A quantum key distribution network in the metropolitan area of Padova

Marco Avesani; Giulio Foletto; Matteo Padovan; Luca Calderaro; Costantino Agnesi; Elisa Bazzani; Federico Berra; Tommaso Bertapelle; Francesco Picciariello; Francesco Santagiustina; Davide Scalcon; Alessia Scriminich; Andrea Stanco; Francesco Vedovato; Giuseppe Vallone; Paolo Villoresi

doi:10.1117/12.2649400

8 March 2023 A quantum key distribution network in the metropolitan area of Padova

Marco Avesani, Giulio Foletto, Matteo Padovan, Luca Calderaro, Costantino Agnesi, Elisa Bazzani, Federico Berra, Tommaso Bertapelle, Francesco Picciariello, Francesco Santagiustina, Davide Scalcon, Alessia Scriminich, Andrea Stanco, Francesco Vedovato, Giuseppe Vallone, Paolo Villoresi

Author Affiliations +

Proceedings Volume 12446, Quantum Computing, Communication, and Simulation III; 124460J (2023) https://doi.org/10.1117/12.2649400
Event: SPIE Quantum West, 2023, San Francisco, California, United States

Abstract

One of the most advanced technologies within the field of quantum mechanics is quantum key distribution (QKD), which allows the secure generation of secret keys among remote users. In order for QKD to be more widely adopted, it must be integrated into existing classical communication systems. However, this can be difficult due to the use of various technologies and channels in deployed networks. Recently, we developed a QKD network in the metropolitan area of Padova, which connects various nodes across the city through a combination of fiber and free-space links. By utilizing a modular design based on the iPOGNAC encoder and the Qubit4Sync method, we have realized portable and adaptable systems that operate in the C and O bands. This allowed us to deploy and test the compatibility of both research and commercial QKD systems by ThinkQuantum with classical communication over a variety of links, as well as their ability to switch between free-space and fiber connections. Finally, we developed and experimentally implemented complex network configurations such as star networks, where a fiber-based transmitter and free-space transmitter could operate with a single receiver.

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Marco Avesani, Giulio Foletto, Matteo Padovan, Luca Calderaro, Costantino Agnesi, Elisa Bazzani, Federico Berra, Tommaso Bertapelle, Francesco Picciariello, Francesco Santagiustina, Davide Scalcon, Alessia Scriminich, Andrea Stanco, Francesco Vedovato, Giuseppe Vallone, and Paolo Villoresi "A quantum key distribution network in the metropolitan area of Padova", Proc. SPIE 12446, Quantum Computing, Communication, and Simulation III, 124460J (8 March 2023); https://doi.org/10.1117/12.2649400

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