Information transmission via entangled quantum states in Gaussian channels with memory

Nicolas J. Cerf, Julien Clavareau, Jérémie Roland, Chiara Macchiavello

Published 2005-08-26Version 1

Gaussian quantum channels have recently attracted a growing interest, since they may lead to a tractable approach to the generally hard problem of evaluating quantum channel capacities. However, the analysis performed so far has always been restricted to memoryless channels. Here, we consider the case of a bosonic Gaussian channel with memory, and show that the classical capacity can be significantly enhanced by employing entangled input symbols instead of product symbols.