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<p>Spectrally multiplexed quantum elementary link is an important building block for quantum networks. Towards long distance quantum communication, such multiplexed elementary links should be connected via the Bell state measurement (BSM). In this work, we propose and demonstrate a scheme for connecting two adjacent elementary links with frequency shifting. In our proof-of-principle demonstration, each elementary link has two spectral channels with a channel spacing of 16 GHz, and the photonic quantum information is encoded in the temporal mode. A projection fidelity of BSM reaches &gt;95% between different spectral channels with decoy-state analysis. We also evaluate the performance of our demonstration by calculating the secret key rate of spectrally multiplexed measurement-device-independent quantum key distribution. Our results could pave the way for developing long distance quantum networks.</p>

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Bridging quantum elementary links with spectral steering

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Ruiming Zhang,
  • Yunru Fan,
  • Chenzhi Yuan,
  • Hao Yu,
  • Hao Li,
  • You Wang,
  • Guangwei Deng,
  • Haizhi Song,
  • Lixing You,
  • Guangcan Guo,
  • Qiang Zhou

摘要

Spectrally multiplexed quantum elementary link is an important building block for quantum networks. Towards long distance quantum communication, such multiplexed elementary links should be connected via the Bell state measurement (BSM). In this work, we propose and demonstrate a scheme for connecting two adjacent elementary links with frequency shifting. In our proof-of-principle demonstration, each elementary link has two spectral channels with a channel spacing of 16 GHz, and the photonic quantum information is encoded in the temporal mode. A projection fidelity of BSM reaches >95% between different spectral channels with decoy-state analysis. We also evaluate the performance of our demonstration by calculating the secret key rate of spectrally multiplexed measurement-device-independent quantum key distribution. Our results could pave the way for developing long distance quantum networks.