一种可提高安全通信距离的诱骗态量子密钥分发方案

doi:10.3969/j.issn.1001-2400.2010.01.003

Abstract

Abstract:

To increase the security distance of quantum communication, a new scheme of decoy state quantum key distribution with a modified coherent state is proposed. The probability of multi-photon pulse in weak coherent source can be decreased by canceling two photon pulses to improve the security distance. Based on the math model of the decoy state QKD, the formula for the yield and error rate of the single photon pulse with the Modified Coherent State is deduced, and substituted in GLLP to calculate the generation rate of quantum keys. Results show that the decoy state with the Modified Coherent State can increase the secure communication distance about 10％, which is very close to that of the perfect decoy state QKD.

Key words: quantum communication, quantum key distribution, modified coherent state, decoy state

LIU Dan;PEI Chang-xing;QUAN Dong-xiao;HAN Bao-bin;ZHAO Nan. New decoy state quantum key distribution for increasing the security communication distance[J].J4, 2010, 37(1): 13-17.

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New decoy state quantum key distribution for increasing the security communication distance

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