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Problems of Information Transmission

, Volume 40, Issue 4, pp 318–336 | Cite as

Quantum privacy and quantum wiretap channels

  • N. Cai
  • A. Winter
  • R. W. Yeung
Information Theory

Abstract

Following Schumacher and Westmoreland, we address the problem of the capacity of a quantum wiretap channel. We first argue that, in the definition of the so-called “quantum privacy,” Holevo quantities should be used instead of classical mutual informations. The argument actually shows that the security condition in the definition of a code should limit the wiretapper’s Holevo quantity. Then we show that this modified quantum privacy is the optimum achievable rate of secure transmission.

Keywords

System Theory Mutual Information Achievable Rate Security Condition Secure Transmission 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK “Nauka/Interperiodica” 2004

Authors and Affiliations

  • N. Cai
    • 1
  • A. Winter
    • 2
  • R. W. Yeung
    • 3
  1. 1.Fakultät für MathematikUniversität BielefeldGermany
  2. 2.Department of Computer ScienceUniversity of BristolUnited Kingdom
  3. 3.Department of Information EngineeringThe Chinese University of Hong KongHong Kong

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