Bidirectional coherent classical communication

Details Bidirectional coherent classical communication Bidirectional coherent classical communication

2004-12-16

arxiv.org/abs/quant-ph/0412126v3

Quantum Information and Computation, vol. 5, no. 4-5, pp. 380-395 (2005)

Physics

Quantum Physics

11 pages, v2 extensive modification and rewriting of the main proof, v3 published version with only a few more changes

Scientific paper

A unitary interaction coupling two parties enables quantum communication in both the forward and backward directions. Each communication capacity can be thought of as a tradeoff between the achievable rates of specific types of forward and backward communication. Our first result shows that for any bipartite unitary gate, coherent classical communication is no more difficult than classical communication -- they have the same achievable rate regions. Previously this result was known only for the unidirectional capacities (i.e., the boundaries of the tradeoff). We then relate the tradeoff curve for two-way coherent communication to the tradeoff for two-way quantum communication and the tradeoff for coherent communiation in one direction and quantum communication in the other.

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