Deployment-ready quantum key distribution over a classical network infrastructure in Padua
Marco Avesani, Giulio Foletto, Matteo Padovan, Luca Calderaro,, Costantino Agnesi, Elisa Bazzani, Federico Berra, Tommaso Bertapelle,, Francesco Picciariello, Francesco B.L. Santagiustina, Davide Scalcon, Alessia, Scriminich, Andrea Stanco, Francesco Vedovato, Giuseppe Vallone

TL;DR
This paper demonstrates a practical, cost-effective quantum key distribution system integrated with classical fiber networks, enabling secure communication over existing infrastructure with minimal additional hardware.
Contribution
It introduces a deployment-ready QKD implementation over classical fiber infrastructure using a single fiber and a simplified receiver scheme, facilitating real-world adoption.
Findings
Successful QKD over classical fiber infrastructure
Single-photon detector used for both quantum and classical channels
Compatible with standard telecommunication infrastructure
Abstract
Current technological progress is driving Quantum Key Distribution towards a commercial and world widescale expansion. Its capability to deliver unconditionally secure communication will be a fundamental feature in the next generations of telecommunication networks. Nevertheless, demonstrations of QKD implementation in a real operating scenario and their coexistence with the classical telecom infrastructure are of fundamental importance for reliable exploitation. Here we present a Quantum Key Distribution application implemented overa classical fiber-based infrastructure. By exploiting just a single fiber cable for both the quantum and the classical channel and by using a simplified receiver scheme with just one single-photon detector, we demonstrate the feasibility of low-cost and ready-to-use Quantum Key Distribution systems compatible with standard classical infrastructure.
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