基于BBM92协议的量子密钥分发系统改进方案  

Improvement of performance of BBM92 quantum key distribution system

作　　者：吴张斌[1] 陈光[1] 杨伯君[1] 

机构地区：[1]北京邮电大学理学院光通信与光波技术教育部重点实验室,北京100876

出　　处：《量子电子学报》2009年第5期560-564,共5页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(60578043);北京市教委共建项目(XK100130937)

摘　　要：量子密钥分发所面临的最主要问题是如何实现高码率、远距离的量子密钥传输。为提高量子保密通信系统量子密钥生成的速率,将双探测器量子密钥分发方案应用于BBM92协议,并分别在理想纠缠光源、参量下转换纠缠光源两种情况下进行了数值仿真。对系统性能进行对比后得出:在BBM92协议中利用双探测器,量子密钥分发系统的密钥生成率明显高于单探测器系统,而误码率大幅度低于单探测器系统。理想光源情况下传输距离可扩展到300 km,参量下转换光源的情况下,传输距离也可达250 km。At present, the most important problem of quantum key distribution is how to realize the transmission for long distance and high key generation rate. Dual detectors are used in quantum distribution and simulations are performed for BBM92 quantum key distribution system with ideal parametric down conversion sources. Simulation results demonstrate improvements of keys generation in BBM92 protocol using dual detectors, as well as lower error bit rate. Secure communication distance key key and rate can reach 300km when ideal sources are introduced and 250kin with parametric down conversion sources.

关 键 词：量子光学 量子密钥分发 双探测器 BBM92协议 密钥生成率 

分 类 号：O431.2[机械工程—光学工程]