Quantum privacy and quantum wiretap channels

  • Authors:
  • N. Cai;A. Winter;R. W. Yeung

  • Affiliations:
  • Fakultät für Mathematik, Universität Bielefeld, Germany;Department of Computer Science, University of Bristol, United Kingdom;Department of Information Engineering, The Chinese University of Hong Kong, Hong Kong

  • Venue:
  • Problems of Information Transmission
  • Year:
  • 2004

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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.