J4 ›› 2009, Vol. 26 ›› Issue (5): 560-564.

• 量子光学 • 上一篇    下一篇

基于BBM92协议的量子密钥分发系统改进方案

吴张斌 陈光 杨伯君   

  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
  • 出版日期:2009-09-28 发布日期:2009-08-27
  • 通讯作者: 杨伯君(1938-),男,教授,博士生导师,主要研究方向为量子通信. E-mail:bojunyang99@sina.com
  • 作者简介:吴张斌(1984- ),男,陕西人,硕士研究生,主要从事量子通信方面的研究 Email: wuzbin@gmail.com
  • 基金资助:

    国家自然科学基金(NO.60578043); 北京市教委共建项目(NO.XK100130937 )

Improve the performance of BBM92 quantum key distribution system

WU Zhang-Bin, CHEN Guang, YANG Bo-Jun   

  1. School of Science, Beijing University of Posts and Telecommunications, Key Laboratory of Optical Communication and Lightwave Technologies, Ministry of Education, Beijing, 100876, China
  • Published:2009-09-28 Online:2009-08-27

摘要:

目前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,和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300km,参量下转换光源的情况下,传输距离也可达250km。

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

Abstract:

At present the most important problem of quantum key distribution is how to realize the key transmission for long distance and high key generation rate.We apply the idea of using dual detectors in quantum key distribution and perform simulations for BBM92 quantum key distribution system with ideal and parametric down conversion sources. Simulation results demonstrate significant improvements of keys generation rate in BBM92 protocol using dual detectors, as well as lower error bit rate. Secure communication distance can reach 300km when ideal sources are introduced and 250km with parametric down conversion sources.

Key words: quantum optics, quantum key distribution, dual detectors, BBM92 protocol, key generation rate