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This breakthrough demonstrates a significant scaling of quantum memory capacity, moving from 8000 to over 16,000 temporal modes while maintaining coherence for up to 63 microseconds across metropolitan fiber networks. By utilizing rare-earth-ion ensembles with high bandwidth, the research effectively multiplies communication "lanes" for photons, which is a critical step toward building practical, high-throughput quantum internet infrastructure.

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Researchers Store Entanglement across 8000 Modes in Geneva Fibre

Quantum ZeitgeistAugust 18, 20264 min read

Entanglement has now been stored across 16340 temporal modes and distributed via a metropolitan fibre network. This achievement surpasses previous methods for multiplexing and distribution, enabling a substantial increase in potential communication rates. The demonstration of entanglement storage for up to 63s over 5.

Angelo Gelmini Rodriguez of the University of Geneva and colleagues from alto University and PSL University have stored entanglement across 16340 temporal modes, a sharp increase over previous methods. Entanglement was distributed over 5.66km of metropolitan fibre, utilising a quantum memory with a 250MHz bandwidth and storing photons for up to 63 microseconds, sharply extending the possibilities for long-distance quantum communication. The team demonstrated the storage of entanglement across 16340 temporal modes,…

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