Deployed trusted-node quantum key distribution over 300 km with a multi-core fiber access link
Quantum key distribution (QKD) is increasingly considered for deployment in realistic communication networks, where long distances, heterogeneous fiber infrastructure, and coexistence with classical traffic present substantial challenges. Here, we demonstrate trusted-node QKD between Linköping University and the Stockholm hub of the Swedish national quantum communication infrastructure over 270 km of deployed single-mode fiber, extended by a 33 km multi-core fiber (MCF) segment emulating a metropolitan access link, for a total distance of 303 km. The two sub-links use commercial QKD systems whose receivers are interfaced with external superconducting nanowire single-photon detectors, enab...
| Authors | Martin Clason, Joakim Argillander, Didrik Bergström et al. |
|---|---|
| Primary category | quant-ph |
| Published | 4 June 2026 |
| Last updated at source | 4 June 2026 |
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