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Quantum 2.0 Conference and Exhibition

Atomic Clocks Technologies Supporting Twin-Field QKD in a Real World

Simone Donadello, Cecilia Clivati, Alice Meda, Salvatore Virzì, Marco Genovese, Filippo Levi, Alberto Mura, Mirko Pittaluga, Zhiliang L. Yuan, A. J. Shields, Marco Lucamarini, Ivo Pietro Degiovanni, Davide Calonico

Published Jan 1, 2022• 1 citation
Publisher

Abstract

We describe the exploitation of narrow linewidth lasers and coherent laser interferometry techniques originally developed in the atomic clocks community to improve the performances of twin-field quantum key distribution protocols in real-world, long-distance fiber networks.
DOI
10.1364/quantum.2022.qtu4c.3

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Continuing efforts have been made to develop practical quantum key distribution (QKD) systems on the installed fiber networks since early 2000s [1]. Recently, several groups have demonstrated high-speed QKD systems [2,3] with GHz-clock frequency working stably on the installed-fiber networks [4-7]. Along with the hardware development, an efficient key management protocol [7] has been implemented to construct a QKD platform to supply information-theoretically secure key for multiple applications. The highly available QKD platform is expected to promote social deployment of the QKD technology.
The integration of Quantum Key Distribution (QKD) protocols in metropolitan networks, exploiting already deployed telecommunication fibers, requires particular attention due to the non-ideal environment in which the protocol operates. At present, Twin-field QKD is one of the most promising techniques to reach the extension of QKD transmission but its real-word exploitation requires that the communication channel is stable in terms of optical length and is free from background light that increase the errors in the transmitted keys. Adapting interferometry techniques derived from frequency metrology, we recently proposed a solution [1] for a tight channel length control, and demonstrated it on a 206 km metropolitan fiber with 65 dB loss. Here we analyze in details the effects of background photons and the solutions that we applied to reduce their contribution to a negligible level.