光纤量子密钥分发系统中密钥传输率和误码率的研究  

Study on key transmission rate and BER of fiber-based quantum key distribution system

作　　者：刘伟[1] 杨树[1] 郭爱鹏[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：《光通信技术》2008年第8期44-47,共4页Optical Communication Technology

基　　金：北京市教委共建项目(XK100130737)资助。

摘　　要：通过理论分析和计算,研究了光纤损耗、色散和单光子探测器暗计数等因素对量子密钥分发系统密钥传输率和误码率的影响。研究表明,光纤损耗是影响密钥传输率的主要因素。而量子比特误码率则与光纤损耗、色散、脉冲宽度、单光子探测器暗计数以及瑞利反向散射等因素有关。在实验中,应尽量降低光纤损耗、色散和单光子探测器的暗计数,同时选择适当的初始脉宽,从而提高密钥传输率并降低误码率,进而提高量子密钥分发系统的传输距离。The effects of fiber dispersion and loss and single-photon detector dark counts on key transmission rate and BER of quantum key distribution system through theoretical analysis and computation are studied. Research demonstrates that fiber loss is the main factor that influences quantum key transmission rate, while quantum BER is related to fiber loss, dispersion, pulse width, dark counts and Rayleigh backscattering. In the experiment, we should try to reduce fiber loss, dispersion and single-photon detector dark counts, and meanwhile choose appropriate initial pulse width, thereby enhancing quantum key transmission rate and reducing BER, thus effectively enhance the transmission distance of quantum key distribution system.

关 键 词：光纤损耗 光纤色散 暗计数 量子密钥分发 

分 类 号：TN929.11[电子电信—通信与信息系统]