基于实际探测器补偿的离散调制连续变量测量设备无关量子密钥分发方案  

Discrete modulation continuous-variable measurement-device-independent quantum key distribution scheme based on realistic detector compensation

作　　者：吴晓东 黄端 黄鹏[3] 郭迎[4] Wu Xiao-Dong;Huang Duan;Huang Peng;Guo Ying(School of Management,Fujian University of Technology,Fuzhou 350118,China;School of Computer Science and Engineering,Central South University,Changsha 410083,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Center for Quantum Sensing and Information Processing,Shanghai Jiao Tong University,Shanghai 200240,China;School of Automation,Central South University,Changsha 410083,China)

机构地区：[1]福建工程学院管理学院,福州350118 [2]中南大学计算机学院,长沙410083 [3]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,量子传感与信息处理中心,上海200240 [4]中南大学自动化学院,长沙410083

出　　处：《物理学报》2022年第24期50-59,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61871407,61872390,61801522);福建工程学院科研启动基金(批准号:GY-Z22042)资助的课题。

摘　　要：由于离散调制连续变量测量设备无关量子密钥分发方案与高效纠错码具有良好的兼容性,因此即使在低信噪比条件下,也具备较高的协商效率,并且其实现条件相比于高斯调制方案更加简单.然而,实验中常用的零差探测器的量子效率仅为0.6,这会严重影响离散调制连续变量测量设备无关量子密钥分发方案的实际应用性能.鉴于此,本文提出基于实际探测器补偿的离散调制连续变量测量设备无关量子密钥分发方案,即在该方案中对两条量子信道的输出端各采用一个相位敏感放大器用于补偿相对应的实际零差探测器.仿真结果表明采用相位敏感放大器能够很好地补偿实际零差探测器的量子效率,有效提升基于实际探测器的离散调制连续变量测量设备无关量子密钥分发方案的密钥率和安全传输距离,为推动离散调制连续变量测量设备无关量子密钥分发方案的实用化发展提供了一个有效而实用的方法.Discrete modulation continuous variable measurement device independent quantum key distribution scheme has good compatibility with efficient error correction codes,which leads to high reconciliation efficiency even at low signal-to-noise ratio.Besides,the implementation of this protocol is simpler than that of Gaussian modulation scheme.However,the quantum efficiency of homodyne detector commonly used in the experiment is only 0.6,which will seriously affect the practical application performance of discrete modulation continuous variable measurement device independent quantum key distribution scheme.To solve this problem,we propose a discrete modulation continuous variable measurement device independent quantum key distribution scheme based on realistic detector compensation.In our scheme,for the outputs of two quantum channels,each adopts a phase sensitive amplifier to compensate for the corresponding realistic homodyne detector.The simulation results show that the phase sensitive amplifier can well compensate for the quantum efficiency of the realistic detector and effectively improve the performance of the discrete modulation continuous variable measurement device independent quantum key distribution scheme with realistic detector in terms of secret key rate and secure transmission distance.The proposed protocol provides an effective method for promoting the practical development of the discrete modulation continuous variable measurement device independent quantum key distribution scheme.

关 键 词：离散调制 连续变量 测量设备无关量子密钥分发 实际探测器补偿 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]