract = {Measurements were made of the breakdown of the quantum Hall effect in GaAs/AlxGa1-xAs heterostructures with narrow constrictions (1 m). Structures were observed in both field sweeps and current sweeps. A simple model provides evidence that the origin of these structures is an inhomogeneity size effect which occurs when the length scale of the inhomogeneity becomes comparable with the sample width. The consequences of these inhomogeneities for critical current measurements are discussed. {\copyright} 1989 The American Physical Society.}, Author = {Sachrajda, A.S. and Landheer, D. and Boulet, R. and Moore, T.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {14}, Pages = {10460-10463}, Source = {Scopus}, Title = {Evidence for an inhomogeneity size effect in narrow GaAs/AlxGa1-xAs constrictions}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0345143790&partnerID=40&md5=a767041d3365b611ed8adda1b5fffc5f}, Volume = {39}, Year = {1989}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0345143790&partnerID=40&md5=a767041d3365b611ed8adda1b5fffc5f}} @article{Daunt1988547, Abstract = {Superfluid3He film flow over the rim of a copper beaker has been measured. The flow rate was measured as a function of temperature and as a function of depth of3He below the rim or film thickness at the rim. The critical current, calculated from the flow rate, varied as (1 -T/Tc p)3/2 as expected for pair-breaking;Tc p is a film-thickness-dependent critical temperature. However, the magnitude of the current was an order of magnitude smaller than expected for pair-breaking, in agreement with other experiments that have demonstrated a lower dissipation mechanism in superfluid3He. The suppression of the critical temperature Tc p/Tc b, where Tc b=0.93 mK is the bulk3He transition temperature, varied from 0.93 to 0.7 as the film thickness at the rim varied from 120 to 90 nm. These ratios are larger than expected from Ginzburg-Landau or microscopic theory of superfluid3He-B. {\copyright} 1988 Plenum Publishing Corporation.}, Author = {Daunt, J.G. and Harris-Lowe, R.F. and Harrison, J.P. and Sachrajda, A. and Steel, S. and Turkington, R.R. and Zawadski, P.}, Document_Type = {Article}, Journal = {Journal of Low Temperature Physics}, Number = {5-6}, Pages = {547-568}, Source = {Scopus}, Title = {Critical temperature and critical current of thin-film superfluid3He}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0005243394&partnerID=40&md5=bf396a98e09266c57485adec696bb86a}, Volume = {70}, Year = {1988}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0005243394&partnerID=40&md5=bf396a98e09266c57485adec696bb86a}} @article{DIorio1988165, Abstract = {We have studied the breakdown characteristics of a narrow two-dimensional electron gas channel in GaAs/AlGaAs heterostructures over a wide temperature range before and after illumination. We report on the behaviour of the breakdown current, the asymmetry of the Shubnikov-de Haas oscilations and the appearance of step-like structures in the diagonal resistivity π vv. The step-like features are not consistent with a quasi-elastic inter Landau level scattering mechanism. {\copyright} 1987.}, Author = {D'Iorio, M. and Sachrajda, A.S. and Landheer, D. and Buchanan, M. and Moore, T. and Miner, C.J. and Springthorpe, A.J.}, Document_Type = {Article}, Journal = {Surface Science}, Number = {1-3}, Pages = {165-170}, Source = {Scopus}, Title = {Narrow channel breakdown in GaAs/AlGaAs Heterostructures}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0040816418&partnerID=40&md5=dd7faab308a4920d1d3b91ceac13377e}, Volume = {196}, Year = {1988}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0040816418&partnerID=40&md5=dd7faab308a4920d1d3b91ceac13377e}} @article{Fletcher19883137, Abstract = {We report the first experimental demonstration that phonon drag is present in the thermopower of a two-dimensional electron gas at a GaAs-Ga0.68Al0.32As heterojunction in both zero and high magnetic fields. The experiment involves polishing the rear surface of the GaAs plate on which the junction is grown in order to increase the phonon mean free path. This results in an increase of the thermopower by about a factor of 2 even though the electrical resistivities are unaffected. {\copyright} 1988 The American Physical Society.}, Author = {Fletcher, R. and DIorio, M. and Sachrajda, A.S. and Stoner, R. and Foxon, C.T. and Harris, J.J.