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针对传统量子密钥分配协议安全密钥传输距离较短,难以实现长距离量子保密网的问题,提出了基于量子存储和纠缠光源(EPS)的测量设备无关量子密钥分配协议及其网络模型。比较了直接预报量子存储、非直接预报量子存储与基于EPS的量子存储的优劣,分析了基于量子存储和EPS的测量设备无关量子密钥分配系统中密钥生成率与安全传输距离、存储器量子态保持时间的关系。仿真结果表明,基于EPS的量子存储方案弥补了直接预报量子存储方案需要预报存储器的不足,安全传输距离远高于非直接预报量子存储方案,且当存储器的量子态保持时间T_1大于1 ms时,量子密钥生成率基本不再随T_1增大而增大。实验中采用双信道两用户网络模型,实际中可通过时分复用器和快速光开关实现单信道多用户的量子密钥分配网络。
Aiming at the problem that traditional quantum key distribution protocol has short security key transmission distance and difficult to realize long-distance quantum confidential network, an irrelevant quantum key distribution protocol and its network model based on quantum storage and entangled light source (EPS) are proposed. The advantages and disadvantages of direct prediction quantum memory, non-direct prediction quantum storage and EPS-based quantum storage are compared, and the relationship between key generation rate and secure transmission distance in quantum irrelevant quantum key distribution system based on quantum memory and EPS, memory quantum State to maintain the relationship between time. The simulation results show that EPS-based quantum storage schemes make up for the lack of forecasting memory required for direct-forecast quantum storage schemes, and the safe transmission distance is much higher than that of non-direct-forecast quantum storage schemes. When the memory quantum state holding time T_1 is greater than 1 ms, The quantum key generation rate basically no longer increases with T_1. In the experiment, a two-channel two-user network model is adopted. In practice, a single-channel and multi-user quantum key distribution network can be realized through a time division multiplexer and a fast optical switch.