Active phase compensation of quantum key distribution system
Active phase compensation of quantum key distribution system
复制标题
量子密钥分配系统的有源相位补偿
DOI：
10.1007/s11434-008-0023-0
复制
发表时间：
2008-05-01
影响因子：
--
通讯作者：
Guo GuangCan
中科院分区：
文献类型：
--
作者：
Chen Wei;Han ZhengFu;Guo GuangCan
量子密钥分发系统在实际通信中必须具有足够的鲁棒性。除了光纤的双折射外，相位漂移对系统的性能也有很大的影响。Faraday-Michelson量子密钥分发系统可以自动补偿光纤的双折射，但在实际应用中，相移仍然是一个严重的问题。本文分析了法拉第-迈克尔逊量子密钥分配系统中相位漂移产生的主要原因及其对系统的影响，提出了一种有效的有源相位补偿方案。通过这种方法，我们证明了量子密钥分配系统，可以稳定地运行在37公里的光纤在实际工作条件下的长时间平均量子比特错误率为1.59%，标准偏差为0.46%。这一结果表明，主动相位补偿方案适用于基于双非对称干涉仪的实际QKD系统，无需额外的器件和热控制器。
Quantum key distribution (QKD) system must be robust enough in practical communication. Besides birefringence of fiber, system performance is notably affected by phase drift. The Faraday-Michelson QKD system can auto-compensate the birefringence of fiber, but phase shift is still a serious problem in its practical operation. In this paper, the major reason of phase drift and its effect on Faraday-Michelson QKD system is analyzed and an effective active phase compensation scheme is proposed. By this means, we demonstrate a quantum key distribution system which can stably run over 37-km fiber in practical working condition with the long-time averaged quantum bit error rate of 1.59% and the standard derivation of 0.46%. This result shows that the active phase compensation scheme is suitable to be used in practical QKD systems based on double asymmetric interferometers without additional devices and thermal controller.