Relations for classical communication capacity and entanglement capability of two-qubit operations

2002/05/31 by Dominic W. Berry, Barry C. Sanders
Physics and Astronomy · #quant-ph

paper · pdf · doi:10.1103/physreva.67.040302

published as Phys. Rev. A. 67, 040302(R) (2003) · 4 pages

arxiv created 2002/11/29 · arxiv updated 2009/12/01

Abstract

Bipartite operations underpin both classical communication and entanglement generation. Using a superposition of classical messages, we show that the capacity of a two-qubit operation for error-free entanglement-assisted bidirectional classical communication can not exceed twice the entanglement capability. In addition we show that any bipartite two-qubit operation can increase the communication that may be performed using an ensemble by twice the entanglement capability.

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