基于标记配对相干光源的模式匹配量子密钥分发协议  

Mode-Pairing Quantum Key Distribution Based on Heralded Pair-Coherent Source

作　　者：周艺华[1,2] 田雨薇 杨宇光 侍伟敏[1,2] ZHOU Yihua;TIAN Yuwei;YANG Yuguang;SHI Weimin(College of Computer Science,Beijing University of Technology,Beijing 100124,China;Beijing Key Laboratory of Trusted Computing,Beijing 100124,China)

机构地区：[1]北京工业大学计算机学院,北京100124 [2]可信计算北京市重点实验室,北京100124

出　　处：《北京邮电大学学报》2024年第6期24-29,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(62071015)。

摘　　要：模式匹配量子密钥分发协议一般使用弱相干光源作为信号光源,其中单光子成分较少,导致模式匹配量子密钥分发的密钥率受到限制。对此,提出了一种基于标记配对相干光源的模式匹配密钥分发协议,将标记配对相干光源作为模式匹配量子密钥分发的信号光源,凭借标记配对相干光源中单光子比例更高的优势,提高了模式匹配量子密钥分发的性能。在渐进和无穷多诱骗态的情况下,对所提协议的密钥率进行了数值模拟。仿真实验结果表明,所提协议与使用弱相干光源作为信号光源的模式匹配量子密钥分发协议相比,不仅有更高的密钥率,而且传输距离更远,当传输距离大于400 km时,所提协议在密钥率方面的优势更加明显。The key rate of mode-pairing quantum key distribution is limited because of using weak coherent sources as signal light sources,characterized by a limited single photon component.To address this problem,mode-pairing quantum key distribution based on heralded pair-coherent sourceis proposed,the heralded pair-coherent source is used as the signal light source in mode-pairing quantum key distribution.Due to the higher proportion of single photons in the heralded pair-coherent source,the performance of mode-pairing quantum key distribution is significantly improved.The numerical simulation is carried out in the cases of asymptotic and infinite decoy states.The result shows that the proposed protocol outperforms the mode-pairing quantum key distribution based on the weak coherent source,achieving not only a higher key rate but also a longer communication distance.The proposed protocol demonstrates a significant advantage in terms of the key rate when the transmission distance exceeds 400 km.

关 键 词：量子密钥分发 模式匹配量子密钥分发 标记配对相干光源 安全密钥率 

分 类 号：O436[机械工程—光学工程]