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Real-time low-frequency vibration phase drift tracking and auto-compensation in phase-coded quantum key distribution system

Lu Yi-Qun Wang Fa-Qiang Zhao Feng Hu Min Lin Yi-Man Liao Chang-Jun Liu Song-Hao Guo Bang-Hong

Real-time low-frequency vibration phase drift tracking and auto-compensation in phase-coded quantum key distribution system

Lu Yi-Qun, Wang Fa-Qiang, Zhao Feng, Hu Min, Lin Yi-Man, Liao Chang-Jun, Liu Song-Hao, Guo Bang-Hong
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  • Abstract views:  3408
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  • Received Date:  01 October 2006
  • Accepted Date:  20 November 2006
  • Published Online:  20 July 2007

Real-time low-frequency vibration phase drift tracking and auto-compensation in phase-coded quantum key distribution system

  • 1. (1)华南师范大学光子信息技术广东省高校重点实验室,广州 510006; (2)华南师范大学光子信息技术广东省高校重点实验室,广州 510006;广东茂名学院计算机与电子信息学院,茂名 525000

Abstract: Phase drift caused by environment is the main source of quantum bit error rate and instability in the double M-Z interferometer quantum key distribution(QKD) system. The phase drift consists of both high-frequency and low-frequency vibrations, the former, which is due to environment noise, is usually conducted via the atmosphere and can be isolated by technological measures (e.g. using foamed-plastics wrapping or rubber pillow ), the latter comes from building-vibration, which vibrates slowly with a serious impact on M-Z interferometer, with a period of 3±0.32 min (min level). A novel real-time tracking and compensation method for phase drift caused by low-frequency vibration is proposed. With the improved scheme, the QKD system based on double M-Z interferometers can operate stably for 24 hours, and key exchange with an error below 6% over 75 kilometers has been achieved in the lab.

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