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提出一种基于预报单光子源和探测器诱骗态的循环差分相移量子密钥分发协议,简称HSPS-DD-RRDPSQKD协议。在详细推导协议密钥生成率的基础上,给出了相关数值仿真,并分别与基于弱相干光源和探测器诱骗态的循环差分相移量子密钥分发(WCS-DD-RRDPS-QKD)协议和诱骗态的BB84协议进行了性能比较。结果表明,随着脉冲序列长度L的增大,其密钥生成率和最远传输距离都相应减小;当脉冲序列长度L=16时,HSPS-DDRRDPS-QKD协议较WCS-DD-RRDPS-QKD协议,安全通信距离提高了约100km,密钥生成率提升了近一个数量级;当系统错误率为9.5%时,HSPS-DD-RRDPS-QKD协议的密钥生成率较诱骗态的BB84协议的提升了近两个数量级。
This paper proposes a cyclic differential phase shift quantum key distribution protocol based on single-photon source and detector-decoy state prediction, referred to as HSPS-DD-RRDPSQKD protocol. Based on the derivation of the protocol key generation rate in detail, the numerical simulation is given and compared with the WCS-DD-RRDPS-QKD protocol based on the coherent light source and the probe-decoy state respectively And the lure of the BB84 protocol performance comparison. The results show that the key generation rate and the farthest transmission distance decrease with the increase of pulse sequence length L. Compared with WCS-DD-RRDPS-QKD protocol, when the pulse sequence length L = 16, QKD protocol, the secure communication distance is increased by about 100km and the key generation rate is increased by nearly one order of magnitude. When the system error rate is 9.5%, the key generation rate of the HSPS-DD-RRDPS-QKD protocol is higher than that of the tricked BB84 protocol Increased by nearly two orders of magnitude.