}, Document_Type = {Article}, Journal = {Physical Review B}, Number = {6}, Pages = {3137-3140}, Source = {Scopus}, Title = {Evidence of phonon drag in the thermopower of a GaAs-Ga0.68Al0.32As heterojunction}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0642280496&partnerID=40&md5=22a2cc1c28b8e000ea1ad09d81b1c1ca}, Volume = {37}, Year = {1988}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0642280496&partnerID=40&md5=22a2cc1c28b8e000ea1ad09d81b1c1ca}} @article{Ruesink1988393, Abstract = {An analysis of the semicircular loop, vibrating-wire3He viscometer has been made. Emphasis was placed upon the magnetic field dependence of the resonance frequency and frequency width (damping) in order to study the suitability of the device for a field-independent thermometer. The analysis was complemented by experiments with Ta, Nb-Ti, Cu, Ag, Au, and Cu-Ni wires. It was found that the various wires, whether superconducting or pure or impure normal metals, have advantages and disadvantages. The superconducting wires show a large field-dependent frequency shift due to induced magnetization and a field-dependent damping due to flux motion. Pure normal metals also show induced magnetization (eddy-current) frequency shift and damping, and impure metals and alloys give Joule heating. Nevertheless, it is shown that the device can be used in the range 1-10 mK and for fields from 20 mT to 1 T. {\copyright} 1988 Plenum Publishing Corporation.}, Author = {Ruesink, W. and Harrison, J.P. and Sachrajda, A.}, Document_Type = {Article}, Journal = {Journal of Low Temperature Physics}, Number = {3-4}, Pages = {393-411}, Source = {Scopus}, Title = {The vibrating wire viscometer as a magnetic field-independent3He thermometer}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0023962490&partnerID=40&md5=9052769941e93a9fcba25f266409b6f7}, Volume = {70}, Year = {1988}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0023962490&partnerID=40&md5=9052769941e93a9fcba25f266409b6f7}} @article{Moshchalkov1986893, Abstract = {We have measured the magnetoresistance ρ(H,T0) of the magnetic Kondo lattice CeAl2 at temperatures T0 in the range 0.035 - 1.3 K, well below the N{\'e}el temperature TN=3.8 K, in magnetic fields H up to 145 k0e. The ρ vs H curve exhibits a rapid decrease between H=45-65 kOe corresponding to the metamagnetic transition at H=HM. The resistivity then levels out to a value which depends only weakly on field and temperature. For H<HM a small positive magnetoresistance was observed with the derivative dρ/dH increasing as the temperature is lowered. The present results are compared with the ρ(H,T0) data obtained for the CePb3 magnetic Kondo lattice, where the decrease in the resistivity at H∼HM was considered earlier to be evidence of field induced superconductivity. {\copyright} 1986.}, Author = {Moshchalkov, V.V. and Coleridge, P. and Fawcett, E. and Sachrajda, A.}, Document_Type = {Article}, Journal = {Solid State Communications}, Number = {12}, Pages = {893-895}, Source = {Scopus}, Title = {High field magnetoresistance of CeAl2 at low temperatures}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0022952188&partnerID=40&md5=30877c0c4de683cf4f49572a7428941a}, Volume = {60}, Year = {1986}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0022952188&partnerID=40&md5=30877c0c4de683cf4f49572a7428941a}} @conference{Shu19861263, Abstract = {The design and construction of a noise thermometer built around two commercially available SQUID systems is presented. The thermometer is based upon the direct-coupled system of Webb, Gifford and Wheatley but uses a novel digital squarer/integrator to analyse the noise voltage. Preliminary results demonstrate the performance of the thermometer.}, Author = {Shu, Q.S. and Harrison, J.P. and Idziak, S. and Sachrajda, A. and Seeto, T.}, Document_Type = {Conference Paper}, Journal = {Advances in Cryogenic Engineering}, Pages = {1263-1268}, Source = {Scopus}, Title = {NOISE THERMOMETRY WITH COMMERCIAL SQUIDS.}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0023016941&partnerID=40&md5=651ecbeaa1e2e7c62049bc24003e30f1}, Volume = {31}, Year = {1986}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0023016941&partnerID=40&md5=651ecbeaa1e2e7c62049bc24003e30f1}} @article{Sachrajda19851602, Abstract = {He3 film flow has been observed. The maximum flow rate, at 0.7 mK, over a rim 0.9 mm above the He3 level, was 1.2 mm3/h corresponding to an approximate flow velocity of 0.2 mm/sec. A flow rate of 0.2 mm3/h 0.1 mm/sec) was measured with the rim 14 mm above the level. The transition to superflow occurred at 3.5 0.5 mK for the 0.9-mm film and 2.0 0.5 mK for the 14-mm film. This flow is in a regime where the film thickness is less than or comparable to the bulk superfluid He3 coherence length 1000 at 0.8 mK) and the temperature is higher than the bulk He3 superfluid transition temperature (1.08 mK) and corresponds, we believe, to a two-dimensional superfluid phase of He3. {\copyright} 1985 The American Physical Society.}, Author = {Sachrajda, A. and Harris-Lowe, R.F. and Harrison, J.P. and Turkington, R.R. and Daunt, J.G.}, Document_Type = {Article}, Journal = {Physical Review Letters}, Number = {15}, Pages = {1602-1605}, Source = {Scopus}, Title = {He3 film flow: Two-dimensional superfluidity}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-3743071397&partnerID=40&md5=f18cd3da7aefe4ee7962c9f4caa3b201}, Volume = {55}, Year = {1985}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-3743071397&partnerID=40&md5=f18cd3da7aefe4ee7962c9f4caa3b201}} @conference{Guillon19841243, Abstract = {In very dilute **3He-**4He mixtures experimentally determined phonon-**3He quasiparticle coupling is larger than that expected from the measured quasiparticle-quasiparticle coupling and the Baym-Ebner theory that relates the two.