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Single-emitter quantum key distribution over 175 km of fibre with optimised finite key rates

Author

Listed:
  • Christopher L. Morrison

    (Heriot-Watt University)

  • Roberto G. Pousa

    (University of Strathclyde)

  • Francesco Graffitti

    (Heriot-Watt University)

  • Zhe Xian Koong

    (Heriot-Watt University)

  • Peter Barrow

    (Heriot-Watt University)

  • Nick G. Stoltz

    (University of California)

  • Dirk Bouwmeester

    (Leiden University
    University of California)

  • John Jeffers

    (University of Strathclyde)

  • Daniel K. L. Oi

    (University of Strathclyde)

  • Brian D. Gerardot

    (Heriot-Watt University)

  • Alessandro Fedrizzi

    (Heriot-Watt University)

Abstract

Quantum key distribution with solid-state single-photon emitters is gaining traction due to their rapidly improving performance and compatibility with future quantum networks. Here we emulate a quantum key distribution scheme with quantum-dot-generated single photons frequency-converted to 1550 nm, achieving count rates of 1.6 MHz with $${g}^{\left(2\right)}\left(0\right)=3.6\%$$ g 2 0 = 3.6 % and asymptotic positive key rates over 175 km of telecom fibre. We show that the commonly used finite-key analysis for non-decoy state QKD drastically overestimates secure key acquisition times due to overly loose bounds on statistical fluctuations. Using the tighter multiplicative Chernoff bound to constrain the estimated finite key parameters, we reduce the required number of received signals by a factor 108. The resulting finite key rate approaches the asymptotic limit at all achievable distances in acquisition times of one hour, and at 100 km we generate finite keys at 13 kbps for one minute of acquisition. This result is an important step towards long-distance single-emitter quantum networking.

Suggested Citation

  • Christopher L. Morrison & Roberto G. Pousa & Francesco Graffitti & Zhe Xian Koong & Peter Barrow & Nick G. Stoltz & Dirk Bouwmeester & John Jeffers & Daniel K. L. Oi & Brian D. Gerardot & Alessandro F, 2023. "Single-emitter quantum key distribution over 175 km of fibre with optimised finite key rates," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39219-5
    DOI: 10.1038/s41467-023-39219-5
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    References listed on IDEAS

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    1. Edo Waks & Kyo Inoue & Charles Santori & David Fattal & Jelena Vuckovic & Glenn S. Solomon & Yoshihisa Yamamoto, 2002. "Quantum cryptography with a photon turnstile," Nature, Nature, vol. 420(6917), pages 762-762, December.
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