非理想情况下的实时偏振控制算法  

Real-Time Polarization Control Algorithm under Non-Ideal Situation

作　　者：张启业[1] 朱勇[1] 苏洋[1] 王德双[1] 杨龙[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京21007

出　　处：《激光与光电子学进展》2013年第9期34-40,共7页Laser & Optoelectronics Progress

基　　金：江苏省自然科学基金(BK2012508)

摘　　要：在基于偏振编码的BB84协议的量子密钥分发(QKD)系统中,偏振控制系统是关键的一个环节。为了能够高效快速地恢复并稳定因光纤链路抖动以及环境温度变化等因素而受损的偏振态,分析了电动偏振控制器(EPC)的性能,引入了旋转矩阵作为偏振控制器的Müller矩阵,提出了规避盲区的策略,设计了非理想情况下的实时偏振控制算法。该算法在局部控制过程中只使用两个控制自由度即可完成期望输出的偏振态,极大地提高了控制速度。仿真结果验证了算法的可行性。In the receiving end of quantum key distribution （QKD） system based on the polarization encoded BB84 protocol, the polarization control system is very key to QKD. In order to recover and stabilize very efficiently the damaged polarization states owing to these factors including the optical fiber, environment temperature and so on, the performance of the electric polarization controller （EPC） is analyzed and rotation matrix is introduced as the Mueller matrix of the EPC. A strategy of avoiding the blind zone is put forward and the real-time polarization control algorithm is designed in the non-ideal situation. The algorithm shows that every control process uses only two degrees of freedom to transform all possible polarization states and can improve greatly the rate of the controlling. Simulation results show that this algorithm is feasible.

关 键 词：量子光学 量子光通信 偏振控制算法 旋转轴 偏振控制器 缪勒矩阵 

分 类 号：TN929.11[电子电信—通信与信息系统]