Coherent phase transfer for real-world twin-field quantum key distribution (Conference Presentation)

Salvatore Virzì; Cecilia Clivati; Alice Meda; Simone Donadello; Marco Genovese; Filippo Levi; Alberto Mura; Ivo Degiovanni; Davide Calonico

doi:10.1117/12.2646325

3 October 2022 Coherent phase transfer for real-world twin-field quantum key distribution (Conference Presentation)

Salvatore Virzì, Cecilia Clivati, Alice Meda, Simone Donadello, Marco Genovese, Filippo Levi, Alberto Mura, Ivo Degiovanni, Davide Calonico

Author Affiliations +

Proceedings Volume PC12238, Quantum Communications and Quantum Imaging XX; PC122380H (2022) https://doi.org/10.1117/12.2646325
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

Nowadays, a technological challenge is to integrate quantum key distribution (QKD) protocols in already present telecommunication fiber networks. Twin-field QKD is one of the most promising techniques on long distances, but requires stabilizing the optical length of the communication channels between parties. Adapting interferometry techniques derived from frequency metrology, we developed a solution for the simultaneous key sharing and channel length control, and we demonstrated it on a 206 km field-deployed fiber with 65 dB loss. Our method reduces the quantum-bit-error-rate contributed by channel length variations to <1%, representing an effective solution for real-world quantum communications.

Conference Presentation

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Salvatore Virzì, Cecilia Clivati, Alice Meda, Simone Donadello, Marco Genovese, Filippo Levi, Alberto Mura, Ivo Degiovanni, and Davide Calonico "Coherent phase transfer for real-world twin-field quantum key distribution (Conference Presentation)", Proc. SPIE PC12238, Quantum Communications and Quantum Imaging XX, PC122380H (3 October 2022); https://doi.org/10.1117/12.2646325

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KEYWORDS

Quantum key distribution

Fiber lasers

Networks

Laser development

Laser metrology

Metrology

Network security

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