Capacities of lossy bosonic memory channels
Quantum Physics
2010-01-20 v1
Abstract
We introduce a general model for a lossy bosonic memory channel and calculate the classical and the quantum capacity, proving that coherent state encoding is optimal. The use of a proper set of collective field variables allows to unravel the memory, showing that the n-fold concatenation of the memory channel is unitarily equivalent to the direct product of n single-mode lossy bosonic channels.
Cite
@article{arxiv.0903.2764,
title = {Capacities of lossy bosonic memory channels},
author = {Cosmo Lupo and Vittorio Giovannetti and Stefano Mancini},
journal= {arXiv preprint arXiv:0903.2764},
year = {2010}
}
Comments
4 pages, 2 fugures. Comments are welcome