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<p>Quantum key distribution (QKD), which is based on the no-cloning theorem of quantum mechanics, provides information-theoretic security for private key distribution. Currently, QKD systems face limitations regarding cost, environmental adaptability, and secure key rates. Herein, we develop a time- and wavelength-division multiplexing (TWDM) method and demonstrate a practical 5 GHz phase modulation QKD system. This system, which is based on the Faraday-Michelson interferometer with adaptive polarization compensation, achieved a secure key rate of 4.084 ± 0.178 Mbps, operating continuously for over 30 h on a 50 km optical fiber channel.</p>

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Polarization self-compensation quantum key distribution system with 5 GHz modulation

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Peng-Lei Hao,
  • Wei Chen,
  • Shuang Wang,
  • Zhen-Qiang Yin,
  • De-Yong He,
  • Fang-Xiang Wang,
  • Shu-Feng Liu,
  • Sheng Zhou,
  • Yu Wang,
  • Guang-Can Guo,
  • Zheng-Fu Han

摘要

Quantum key distribution (QKD), which is based on the no-cloning theorem of quantum mechanics, provides information-theoretic security for private key distribution. Currently, QKD systems face limitations regarding cost, environmental adaptability, and secure key rates. Herein, we develop a time- and wavelength-division multiplexing (TWDM) method and demonstrate a practical 5 GHz phase modulation QKD system. This system, which is based on the Faraday-Michelson interferometer with adaptive polarization compensation, achieved a secure key rate of 4.084 ± 0.178 Mbps, operating continuously for over 30 h on a 50 km optical fiber channel.