Improved model on asynchronous measurement-device-independent quantum key distribution with realistic devices  

作　　者：Mingshuo Sun Chun-Hui Zhang Rui Zhang Xing-Yu Zhou Jian Li Qin Wang 孙铭烁;张春辉;章睿;周星宇;李剑;王琴(Institute of Quantum Information and Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;Broadband Wireless Communication and Sensor Network Technology,Key Laboratory of Ministry of Education,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;Changqing Oilfield Company Digital and Intelligent Business Division,China National Petroleum Corporation,Xi'an 710299,China)

机构地区：[1]Institute of Quantum Information and Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China [2]Broadband Wireless Communication and Sensor Network Technology,Key Laboratory of Ministry of Education,Nanjing University of Posts and Telecommunications,Nanjing 210003,China [3]Changqing Oilfield Company Digital and Intelligent Business Division,China National Petroleum Corporation,Xi'an 710299,China

出　　处：《Chinese Physics B》2024年第11期52-56,共5页中国物理B（英文版）

基　　金：Project supported by Natural Science Foundation of Jiangsu Province(Grant Nos.BE2022071 and BK20192001);the National Natural Science Foundation of China(Grant Nos.12074194,62101285,62471248,and 12104240);Postgraduate Research&Practice Innovation Program of Jiangsu Province(Grant No.KYCX220954).

摘　　要：In principle,the asynchronous measurement-device-independent quantum key distribution(AMDI-QKD)can surpass the key rate capacity without phase tracking and phase locking.However,practical imperfections in sources or detections would dramatically depress its performance.Here,we present an improved model on AMDI-QKD to reduce the influence of these imperfections,including intensity fluctuation,the afterpulse effect,and the dead time of detectors.Furthermore,we carry out corresponding numerical simulations.Simulation results show that,by implementing our present work,it can have more than 100 km longer secure transmission distance and one order of magnitude enhancement in the key generation rate after 320 km compared with the standard method.Moreover,our model can still break the Pirandola–Laurenza–Ottaviani–Banchi(PLOB)bound even under realistic experimental conditions.

关 键 词：asynchronous measurement-device-independent quantum key distribution intensity fluctuations afterpulse dead time 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]