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Optica Publishing Group
  • CLEO/Europe and IQEC 2007 Conference Digest
  • (Optica Publishing Group, 2007),
  • paper JSI2_1

Decoy state protocols for quantum cryptography with parametric down conversion sources

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Abstract

Currently, a weak coherent state is widely used as an imperfect single photon source for quantum key distribution (QKD). We call this implementation coherent state QKD. The coherent state QKD suffers from photon-number splitting PNS attacks. Nevertheless, it has been proven unconditionally secure with a security proof by Gottesman, Lo, Liitkenhaus, and Preskill (GLLP), though the performance in terms of the achievable secure distance and the key rate are limited. Decoy state method has been first proposed by Hwang as a useful method for substantially improving the performance of the coherent state QKD. The security of QKD with decoy states has been proven by our group [1]. Asymptotically, the coherent state QKD with decoy states is able to operate as good as QKD with perfect single photon sources in the sense that the key generation rates given by both setups depend linearly on the channel transmittance. Afterwards, some practical decoy-state protocols are proposed by our group and also by Wang. Our group has recently performed the first experimental demonstrations of decoy state QKD. Our work has been followed by a number of research groups in the world.

© 2007 IEEE

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