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Coherent phase transfer for real-world twin-field quantum key distribution

Nature communications, 2022-01, Vol.13 (1), p.157-157, Article 157 [Peer Reviewed Journal]

2022. The Author(s). ;The Author(s) 2022. corrected publication 2022. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;The Author(s) 2022, corrected publication 2022 ;ISSN: 2041-1723 ;EISSN: 2041-1723 ;DOI: 10.1038/s41467-021-27808-1 ;PMID: 35013290

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  • Title:
    Coherent phase transfer for real-world twin-field quantum key distribution
  • Author: Clivati, Cecilia ; Meda, Alice ; Donadello, Simone ; Virzì, Salvatore ; Genovese, Marco ; Levi, Filippo ; Mura, Alberto ; Pittaluga, Mirko ; Yuan, Zhiliang ; Shields, Andrew J ; Lucamarini, Marco ; Degiovanni, Ivo Pietro ; Calonico, Davide
  • Subjects: Clocks ; Communication ; Experiments ; Interferometry ; Lasers ; Net losses ; Noise ; Quantum cryptography ; Quantum mechanics ; Streaming
  • Is Part Of: Nature communications, 2022-01, Vol.13 (1), p.157-157, Article 157
  • Description: Quantum mechanics allows distribution of intrinsically secure encryption keys by optical means. Twin-field quantum key distribution is one of the most promising techniques for its implementation on long-distance fiber networks, but requires stabilizing the optical length of the communication channels between parties. In proof-of-principle experiments based on spooled fibers, this was achieved by interleaving the quantum communication with periodical stabilization frames. In this approach, longer duty cycles for the key streaming come at the cost of a looser control of channel length, and a successful key-transfer using this technique in real world remains a significant challenge. Using interferometry techniques derived from frequency metrology, we develop a solution for the simultaneous key streaming and channel length control, and demonstrate it on a 206 km field-deployed fiber with 65 dB loss. Our technique reduces the quantum-bit-error-rate contributed by channel length variations to <1%, representing an effective solution for real-world quantum communications.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2041-1723
    EISSN: 2041-1723
    DOI: 10.1038/s41467-021-27808-1
    PMID: 35013290
  • Source: PubMed Central
    ProQuest Central
    DOAJ Directory of Open Access Journals
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