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Creation of memory–memory entanglement in a metropolitan quantum network

Author

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  • Jian-Long Liu

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Xi-Yu Luo

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Yong Yu

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China
    Delft University of Technology)

  • Chao-Yang Wang

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Bin Wang

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Yi Hu

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Jun Li

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Ming-Yang Zheng

    (Jinan Institute of Quantum Technology)

  • Bo Yao

    (Chinese Academy of Science
    Advanced Laser Technology Laboratory of Anhui Province)

  • Zi Yan

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Da Teng

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Jin-Wei Jiang

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Xiao-Bing Liu

    (Chinese Academy of Science
    Advanced Laser Technology Laboratory of Anhui Province)

  • Xiu-Ping Xie

    (Jinan Institute of Quantum Technology)

  • Jun Zhang

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Qing-He Mao

    (Chinese Academy of Science
    Advanced Laser Technology Laboratory of Anhui Province
    University of Science and Technology of China)

  • Xiao Jiang

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Qiang Zhang

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China
    Jinan Institute of Quantum Technology)

  • Xiao-Hui Bao

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

  • Jian-Wei Pan

    (University of Science and Technology of China
    University of Science and Technology of China
    University of Science and Technology of China)

Abstract

Towards realizing the future quantum internet1,2, a pivotal milestone entails the transition from two-node proof-of-principle experiments conducted in laboratories to comprehensive multi-node set-ups on large scales. Here we report the creation of memory–memory entanglement in a multi-node quantum network over a metropolitan area. We use three independent memory nodes, each of which is equipped with an atomic ensemble quantum memory3 that has telecom conversion, together with a photonic server where detection of a single photon heralds the success of entanglement generation. The memory nodes are maximally separated apart for 12.5 kilometres. We actively stabilize the phase variance owing to fibre links and control lasers. We demonstrate concurrent entanglement generation between any two memory nodes. The memory lifetime is longer than the round-trip communication time. Our work provides a metropolitan-scale testbed for the evaluation and exploration of multi-node quantum network protocols and starts a stage of quantum internet research.

Suggested Citation

  • Jian-Long Liu & Xi-Yu Luo & Yong Yu & Chao-Yang Wang & Bin Wang & Yi Hu & Jun Li & Ming-Yang Zheng & Bo Yao & Zi Yan & Da Teng & Jin-Wei Jiang & Xiao-Bing Liu & Xiu-Ping Xie & Jun Zhang & Qing-He Mao , 2024. "Creation of memory–memory entanglement in a metropolitan quantum network," Nature, Nature, vol. 629(8012), pages 579-585, May.
    • Handle: RePEc:nat:nature:v:629:y:2024:i:8012:d:10.1038_s41586-024-07308-0
    DOI: 10.1038/s41586-024-07308-0
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