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This 303km trusted-node QKD demonstration proves that quantum key distribution can coexist with classical Ethernet traffic on deployed fibre, marking a critical step toward hybrid quantum-classical networks. While the record distance expands metropolitan reach, the study also highlights practical constraints regarding throughput for data-heavy applications like image encryption. The successful integration of dynamic switching in a real-world environment signals that quantum networks are moving beyond isolated lab experiments into complex, operational infrastructure.

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Secure Quantum Communication Reaches 303 Kilometres across Real Networks

Quantum ZeitgeistJune 9, 20265 min read

Can quantum-secure communication coexist with existing data traffic on the same fibre optic cable, and still operate over long distances. Trusted-node quantum key distribution has now been demonstrated over 303km of deployed fibre, integrating QKD with a dynamically reconfigurable network including active switching between multi-core fibre cores. This deployment showcases a practical step towards hybrid quantum-classical networks, moving beyond laboratory demonstrations.

A new quantum key distribution (QKD) system operates over a deployed 303km fibre link, addressing the key need for secure communication networks capable of operating over long distances and integrating with existing infrastructure. Martin Clason and colleagues at Linköping University, in collaboration with KTH Royal Institute of Technology, Stockholm University, and Chalmers University of Technology, have combined single-mode fibre with a 33km multicore fibre segment. The system successfully integrates commercial QKD systems with external detectors to overcome limitations in standard technology. This research demonstrates that operating QKD alongside classical Ethernet traffic and…

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