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Finite-key analysis for measurement-device-independent quantum key distribution.

  • Curty M EI Telecomunicación, Department of Signal Theory and Communications, University of Vigo, Vigo E-36310, Spain.
  • Xu F Center for Quantum Information and Quantum Control, Department of Physics and Department of Electrical & Computer Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G4.
  • Cui W Center for Quantum Information and Quantum Control, Department of Physics and Department of Electrical & Computer Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G4.
  • Lim CC Group of Applied Physics, University of Geneva, Geneva CH-1211, Switzerland.
  • Tamaki K NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato Wakamiya Atsugi-Shi, Kanagawa 243-0198, Japan.
  • Lo HK Center for Quantum Information and Quantum Control, Department of Physics and Department of Electrical & Computer Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G4.
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  • 2014-04-30
Published in:
  • Nature communications. - 2014
Computer Security
Models, Theoretical
Quantum Theory
Telecommunications
English Quantum key distribution promises unconditionally secure communications. However, as practical devices tend to deviate from their specifications, the security of some practical systems is no longer valid. In particular, an adversary can exploit imperfect detectors to learn a large part of the secret key, even though the security proof claims otherwise. Recently, a practical approach--measurement-device-independent quantum key distribution--has been proposed to solve this problem. However, so far its security has only been fully proven under the assumption that the legitimate users of the system have unlimited resources. Here we fill this gap and provide a rigorous security proof against general attacks in the finite-key regime. This is obtained by applying large deviation theory, specifically the Chernoff bound, to perform parameter estimation. For the first time we demonstrate the feasibility of long-distance implementations of measurement-device-independent quantum key distribution within a reasonable time frame of signal transmission.
Language
  • English
Open access status
bronze
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Persistent URL
https://folia.unifr.ch/global/documents/214583
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