Active phase compensation of quantum key distribution system |
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Authors: | Wei Chen ZhengFu Han XiaoFan Mo FangXing Xu Guo Wei GuangCan Guo |
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Institution: | (1) Key Lab of Quantum Information, University of Science and Technology of China, Hefei, 230026, China;(2) Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, 230026, China |
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Abstract: | 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- Michel- son 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 stan- dard 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 de- vices and thermal controller. |
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Keywords: | quantum key distribution Faraday-Michelson system phase drift active phase compensation |
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