Finite-key analysis of practical time-bin high-dimensional quantum key distribution with afterpulse effect  

作　　者：Yu Zhou Chun Zhou Yang Wang Yi-Fei Lu Mu-Sheng Jiang Xiao-Xu Zhang Wan-Su Bao 周雨;周淳;汪洋;陆宜飞;江木生;张晓旭;鲍皖苏(Henan Key Laboratory of Quantum Information and Cryptography,SSF IEU,Zhengzhou 450001,China;Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]Henan Key Laboratory of Quantum Information and Cryptography,SSF IEU,Zhengzhou 450001,China [2]Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Physics B》2022年第8期234-240,共7页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2020YFA0309702);the National Natural Science Foundation of China(Grant Nos.62101597,61605248,61675235,and 61505261);the China Postdoctoral Science Foundation(Grant No.2021M691536);the Natural Science Foundation of Henan Province,China(Grant Nos.202300410534 and 202300410532);the Anhui Initiative Fund in Quantum Information Technologies。

摘　　要：High-dimensional quantum resources provide the ability to encode several bits of information on a single photon,which can particularly increase the secret key rate rate of quantum key distribution(QKD) systems. Recently, a practical four-dimensional QKD scheme based on time-bin quantum photonic state, only with two single-photon avalanche detectors as measurement setup, has been proven to have a superior performance than the qubit-based one. In this paper, we extend the results to our proposed eight-dimensional scheme. Then, we consider two main practical factors to improve its secret key bound. Concretely, we take the afterpulse effect into account and apply a finite-key analysis with the intensity fluctuations.Our secret bounds give consideration to both the intensity fluctuations and the afterpulse effect for the high-dimensional QKD systems. Numerical simulations show the bound of eight-dimensional QKD scheme is more robust to the intensity fluctuations but more sensitive to the afterpulse effect than the four-dimensional one.

关 键 词：HIGH-DIMENSIONAL time-bin finite-key analysis intensity fluctuations afterpulse effect 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]