Noise-robust O-band quantum key distribution at 1295.56 nm for coexistence in WDM networks

Article Article scientifique Article Noise-robust O-band quantum key distribution at 1295.56 nm for coexistence in WDM networks eng 2026-06-19 2026-09-01 author Núñez Bon Javier 0009-0004-3141-1600 430789 author Boaron Alberto 0000-0002-0835-9785 author Stucki Damien author Korzh Boris 0000-0002-8262-9720 782725 Serv com physique appliquée (FIGCO) author Thew Rob 0000-0003-0188-6053 541344 Serv com physique appliquée (FIGCO) author Boso Gianluca 0009-0007-0578-5790 035013 10.1088/2058-9565/ae7826 2058-9565 https://iopscience.iop.org/article/10.1088/2058-9565/ae7826 Integrating quantum key distribution (QKD) into optical networks is a crucial step toward the adoption of quantum technologies in existing telecommunication fiber infrastructures. However, state-of-the-art solutions face significant challenges, including sensitivity to classical noise, particularly spontaneous Raman scattering, limited transmission distances, and varying network conditions. In this work, we present a novel discrete-variable QKD system running a time-bin BB84 protocol operating in the O-band (1295.56 nm), where the impact of dominant noise sources is effectively reduced. Combined with passive narrow-spectral filtering at the receiver, our system demonstrates robustness across diverse dense wavelength-division multiplexing scenarios, making it practical for real-world deployments. We validate its performance through extensive testing, showing stable key generation coexisting with different classical traffic conditions up to 17 dBm of total launch power. These results represent a significant advancement toward the integration of QKD into existing fiber networks, paving the way for secure quantum communication on a large scale. Dewey 500.2 European Commission Agile uLtra Low EnerGy secuRe netwOrks 101092766 ALLEGRO EU HE 35 Groupe de physique appliquée 135 false 1404 Groupe Thew 1455 Groupe Korzh Quantum science and technology 11 3 ec1b259f-c59e-4f24-a307-01f191c58d2f Article (Published version) Public file.pdf 1313732 application/pdf CC BY-4.0 45fb62b2f96d8b79ae1528125086bdb37ac003ea457b3de58d505505d7559ddd openAccess Faculté des sciences / Section de physique / Groupe de physique appliquée

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Noise-robust O-band quantum key distribution at 1295.56 nm for coexistence in WDM networks	Quantum science and technology			2026	16	37

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Núñez Bon, Javier

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