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11 June 2024 Twin-field QKD in a real-world network
Alice Meda, Salvatore Virzì, Cecilia Clivati, Carlo Liorni, Gianluca Bertaina, Simone Donadello, Marco Gramegna, Ivo Pietro Degiovanni, Mirko Pittaluga, Marco Lucamarini, Zhilian Yuan, Andrew Shields, Massimiliano Dispenza, Marco Genovese, Davide Calonico
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Proceedings Volume PC12993, Quantum Technologies 2024; PC1299309 (2024) https://doi.org/10.1117/12.3022210
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
Quantum Key Distribution (QKD) is a technology that allows sharing secret cryptographic keys between two distant users (Alice and Bob), whose intrinsic security is guaranteed by fundamental principles of quantum mechanics. QKD is a mature technology even if one of the main remaining challenges is the integration of different solutions in already deployed telecommunication fiber networks, in particular in long-haul segments. An approach able to cover long distances is the Twin-field QKD (TF-QKD) protocol; TF-QKD exploits interference of optical pulses in a central untrusted node (Charlie), allowing to double the communication distance with respect to the conventional prepare-and-measure solutions. Here we present a solution to one of the main issues of Twin-Field QKD, the phase stabilization within the optical path, demonstrating a strong advantage in performances of real word TF- QKD and testing our solution in a segment of the Italian Quantum Backbone. Furthermore, we analyze in detail the expected gain in terms of key rate exploiting our stabilization technique in the main TF-QKD-based protocols, even when they are declared insensitive to the phase noise.
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Alice Meda, Salvatore Virzì, Cecilia Clivati, Carlo Liorni, Gianluca Bertaina, Simone Donadello, Marco Gramegna, Ivo Pietro Degiovanni, Mirko Pittaluga, Marco Lucamarini, Zhilian Yuan, Andrew Shields, Massimiliano Dispenza, Marco Genovese, and Davide Calonico "Twin-field QKD in a real-world network", Proc. SPIE PC12993, Quantum Technologies 2024, PC1299309 (11 June 2024); https://doi.org/10.1117/12.3022210
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KEYWORDS
Quantum key distribution
Quantum networks
Quantum communications
Quantum communication protocols
Quantum technologies
Telecommunication networks
Quantum noise
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