旋光-双反射结构的光子偏振态误差分析  

Polarization Error Analysis of Rotatory Double Reflection Structure

作　　者：赵顾颢[1] 赵尚弘[1] 幺周石[2] 蒙文[1] 王翔[1] 朱子行[1] 刘丰[2] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077 [2]中国空间技术研究院西安分院,陕西西安710000

出　　处：《中国激光》2013年第2期249-252,共4页Chinese Journal of Lasers

摘　　要：旋光-双反射结构能够利用反射镜自身的偏振特性,配合旋光晶体实现光子偏振态的自动补偿,以减小移动量子密钥分发系统中反射镜引入的量子误码率。而该结构要求两面反射镜偏振特性完全相同,旋光晶体能够实现90°的完美旋光。从反射镜不匹配和旋光晶体旋转角度不准确两个方面对旋光双反射结构的误差进行了分析。研究结果显示,选择折射率相对大的反射镜,并且保证旋光晶体之间和反射镜之间的差异尽可能小,可以保证输出偏振态的稳定。By using the polarization characteristics of reflection mirror and cooperating with magneto-optical crystals, the rotatory double reflection structure can automatically compensate the polarization of photoa;s. The polarization independent reflection structure can be used in the movable quantum key distribution system. The structure requires the polarizations of two mirrors to be absolutely the same and the rotatory angles of magneto- optical crystals to accurately reach 90;. The polarization error caused by mirror mismatch and rotatory angles deviating from 90° is analyzed. The result shows that if the difference between two magneto-optical crystals and two mirrors is kept small enough, good stability of polarization of output pulse can be kept.

关 键 词：量子光学 偏振无关反射结构 偏振误差 量子误码率 

分 类 号：O436[机械工程—光学工程]