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Polarization Division Multiplexing CV-QKD with Pilot-Aided Polarization-State Sensing

Author

Listed:
  • Zicong Tan

    (State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China
    Hefei National Laboratory, CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China)

  • Tao Wang

    (State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China
    Hefei National Laboratory, CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China
    Shanghai Research Center for Quantum Sciences, Shanghai 201315, China)

  • Yuehan Xu

    (State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China
    Hefei National Laboratory, CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China)

  • Xu Liu

    (State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China
    Hefei National Laboratory, CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China)

  • Lang Li

    (State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China
    Hefei National Laboratory, CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China)

  • Beibei Zhang

    (State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China
    Hefei National Laboratory, CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China)

  • Yuchao Liu

    (State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China
    Hefei National Laboratory, CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China)

  • Peng Huang

    (State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China
    Hefei National Laboratory, CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China
    Shanghai Research Center for Quantum Sciences, Shanghai 201315, China)

  • Guihua Zeng

    (State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China
    Hefei National Laboratory, CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China
    Shanghai Research Center for Quantum Sciences, Shanghai 201315, China)

Abstract

Continuous-variable quantum key distribution (CV-QKD) with local local oscillator (LLO) is well-studied for its security and simplicity, but enhancing performance and interference resistance remains challenging. In this paper, we utilize polarization division multiplexing (PDM) to enhance spectral efficiency and significantly increase the key rate of the CV-QKD system. To address dynamic changes in the state of polarization (SOP) in Gaussian modulated coherent states (GMCS) signals due to polarization impairment effects, we designed a time-division multiplexing pilot scheme to sense and recover changes in SOP in GMCS signals, along with other digital signal processing methods. Experiments over 20 km show that our scheme maintains low excess noise levels (0.062 and 0.043 in shot noise units) and achieves secret key rates of 4.65 Mbps and 5.66 Mbps for the two polarization orientations, totaling 10.31 Mbps. This work confirms the effectiveness of PDM GMCS-CV-QKD and offers technical guidance for high-rate QKD within metropolitan areas.

Suggested Citation

  • Zicong Tan & Tao Wang & Yuehan Xu & Xu Liu & Lang Li & Beibei Zhang & Yuchao Liu & Peng Huang & Guihua Zeng, 2024. "Polarization Division Multiplexing CV-QKD with Pilot-Aided Polarization-State Sensing," Mathematics, MDPI, vol. 12(22), pages 1-16, November.
    • Handle: RePEc:gam:jmathe:v:12:y:2024:i:22:p:3599-:d:1522962
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