Versatile Wavelength-Division Multiplexed Quantum Key Distribution Network Operating Simultaneously in the O and C Bands
Davide Scalcon, Matteo Padovan, Paolo Villoresi, Giuseppe Vallone, Marco Avesani

TL;DR
This paper demonstrates a four-node quantum key distribution network using wavelength-division multiplexing in the O and C bands, enabling simultaneous secure key sharing with reduced costs and increased system compactness.
Contribution
It introduces a versatile, cost-effective WDM-based QKD network operating in multiple bands with shared components, enhancing scalability and practicality.
Findings
Successful simultaneous key distribution in O and C bands
Reduced system costs through shared decoding components
Enhanced network compactness and scalability
Abstract
Ongoing technological progress is accelerating the commercial and global-scale deployment of Quantum Key Distribution (QKD). Its ability to enable unconditionally secure communication is expected to be a key feature of future telecommunication networks, and practical demonstrations of QKD network implementations in real-world environments are crucial for ensuring reliable adoption. In this work, we demonstrate a four-node photonic QKD network that employs versatile and cost-effective wavelength-division multiplexing across three transmitters in the O and C bands to simultaneously distribute quantum-secure keys among all nodes. Specifically, the broadband central receiver node shares all optical and electronic decoding components, except for the single-photon detectors, across the three QKD links, significantly reducing system costs and enhancing compactness.
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Taxonomy
TopicsOptical Network Technologies · Quantum Information and Cryptography · Advanced Photonic Communication Systems
