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France has successfully transitioned quantum communication from laboratory experiments to practical deployment, establishing a 100-kilometer network with over 325 hours of continuous operation. The study provides critical benchmarks for scaling quantum networks by validating broadband source suitability and optimizing the Cascade protocol against transmission losses. This milestone confirms the viability of real-world quantum infrastructure for secure long-distance data exchange.
France deploys a quantum key distribution network
Researchers in France have deployed a quantum key distribution network, expanding reach and user capacity.
The network currently supports ten users, demonstrating a move beyond laboratory experiments toward practical, long-duration quantum communication. The work, detailed in a paper published September 29, 2026, reports continuous operation of a secure link for over 325 hours across 50 kilometers, and extends key distribution to a 100 kilometer link connecting university campuses. The design choice streamlines infrastructure while preserving key rate performance. Results indicate a wide portion of the spectrum is usable, confirming the broadband source’s suitability for real-world quantum network implementations, though key generation dips near wavelengths of 1561 nanometers and 1581/1541 nanometers. The network’s architecture incorporates three fiber segments measuring 19. 2 kilometers, 32. 7 kilometers, and 48. 2 kilometers, respectively. They further extend secure key distribution up to a 100 km operational link connecting several campuses of the University Côte d’Azur to an optical ground station. This configuration allowed for testing of long-distance entanglement distribution and key generation under realistic…
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