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Optical Fiber Communication Conference

Deployed QKD Networks in Europe

Hannes Hübel, Florian Kutschera, Christoph Pacher, Martin Achleitner, Werner Strasser, Francesco Vedovato, Edoardo Rossi, Francesco Picciariello, Giuseppe Vallone, Paolo Villoresi, Luca Calderaro, Vicente Martín, Juan P. Brito, Laura Ortíz, Diego R. Lopez, Antonio Pastor‐Perales, Marc Geitz, Ralf-Peter Braun, Piotr Rydlichowski

Published Jan 1, 2023• 14 citations
Publisher

Abstract

We report several use-case demonstrations for quantum key distribution in deployed fiber networks. The tests were carried out under real world conditions at the end-user premises using commercial QKD systems.
DOI
10.1364/ofc.2023.w4k.1

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In-field demonstrations in real-world scenarios boost the development of quantum key distribution (QKD) towards its integration in existing infrastructures. Although QKD devices are already adopted outside the laboratories, current field implementations still suffer from high costs and low performances, preventing this technology from a large-scale deployment in telecommunication networks. Here, we present the developing of a cost-effective setup for QKD field trials, implemented for testing QKD performances in two different scenarios: (i) using an installed fiber link the metropolitan area of Florence (Italy); (ii) using a submarine optical fiber channel between Malta and Sicily.
The performances of Quantum Key Distribution (QKD) systems have notably progressed since the early experimental demonstrations and several recent works indicate that the pace of this progression is very likely to be maintained -if not increased- in the future years. In parallel to this fast progression of QKD techniques, commercial products are also being developed, making QKD deployment for securization of some specific “real” data networks more and more likely to occur. It is the goal to the European project Secoqc to deploy a secure long-distance network based on quantum cryptography. It implies the conception of a specific architecture able to connect multiple users that may possibly be very far away from each other while QKD links are currently ″point-to-point only″and intrinsically limited in distance.