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Fortschritte der Physik

Classical information transfer over noisy quantum channels

Chiara Macchiavello, G. Massimo Palma

Published Apr 24, 2003• 0 citations
Publisher

Abstract

Abstract We study the role of entanglement in the transmission of classical information over noisy quantum channels. We show that entanglement leads to an enhancement of the mutual information when the transmission channel is not memoryless.
DOI
10.1002/prop.200310056

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In Shannon information theory the capacity of a memoryless communication channel cannot be increased by the use of feedback from receiver to sender. In this paper the use of classical feedback is shown to provide no increase in the unassisted classical capacity of a memoryless quantum channel when feedback is used across non-entangled input states, or when the channel is an entanglement--breaking channel. This gives a generalization of the Shannon theory for certain classes of feedback protocols when transmitting through noisy quantum communication channels.