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Practical non-orthogonal decoy state quantum key distribution with heralded single photon source 被引量：4

Practical non-orthogonal decoy state quantum key distribution with heralded single photon source
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摘要 Recently the performance of the quantum key distribution （QKD） is substantially improved by the decoy state method and the non-orthogonal encoding protocol, separately. In this paper, a practical non-orthogonal decoy state protocol with a heralded single photon source （HSPS） for QKD is presented. The protocol is based on 4 states with different intensities. i.e. one signal state and three decoy states. The signal state is for generating keys; the decoy states are for detecting the eavesdropping and estimating the fraction of single-photon and two-photon pulses. We have discussed three cases of this protocol, i.e. the general case, the optimal case and the special case. Moreover, the final key rate over transmission distance is simulated. For the low dark count of the HSPS and the utilization of the two-photon pulses, our protocol has a higher key rate and a longer transmission distance than any other decoy state protocol. Recently the performance of the quantum key distribution （QKD） is substantially improved by the decoy state method and the non-orthogonal encoding protocol, separately. In this paper, a practical non-orthogonal decoy state protocol with a heralded single photon source （HSPS） for QKD is presented. The protocol is based on 4 states with different intensities. i.e. one signal state and three decoy states. The signal state is for generating keys; the decoy states are for detecting the eavesdropping and estimating the fraction of single-photon and two-photon pulses. We have discussed three cases of this protocol, i.e. the general case, the optimal case and the special case. Moreover, the final key rate over transmission distance is simulated. For the low dark count of the HSPS and the utilization of the two-photon pulses, our protocol has a higher key rate and a longer transmission distance than any other decoy state protocol.
作者 米景隆 王发强 林青群 梁瑞生
机构地区 Laboratory of Photonic Information Technology
出处 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第4期1178-1183,共6页 中国物理B（英文版）
基金 Project supported by the National Natural Science Foundation of China (Grant No 60578055) the State Key Development Program for Basic Research of China (Grant No 2007CB307001)
关键词 quantum key distribution decoy state non-orthogonal encoding protocol heralded single photon source quantum key distribution, decoy state, non-orthogonal encoding protocol, heralded single photon source
分类号 O431.2 [机械工程—光学工程]
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参考文献22

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同被引文献29

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Chinese Physics B
2008年 第4期

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