On Feedback and the Classical Capacity of a Noisy Quantum Channel

Details On Feedback and the Classical Capacity of a Noisy Quantum Channel On Feedback and the Classical Capacity of a Noisy Quantum Channel

2003-05-29

arxiv.org/abs/quant-ph/0305176v1

IEEE Trans. Inform. Theory 51, 320 (2005)

Physics

Quantum Physics

4 Pages, requires IEEEtran.cls

Scientific paper

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.

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