Équipe de Recherche en Physique de l'Information Quantique


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}}