中国物理B ›› 2026, Vol. 35 ›› Issue (4): 44208-044208.doi: 10.1088/1674-1056/ade072

• • 上一篇    下一篇

Simultaneous frequency stabilization of two 1550-nm lasers at single-photon level

Bo Yu(于波)1,†, Zhenqiang Yin(银振强)2,3,4,5, Weijie Ding(丁伟杰)1, Hui Yang(杨慧)1, and Weixin Liu(刘伟新)1   

  1. 1 Department of Physics, Xinzhou Normal University, Xinzhou 034000, China;
    2 CAS (Chinese Academy of Sciences) Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
    3 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
    4 Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China;
    5 Anhui Province Key Laboratory of Quantum Network, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2025-04-21 修回日期:2025-06-03 接受日期:2025-06-04 发布日期:2026-04-01
  • 通讯作者: Bo Yu E-mail:yb@xztu.edu.cn
  • 基金资助:
    Project supported by the Fundamental Research Program of Shanxi Province, China (Grant No. 202403021211084) and the Science and Technology Program of Xinzhou City, Shanxi Province, China (Grant No. 20240509).

Simultaneous frequency stabilization of two 1550-nm lasers at single-photon level

Bo Yu(于波)1,†, Zhenqiang Yin(银振强)2,3,4,5, Weijie Ding(丁伟杰)1, Hui Yang(杨慧)1, and Weixin Liu(刘伟新)1   

  1. 1 Department of Physics, Xinzhou Normal University, Xinzhou 034000, China;
    2 CAS (Chinese Academy of Sciences) Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
    3 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
    4 Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China;
    5 Anhui Province Key Laboratory of Quantum Network, University of Science and Technology of China, Hefei 230026, China
  • Received:2025-04-21 Revised:2025-06-03 Accepted:2025-06-04 Published:2026-04-01
  • Contact: Bo Yu E-mail:yb@xztu.edu.cn
  • Supported by:
    Project supported by the Fundamental Research Program of Shanxi Province, China (Grant No. 202403021211084) and the Science and Technology Program of Xinzhou City, Shanxi Province, China (Grant No. 20240509).

摘要: The twin-field quantum key distribution (TF-QKD) requires that two lasers hundreds of kilometers apart must have the same frequency to achieve the high single-photon interference visibility. This means that both lasers need to be stabilized to the same frequency reference. A simple and robust system is presented for simultaneously stabilizing two 1550-nm lasers at the single-photon level. By utilizing the single-photon multi-frequency modulation technology, both the fiber laser and distributed feedback (DFB) laser are stabilized to the $\pi $-phase shifted fiber Bragg grating at the same time. The frequency fluctuations of fiber laser and DFB laser are bounded within 1.39 MHz and 1.53 MHz over 2000 s, respectively. These two frequency-stabilized 1550-nm lasers could be used for TF-QKD.

关键词: single-photon multi-frequency modulation, frequency stabilization, π-phase shifted fiber Bragg grating

Abstract: The twin-field quantum key distribution (TF-QKD) requires that two lasers hundreds of kilometers apart must have the same frequency to achieve the high single-photon interference visibility. This means that both lasers need to be stabilized to the same frequency reference. A simple and robust system is presented for simultaneously stabilizing two 1550-nm lasers at the single-photon level. By utilizing the single-photon multi-frequency modulation technology, both the fiber laser and distributed feedback (DFB) laser are stabilized to the $\pi $-phase shifted fiber Bragg grating at the same time. The frequency fluctuations of fiber laser and DFB laser are bounded within 1.39 MHz and 1.53 MHz over 2000 s, respectively. These two frequency-stabilized 1550-nm lasers could be used for TF-QKD.

Key words: single-photon multi-frequency modulation, frequency stabilization, π-phase shifted fiber Bragg grating

中图分类号:  (Lasers)

  • 42.55.-f
42.60.Fc (Modulation, tuning, and mode locking) 42.79.Dj (Gratings)