基于量子存储和纠缠光源的测量设备无关量子密钥分配网络  

Measurement Device Independent Quantum Key Distribution Network Based on Quantum Memory and Entangled Photon Sources

作　　者：孙颖[1] 赵尚弘[1] 东晨[1,2] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077 [2]西安通信学院信息安全系,陕西西安710006

出　　处：《光学学报》2016年第3期238-244,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61106068)

摘　　要：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。The long-distance quantum key distribution network is difficult, since the secure transmission distance of traditional quantum key distribution （QKD） is not long enough. To overcome this problem, A measurement device independent （MDI） QKD protocol based on quantum memories（QM） and entangled photon sources（EPS） is proposed, as well as its network model. And indirectly heralding QM scheme and directly heralding QM with QM scheme based on EPS are compared. The relationships of the key generation rate, secure transmission distance, and hold time of quantum state about MDI-QKD protocol based on QM and EPS are also analyzed. The simulation results show that MDI-QKD based on QM and EPS compensate for the lack of MDI-QKD based on directly heralding QM, which is necessary for heralding QM, and the secure transmission distance is far higher than traditional MDIQKD and general MDI-QKD based on indirectly heralding QM. Furthermore, once the hold time of quantum state is greater than 1 ms, the key generation rate will be almost invariable. The double-channel and two-user network model are employed. The single-channel and multi-user QKD network can be implemented with time division multiplexer and fast optical switch.

关 键 词：量子光学 测量设备无关 量子密钥分配网络 量子存储 纠缠光源 

分 类 号：O431[机械工程—光学工程] TN918[理学—光学]