Real-time compensation of phase drift for phase-encoded quantum key distribution systems |
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| Authors: | LiJun Zhang YongGang Wang ZhenQiang Yin Wei Chen Yang Yang Tao Zhang DaJun Huang Shuang Wang FangYi Li ZhengFu Han |
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| Institution: | (2) Center for Quantum Information and Quantum Control, Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Canada; |
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| Abstract: | Phase drift is an inherent problem in phase-encoded quantum key distribution (QKD) systems. The current active phase tracking
and compensation solutions cannot satisfy the requirements of a system with nonlinearity in phase modulation. This paper presents
a four-phase scanning method, which is based on the quantitative analysis of the quantum bit error rate (QBER) from phase
drift and the performance requirements of phase compensation. By obtaining the four interference fringes and adjusting the
coding matrix of the system, this method automatically calculates the accurate driving voltages for the phase modulator. The
implementation and experimental tests show that the proposed method can compensate phase drift caused by environmental changes
and the system’s nonlinearity, and is applicable to large-scale QKD networks. |
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| Keywords: | quantum key distribution phase-coding phase drift active phase compensation four-phase scanning method FPGA |
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