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Entanglement distribution and quantum storage of more than 8000 modes over a metropolitan network

量子物理 2026-08-13 v1
作者: Angelo Gelmini Rodriguez , Louis Nicolas , Théo Sanchez Mejia , Pavel Sekatski , Nicolas Brunner , Towsif Taher , Rob Thew , Philippe Goldner , Mikael Afzelius
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摘要

Entanglement generation between telecommunication photons and matter is central to fibre-based quantum repeaters. Achieving practical communication rates requires multiplexing, which multimode quantum memories can provide. Rare-earth-ion ensembles offer large temporal multimode storage by exploiting the numerous spectral channels within their absorption spectrum. Here, we report on a quantum repeater node comprised of a 171^{171}Yb3+^{3+}:Y2_2SiO5_5 multimode quantum memory, featuring a 250 MHz bandwidth and a 76.6 μs76.6~\mu\mathrm{s} lifetime, and a bandwidth-matched entangled photon-pair source. We introduce and validate a quantitative measure of the effective temporal mode capacity using a Schmidt decomposition. With this platform, we demonstrate entanglement between a telecom photon propagating through a 25.3 km fiber spool and a 979 nm photon stored for 125 μs125~\mu\mathrm{s} across 16340 temporal modes. Finally, we report a field deployment distributing entanglement over 5.66 km through the Geneva metropolitan fibre network while storing 8235 modes for 63 μs63~\mu\mathrm{s}.

引用

@article{arxiv.2608.13177,
  title  = {Entanglement distribution and quantum storage of more than 8000 modes over a metropolitan network},
  author = {Angelo Gelmini Rodriguez and Louis Nicolas and Théo Sanchez Mejia and Pavel Sekatski and Nicolas Brunner and Towsif Taher and Rob Thew and Philippe Goldner and Mikael Afzelius},
  journal= {arXiv preprint arXiv:2608.13177},
  year   = {2026}
}