Analysis of the one-decoy-state SARG04 quantum cryptography protocol in the presence of afterpulse effects  

作　　者：Hu Nian Ya-Feng Nie Chun-Mei Zhang Liang-Liang Lu 

机构地区：[1]Key Laboratory of Optoelectronic Technology of Jiangsu Province,School of Physical Science and Technology,Nanjing Normal University,Nanjing 210023,China [2]Institute of Quantum Information and Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China [3]Hefei National Laboratory,Hefei 230088,China

出　　处：《Communications in Theoretical Physics》2024年第6期66-71,共6页理论物理通讯（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.12274233,62371244).

摘　　要：The SARG04 quantum key distribution protocol can offer greater robustness against photon number splitting attacks than the BB84 protocol that is implemented with weak pulses.In this paper,we propose a tight key analysis for the SARG04 protocol,by considering the one-decoy method and investigating its performance under the influence of a detector afterpulse.Our results demonstrate that an increase in block size leads to a slight increase in both the secure key rate and the maximum transmission distance.Importantly,the detector afterpulse plays a crucial role in practical applications and has a more pronounced effect on the SARG04 protocol compared to the BB84 protocol.

关 键 词：Quantum key distribution SARG04 protocol one decoy afterpulse 

分 类 号：TN918.4[电子电信—通信与信息系统] O413[电子电信—信息与通信工程]