Security of Distributed-Phase-Reference Quantum Key Distribution

Tobias Moroder, Marcos Curty, Charles Ci Wen Lim, Le Phuc Thinh, Hugo Zbinden, and Nicolas Gisin
Phys. Rev. Lett. 109, 260501 – Published 26 December 2012
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Abstract

Distributed-phase-reference quantum key distribution stands out for its easy implementation with present day technology. For many years, a full security proof of these schemes in a realistic setting has been elusive. We solve this long-standing problem and present a generic method to prove the security of such protocols against general attacks. To illustrate our result, we provide lower bounds on the key generation rate of a variant of the coherent-one-way quantum key distribution protocol. In contrast to standard predictions, it appears to scale quadratically with the system transmittance.

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  • Received 31 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.260501

© 2012 American Physical Society

Authors & Affiliations

Tobias Moroder1, Marcos Curty2, Charles Ci Wen Lim3, Le Phuc Thinh4, Hugo Zbinden3, and Nicolas Gisin3

  • 1Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Walter-Flex-Straße 3, D-57068 Siegen, Germany
  • 2EI Telecomunicación, Department of Signal Theory and Communications, University of Vigo, E-36310 Vigo, Spain
  • 3Group of Applied Physics, University of Geneva, CH-1211 Geneva, Switzerland
  • 4Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore

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Issue

Vol. 109, Iss. 26 — 28 December 2012

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