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.
出处
《光学学报》
EI
CAS
CSCD
北大核心
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
关键词
量子通信
相位编码
概率波
磁光效应
quantum communications
phase coding
probability wave
magneto-optical effect
