基于最小二乘法的相位编码QKD中的主动相位补偿  

Active phase compensation in phase encoded QKD system based on least square algorithm

作　　者：曹正文[1,2] 刘佳[1] 冯晓毅[2] 邓雨晨[1] 白亚波[1] 

机构地区：[1]西北大学信息科学与技术学院,陕西西安710127 [2]西北工业大学电子信息学院,陕西西安710072

出　　处：《光电子．激光》2014年第5期998-1002,共5页Journal of Optoelectronics·Laser

基　　金：陕西省教育厅自然科学专项(12JK0497);陕西省科技厅自然科学基金(2013JM8036)资助项目

摘　　要：为解决相位编码的量子通讯系统中量子密钥相位漂移问题,以降低量子密钥分发(QKD),系统的误码率,克服已有算法存在的计算量大、测量精度低和复杂度高等问题,提出了基于最小二乘的主动相位补偿算法,可在单光子情况下通过扫描少量相位点,应用最小二乘法,即可获得较高精度的相位补偿。实验仿真表明,本文算法可以在较短的时间内得到相位漂移参数并进行实时主动补偿,提高了QKD系统的运行效率和性能。Phase drift is the main source of errors for phase encoding quantum key distribution （QKD） system, and it is an important factor influencing the practical applications of the system. At present, there are some kinds of methods to Solve the phase drift problem. They may reduce the phase drift to some ex- tent, but they also have many shortcomings, such as large amount of calculation, low accuracy and com- plex system. In this paper, we put forward a kind of active phase compensation method based on least squares. Scanning a small number phase points under the condition of a single photon,we can get phase compensation parameters by applying the least square algorithm. The experimental results show that the method gains phase drift parameter in shorter time with less computational cost to complete the real- time active compensation. It can improve the QKD system＇s performance and efficiency to a certain ex- tent.

关 键 词：量子密钥分发(QKD) 相位漂移 主动相位补偿 最小二乘 

分 类 号：TN918[电子电信—通信与信息系统]