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

Cecilia Clivati (), Alice Meda, Simone Donadello, Salvatore Virzì, Marco Genovese, Filippo Levi, Alberto Mura, Mirko Pittaluga, Zhiliang Yuan, Andrew J. Shields, Marco Lucamarini, Ivo Pietro Degiovanni and Davide Calonico
Additional contact information
Cecilia Clivati: INRIM
Alice Meda: INRIM
Simone Donadello: INRIM
Salvatore Virzì: INRIM
Marco Genovese: INRIM
Filippo Levi: INRIM
Alberto Mura: INRIM
Mirko Pittaluga: Toshiba Europe Ltd
Zhiliang Yuan: Beijing Academy of Quantum Information Sciences
Andrew J. Shields: Toshiba Europe Ltd
Marco Lucamarini: University of York
Ivo Pietro Degiovanni: INRIM
Davide Calonico: INRIM

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract 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

Date: 2022
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DOI: 10.1038/s41467-021-27808-1

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