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Researchers at the University of Bristol have demonstrated a metropolitan-scale quantum network that dynamically reconfigures entanglement links between six users using a q-ROADM device. This breakthrough moves beyond static architectures by actively managing topology and supporting multiple protocols over existing fiber infrastructure, proving long-term stability for over 150 hours. The work validates a critical path toward scalable, service-oriented quantum networking without requiring new dedicated cables.
University of Bristol Builds Dynamic Entanglement Network
Dynamic entanglement distribution is a key requirement for scalable, multi-user and multi-protocol quantum networks. Researchers demonstrate a metropolitan-scale entanglement-based quantum communication network, dynamically distributing polarisation-entangled photon pairs to six users over deployed campus and metropolitan fibre.
Researchers from the University of Bristol, the Ruder Bošković Institute, and the Slovak Academy of Sciences have built a quantum network capable of dynamically reconfiguring entanglement links between multiple users. The system, detailed in published research, demonstrates entanglement across a metropolitan-scale fiber network, connecting six users and supporting flexible network configurations. This demonstration utilizes a quantum reconfigurable optical add-drop multiplexer, or q-ROADM, to distribute polarization-entangled photon pairs, moving beyond static quantum networks toward scalable, multi-user applications. The network maintained stable six-user operation for over 150 hours and also supports different quantum protocols, showcasing a path toward service-oriented quantum networking over existing optical infrastructure.…
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