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Phys. Rev. A 73, 032305 (2006) [5 pages]

Photon-number-resolving decoy-state quantum key distribution

Qing-yu Cai1 and Yong-gang Tan1,2
1State Key Laboratory of Magnetic Resonances and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071, People's Republic of China
2Graduation University of Chinese Academy of Sciences, Beijing 100081, People's Republic of China

Received 30 March 2005; published 3 March 2006

In this paper, a photon-number-resolving decoy-state quantum key distribution (QKD) scheme is presented based on recent experimental advancements. A new upper bound on the fraction of counts caused by multiphoton pulses is given, which seems inherent as long as weak coherent sources and high lossy channel are used. This implies that our scheme is optimal in long-distance QKD with weak coherent sources. We show that Eve's coherent multiphoton pulse (CMP) attack is more efficient than a symmetric individual attack when the quantum bit error rate is small, so that the CMP attack should be considered to ensure the security of the final key. Our results show that a not-so-weak pulse can be used to transmit the key. Optimal intensity of the laser source is presented which provides a 23.9  km increase in the transmission distance.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.73.032305
DOI: 10.1103/PhysRevA.73.032305
PACS: 03.67.Dd
  • 03.67.Dd
    Quantum cryptography
  • YEAR: 2006
KEYWORDS: quantum cryptography, quantum optics, multiphoton processes

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