Équipe de Recherche en Physique de l'Information Quantique


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}}