单光子量子密钥分发系统中干涉稳定性分析

为了研究位相编码量子密钥分发系统中的干涉稳定性, 运用解析和数值计算方法详细研究了光纤双折射、温度变化、非对称性以及耦合器分光比对量子密钥分发系统干涉条纹可见度的影响, 结果表明光纤双折射、温度变化和非对称性都将影响系统的干涉可见度, 调整接收端的调制位相能消除温度变化的影响, 并减小非对称性对系统的影响, 但不能改善光纤双折射对系统干涉的影响. 另外, 耦合器分光比影响系统的效率.

Interference Stability Analysis of Quantum Key Distribution System Based on Single Photon

In order to study the interference stability in phase coded quantum key distribution (QKD) system, the influence that optical fiber birefringence, temperature variation, asymmetry and coupling ratio have on the interference visibility of the system is studied in details in this paper by using analytic and numerical methods. Further more, the influence of temperature variation and that of asymmetry could be eliminated and depressed respectively by adjusting of phase modulator in receiver. But the influence of birefringence could not be amended. In addition, the influence of the coupling ratio of coupler is limited to system efficiency only.