磁光效应对量子相位编码系统的影响分析  

Analysis of Influence of Magneto-Optical Effect on Quantum Key Distribution System with Phase Coding

作　　者：韩宝彬[1] 裴昌幸[1] 刘丹[1] 

机构地区：[1]西安电子科技大学综合业务网及关键技术国家重点实验室,陕西西安710071

出　　处：《光学学报》2010年第11期3328-3331,共4页Acta Optica Sinica

基　　金：国家自然科学基金(60572147;60672119);国家重点实验室专项基金(ISN02080002);高等学校创新引智计划(B08038)资助课题

摘　　要：受光纤双折射的影响,单光子极化态在光纤中传输时容易发生慢变进而影响到量子密钥分发系统的性能。利用概率波叠加理论分析了法拉第旋转镜的时分复用干涉仪相位编码系统。分析结果表明,利用单光子往返通过同一根光纤可以有效抵消光纤双折射的影响,但容易受到非互易性效应如磁光效应的影响。随着磁光旋转角的增加,成功到达干涉仪的单光子形成正常干涉条纹的概率逐渐减小。旋转角大于42°时,形成正常干涉条纹的概率接近于零。Being affected by birefringence,the polarization state of single photon is randomly and slowly altered during the transmission in single mode fiber.This influences the performance of quantum key distribution system.The ＂plug and play＂ system with Faraday rotation mirror is theoretically analyzed by the use of probability wave superposition.The results show that the bidirectional transmission of a single photon through the same fiber can effectively offset the influence of fiber birefringence,but is vulnerable to nonreciprocity effects such as magneto-optical effect.The probability of normal interference fringes,formed by the single photon reaching the interferometer successfully,decreases with the increase of magneto-optical rotation angle.When the rotation angle is greater than 42°,the probability of forming the normal interference fringes is close to 0.

关 键 词：量子通信 相位编码 概率波 磁光效应 

分 类 号：O436.4[机械工程—光学工程]