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<p>To fully exploit the potential of quantum technologies, quantum networks are needed to link different systems, enhancing applications in computing, cryptography and metrology. Central to these networks are quantum relays that can facilitate long-distance entanglement distribution and quantum communication. In this work, we present a modular and scalable quantum relay architecture using a high-quality single-photon source. The proposed network incorporates three untrusted intermediate nodes and is capable of a repetition rate of 304.52 MHz. We use a measurement-device-independent protocol to demonstrate secure key establishment over fibres covering up to 300 km. This study highlights the potential of single-photon sources in quantum relays to enhance information transmission, expand network coverage and improve deployment flexibility, with promising applications in future quantum networks.</p>

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Realization of an untrusted intermediate relay architecture using a quantum dot single-photon source

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Mi Zou,
  • Yu-Ming He,
  • Yizhi Huang,
  • Jun-Yi Zhao,
  • Bin-Chen Li,
  • Yong-Peng Guo,
  • Xing Ding,
  • Mo-Chi Xu,
  • Run-Ze Liu,
  • Geng-Yan Zou,
  • Zhen Ning,
  • Xiang You,
  • Hui Wang,
  • Wen-Xin Pan,
  • Hao-Tao Zhu,
  • Ming-Yang Zheng,
  • Xiu-Ping Xie,
  • Dandan Qin,
  • Xiao Jiang,
  • Yong-Heng Huo,
  • Qiang Zhang,
  • Chao-Yang Lu,
  • Xiongfeng Ma,
  • Teng-Yun Chen,
  • Jian-Wei Pan

摘要

To fully exploit the potential of quantum technologies, quantum networks are needed to link different systems, enhancing applications in computing, cryptography and metrology. Central to these networks are quantum relays that can facilitate long-distance entanglement distribution and quantum communication. In this work, we present a modular and scalable quantum relay architecture using a high-quality single-photon source. The proposed network incorporates three untrusted intermediate nodes and is capable of a repetition rate of 304.52 MHz. We use a measurement-device-independent protocol to demonstrate secure key establishment over fibres covering up to 300 km. This study highlights the potential of single-photon sources in quantum relays to enhance information transmission, expand network coverage and improve deployment flexibility, with promising applications in future quantum networks.