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Continuous entanglement distribution over a transnational 248 km fiber link

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  • Sebastian Philipp Neumann

    (Institute for Quantum Optics and Quantum Information Vienna
    Vienna Center for Quantum Science and Technology)

  • Alexander Buchner

    (Institute for Quantum Optics and Quantum Information Vienna
    Vienna Center for Quantum Science and Technology)

  • Lukas Bulla

    (Institute for Quantum Optics and Quantum Information Vienna
    Vienna Center for Quantum Science and Technology)

  • Martin Bohmann

    (Institute for Quantum Optics and Quantum Information Vienna
    Vienna Center for Quantum Science and Technology)

  • Rupert Ursin

    (Institute for Quantum Optics and Quantum Information Vienna
    Vienna Center for Quantum Science and Technology)

Abstract

Reliable long-distance distribution of entanglement is a key technique for many quantum applications, most notably quantum key distribution. Here, we present a continuously working, trusted-node free international link between Austria and Slovakia, directly distributing polarization-entangled photon pairs via 248 km of deployed telecommunication fiber. Despite 79 dB loss, we observe stable detected pair rates of 9 s−1 over 110 h. We mitigate multi-pair detections with strict temporal filtering, enabled by nonlocal compensation of chromatic dispersion and superconducting nanowire detectors. Fully automatized active polarization stabilization keeps the entangled state’s visibility at 86% for altogether 82 h. In a quantum cryptography context, this corresponds to an asymptotic secure key rate of 1.4 bits/s and 258 kbit of total key, considering finite-key effects. Our work paves the way for low-maintenance, ultra-stable quantum communication over long distances, independent of weather conditions and time of day, thus constituting an important step towards the quantum internet.

Suggested Citation

  • Sebastian Philipp Neumann & Alexander Buchner & Lukas Bulla & Martin Bohmann & Rupert Ursin, 2022. "Continuous entanglement distribution over a transnational 248 km fiber link," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33919-0
    DOI: 10.1038/s41467-022-33919-0
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    References listed on IDEAS

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