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Fast delivery of heralded atom-photon quantum correlation over 12 km fiber through multiplexing enhancement

Author

Listed:
  • Sheng Zhang

    (Tsinghua University)

  • Jixuan Shi

    (Tsinghua University)

  • Yibo Liang

    (Tsinghua University)

  • Yuedong Sun

    (Tsinghua University)

  • Yukai Wu

    (Tsinghua University
    Hefei National Laboratory)

  • Luming Duan

    (Tsinghua University
    Hefei National Laboratory)

  • Yunfei Pu

    (Tsinghua University
    Hefei National Laboratory)

Abstract

Distributing quantum entanglement between distant parties is a significant but difficult task in quantum information science, as it can enable numerous applications but suffers from exponential decay in the quantum channel. Quantum repeaters are one of the most promising approaches towards this goal. In a quantum repeater protocol, it is essential that the entanglement generation speed within each elementary link is faster than the memory decoherence rate, and this stringent requirement has not been implemented over a fiber of metropolitan scale so far. As a step towards this challenging goal, in this work we experimentally realize multiplexing-enhanced generation of heralded atom-photon quantum correlation over a 12 km fiber. We successively generate 280 pairs of atom-photon quantum correlations with a train of photonic time-bin pulses filling the long fiber, and read out the excited memory modes on demand with either fixed or variable storage time after successful heralding. With the multiplexing enhancement, the heralding rate of atom-photon correlation can reach 1.95 kHz, and the ratio between the quantum correlation generation rate to memory decoherence rate can be improved to 0.46 for a fiber length of 12 km. This work therefore constitutes an important step towards the realization of a large-scale quantum repeater network.

Suggested Citation

  • Sheng Zhang & Jixuan Shi & Yibo Liang & Yuedong Sun & Yukai Wu & Luming Duan & Yunfei Pu, 2024. "Fast delivery of heralded atom-photon quantum correlation over 12 km fiber through multiplexing enhancement," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-54691-3
    DOI: 10.1038/s41467-024-54691-3
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