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

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

URL: http://arxiv.org/abs/2608.13177v1
Date: Thu, 13 Aug 2026 12:42:12 GMT
Title: Entanglement distribution and quantum storage of more than 8000 modes over a metropolitan network
Abstract summary: Entanglement generation between telecommunication photons and matter is central to fibre-based quantum repeaters.<n>Rare-earth-ion ensembles offer large temporal multimode storage by exploiting the numerous spectral channels within their absorption spectrum.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: 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 $^{171}$Yb$^{3+}$:Y$_2$SiO$_5$ multimode quantum memory, featuring a 250 MHz bandwidth and a $76.6~μ\mathrm{s}$ 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 $125~μ\mathrm{s}$ 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 $63~μ\mathrm{s}$.

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