论文摘要
High-dimensional quantum states key distribution（HD-QKD） can enable more than one bit per photon and tolerate more noise. Recently, a practical HD-QKD system based on time-phase states has provided a secret key at Mbps over metropolitan distances. For the purposes of further improving the secret key rate of a practical HD-QKD system, we make two main contributions in this work. Firstly, we present an improved parameter estimation for this system in the finite-key scenario based on the Chernoff bound and the improved Chernoff bound. Secondly, we analyze how the dimension d affects the performance of the practical HD-QKD system.We present numerical simulations about the secret key rate of the practical HD-QKD system based on different parameter estimation methods. It is found that using the improved Chernoff bound can improve the secret key rate and maximum channel loss of the practical HD-QKD system. In addition, a mixture of the 4-level and 8-level practical HD-QKD system can provide better performance in terms of the key generation rate over metropolitan distances.
论文目录
文章来源
类型: 期刊论文
作者: 甘亚辉,汪洋,鲍皖苏,何如适,周淳,江木生
来源: Chinese Physics Letters 2019年04期
年度: 2019
分类: 基础科学,信息科技
专业: 物理学,电信技术
单位: Henan Key Laboratory of Quantum Information and Cryptography, Zhengzhou Information Science and Technology Institute,Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China
基金: the National Basic Research Program of China under Grant No 2013CB338002,the National Natural Science Foundation of China under Grant Nos 61505261,61675235,61605248 and 11304397
分类号: O413;TN918
页码: 5-9
总页数: 5
文件大小: 543K
下载量: 25
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