}, Author = {Guillon, F. and Harrison, J.P. and Sachrajda, A.}, Document_Type = {Conference Paper}, Number = {pt 2}, Pages = {1243-1244}, Source = {Scopus}, Title = {PHONON-QUASIPARTICLE INTERACTION IN VERY DILUTE **3He-**4He MIXTURES.}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0021661015&partnerID=40&md5=bed4ed93f94633a2534914adb407562a}, Year = {1984}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0021661015&partnerID=40&md5=bed4ed93f94633a2534914adb407562a}} @article{Guillon198495, Abstract = {As part of a Kapitza resistance study, the thermal resistance between the phonon and3He quasiparticle excitations in three dilute3He-4He mixtures (0.03%, 0.1%, and 0.3%3He) has been measured over the temperature range 20-50 mK. The results are compared with a theory based upon the Baym-Ebner interaction between the excitations. The temperature dependences agree, but the measured resistance is smaller than the theoretical resistance by a factor of ∼2 that varies inversely with concentration. This concentration-dependent phonon-quasiparticle coupling discrepancy is consistent with the results of recent heat pulse absorption experiments by Husson et al. An indirect measurement was made of the same thermal resistance in3He-4He mixtures confined within the pores of a submicrometer sintered copper powder, with the results confirming a size-effect model for the resistance. {\copyright} 1984 Plenum Publishing Corporation.}, Author = {Guillon, F. and Harrison, J.P. and Sachrajda, A. and Atkins, D.}, Document_Type = {Article}, Journal = {Journal of Low Temperature Physics}, Number = {1-2}, Pages = {95-121}, Source = {Scopus}, Title = {Thermal resistance between phonon and quasiparticle excitations in dilute mixtures of3He in4He}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0021510921&partnerID=40&md5=6a3bbfc09d7ea915011024570800e5b2}, Volume = {57}, Year = {1984}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0021510921&partnerID=40&md5=6a3bbfc09d7ea915011024570800e5b2}} @article{Sachrajda1984617, Abstract = {In this paper we present reliable measurements of the pressure variation of the spin diffusion coefficient of normal liquid3He in the limiting low-temperature Fermi fluid regime. Deviations from the bulk liquid behavior are observed for a sample confined to a 5-μm glass capillary array in which the mean free path of the3He quasiparticles is of the order of the capillary diameter. These deviations are believed to indicate that the spin momentum specular reflection coefficient is less than unity but greater than zero in this system. {\copyright} 1984 Plenum Publishing Corporation.}, Author = {Sachrajda, A.S. and Brewer, D.F. and Truscott, W.S.}, Document_Type = {Article}, Journal = {Journal of Low Temperature Physics}, Number = {5-6}, Pages = {617-631}, Source = {Scopus}, Title = {Measurements of the spin diffusion coefficient of normal3He in bulk liquid and a restricted geometry}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0021486357&partnerID=40&md5=e958569c28aeb266818f347ab3b4dd70}, Volume = {56}, Year = {1984}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0021486357&partnerID=40&md5=e958569c28aeb266818f347ab3b4dd70}} @conference{Guillon1983193, Author = {Guillon, Francis and Harrison, J.P. and Sachrajda, A.}, Document_Type = {Conference Paper}, Journal = {AIP Conference Proceedings}, Number = {103}, Pages = {193}, Source = {Scopus}, Title = {HEAT TRANSFER IN DILUTE **3He-**4He MIXTURES.}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0020953195&partnerID=40&md5=a8ac2209a232eab37e324149bc4a6ced}, Year = {1983}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0020953195&partnerID=40&md5=a8ac2209a232eab37e324149bc4a6ced}} @article{Brewer19811059, Abstract = {We report measurements of the spin diffusion coefficients of normal liquid 3He in bulk, and in 5μm diameter glass capillary tubes, as a function of pressure (0-30 bar) and temperature (3mK-15mK). The bulk experiments are well into the limiting low temperature Fermi fluid regime, and provide the first reliable measurements of the pressure variation of A = DT2. In the 5μm capillaries, deviations from this relation are found as the quasiparticle mean free path become comparable with the diameter. The results indicate that the spin momentum accommodation coefficient at this surface is less than unity. {\copyright} 1981.}, Author = {Brewer, D.F. and Betts, D.S. and Sachrajda, A. and Truscott, W.S.}, Document_Type = {Article}, Journal = {Physica B+C}, Number = {1-3}, Pages = {1059-1060}, Source = {Scopus}, Title = {Spin diffusion coefficient of normal liquid 3He in infinite and bounded geometries under pressure}, Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0019602463&partnerID=40&md5=937666f2ae83441c48b2bddf0333ce5a}, Volume = {108}, Year = {1981}, Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0019602463&partnerID=40&md5=937666f2ae83441c48b2bddf0333ce5a}}