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Entanglement of two quantum memories via fibres over dozens of kilometres

Author

Listed:
  • Yong Yu

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

  • Fei Ma

    (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)

  • Xi-Yu Luo

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

  • Bo Jing

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

  • Peng-Fei Sun

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

  • Ren-Zhou Fang

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

  • Chao-Wei Yang

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

  • Hui Liu

    (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)

  • Xiu-Ping Xie

    (Jinan Institute of Quantum Technology)

  • Wei-Jun Zhang

    (Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences)

  • Li-Xing You

    (Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences)

  • Zhen Wang

    (Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences)

  • Teng-Yun Chen

    (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

A quantum internet that connects remote quantum processors1,2 should enable a number of revolutionary applications such as distributed quantum computing. Its realization will rely on entanglement of remote quantum memories over long distances. Despite enormous progress3–12, at present the maximal physical separation achieved between two nodes is 1.3 kilometres10, and challenges for longer distances remain. Here we demonstrate entanglement of two atomic ensembles in one laboratory via photon transmission through city-scale optical fibres. The atomic ensembles function as quantum memories that store quantum states. We use cavity enhancement to efficiently create atom–photon entanglement13–15 and we use quantum frequency conversion16 to shift the atomic wavelength to telecommunications wavelengths. We realize entanglement over 22 kilometres of field-deployed fibres via two-photon interference17,18 and entanglement over 50 kilometres of coiled fibres via single-photon interference19. Our experiment could be extended to nodes physically separated by similar distances, which would thus form a functional segment of the atomic quantum network, paving the way towards establishing atomic entanglement over many nodes and over much longer distances.

Suggested Citation

  • Yong Yu & Fei Ma & Xi-Yu Luo & Bo Jing & Peng-Fei Sun & Ren-Zhou Fang & Chao-Wei Yang & Hui Liu & Ming-Yang Zheng & Xiu-Ping Xie & Wei-Jun Zhang & Li-Xing You & Zhen Wang & Teng-Yun Chen & Qiang Zhang, 2020. "Entanglement of two quantum memories via fibres over dozens of kilometres," Nature, Nature, vol. 578(7794), pages 240-245, February.
    • Handle: RePEc:nat:nature:v:578:y:2020:i:7794:d:10.1038_s41586-020-1976-7
    DOI: 10.1038/s41586-020-1976-7
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    Citations

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    Cited by:

    1. Ning-Ning Wang & Alejandro Pozas-Kerstjens & Chao Zhang & Bi-Heng Liu & Yun-Feng Huang & Chuan-Feng Li & Guang-Can Guo & Nicolas Gisin & Armin Tavakoli, 2023. "Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Ming-Hao Jiang & Wenyi Xue & Qian He & Yu-Yang An & Xiaodong Zheng & Wen-Jie Xu & Yu-Bo Xie & Yanqing Lu & Shining Zhu & Xiao-Song Ma, 2023. "Quantum storage of entangled photons at telecom wavelengths in a crystal," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    3. Hanfeng Wang & Matthew E. Trusheim & Laura Kim & Hamza Raniwala & Dirk R. Englund, 2023. "Field programmable spin arrays for scalable quantum repeaters," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    4. Robert Stockill & Moritz Forsch & Frederick Hijazi & Grégoire Beaudoin & Konstantinos Pantzas & Isabelle Sagnes & Rémy Braive & Simon Gröblacher, 2022. "Ultra-low-noise microwave to optics conversion in gallium phosphide," Nature Communications, Nature, vol. 13(1), pages 1-12, December.

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