Photon-number-resolving decoy-state quantum key distribution

  title={Photon-number-resolving decoy-state quantum key distribution},
  author={Qing-yu Cai and Yong-gang Tan},
  journal={Physical Review A},
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… 
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