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Phys. Rev. A 67, 040302(R) (2003) [4 pages]

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

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Dominic W. Berry and Barry C. Sanders
Department of Physics and Centre for Advanced Computing—Algorithms and Cryptography, Macquarie University, Sydney, New South Wales 2109, Australia

Received 11 June 2002; revised 1 October 2002; published 4 April 2003

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 cannot 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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.67.040302
DOI:
10.1103/PhysRevA.67.040302
PACS:
03.67.Hk, 03.65.Ud, 03.67.Mn
 
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