Entanglement-Assisted Classical Capacity of Noisy Quantum Channels

Phys. Rev. Lett. 83, 3081 – Published 11 October 1999
Charles H. Bennett, Peter W. Shor, John A. Smolin, and Ashish V. Thapliyal


Prior entanglement between sender and receiver, which exactly doubles the classical capacity of a noiseless quantum channel, can increase the classical capacity of some noisy quantum channels by an arbitrarily large constant factor depending on the channel, relative to the best known classical capacity achievable without entanglement. The enhancement factor is greatest for very noisy channels, with positive classical capacity but zero quantum capacity. We obtain exact expressions for the entanglement-assisted capacity of depolarizing and erasure channels in d dimensions.

DOI: http://dx.doi.org/10.1103/PhysRevLett.83.3081

  • Received 19 May 1999
  • Published in the issue dated 11 October 1999

© 1999 The American Physical Society

Authors & Affiliations

Charles H. Bennett1,*, Peter W. Shor2,†, John A. Smolin1,‡, and Ashish V. Thapliyal3,§

  • 1IBM Research Division, Yorktown Heights, New York 10598
  • 2AT&T Research, Florham Park, New Jersey 07932
  • 3Physics Department, University of California, Santa Barbara, California 93106

  • *Email address: bennetc@watson.ibm.com
  • Email address: shor@research.att.com
  • Email address: smolin@watson.ibm.com
  • §Email address: ash@physics.ucsb.edu

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