Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Conference on Lasers and Electro-Optics

Telecom-heralded entanglement distribution between remote, multimode quantum memories in the solid state

Samuele Grandi, Dario Lago-Rivera, Jelena V. Rakonjac, Alessandro Seri, Hugues de Riedmatten

Published Jan 1, 2021• 0 citations
Publisher

Abstract

we demonstrate entanglement between two quantum nodes, where the entanglement is generated by non-degenerate photon pair sources and stored in rare-earth based quantum memories that share a delocalized excitation.
DOI
10.1364/cleo_qels.2021.fm4m.1

Related papers

Telecom-heralded entanglement distribution between remote multimode solid-state quantum memories

Samuele Grandi, Dario Lago-Rivera, Jelena V. Rakonjac +2 more

We demonstrate entanglement between two quantum nodes. The entanglement is generated by parametric down conversion, heralded by telecom photons and stored in multimode rare-earth based quantum memories. The memories share a delocalized excitation.

Quantum Information and Measurement (QIM)•Jan 1, 2021•0 citations

Remote entanglement between solid-state quantum memories

Jonathan Hänni, Alberto Rodriguez-Moldes Sebastian, Félicien Appas +4 more

We report our progress towards the demonstration of telecom-heralded matter-matter entanglement between solid-state, on-demand and remote quantum memories based on rare-earth—doped crystals.

Quantum 2.0 Conference and Exhibition•Jan 1, 2024•0 citations

Quantum Repeater Links with Rare-Earth Solid-State Quantum Memories

Félicien Appas, Jonathan Hänni, Alberto E. Rodríguez-Moldes +6 more

In this talk, we report on recent progress towards the realization of quantum repeaters based on rare-earth doped crystal quantum memories (QM) and cavity-enhanced SPDC photon-pair sources. We first present our demonstration of on-demand telecom-heralded entanglement between multimode solid-state quantum memories with high rate and fully adjustable recall time. Then, we show how we successfully established long-distance non-classical correlations between a telecom photon and a QM in a field-deployed experiment in the city of Barcelona.

International Conference on Transparent Optical Networks•Jul 6, 2025•0 citations

Entanglement between a telecom photon and a spin-Wave solid-state multimode quantum memory

Jelena V. Rakonjac, Dario Lago-Rivera, Alessandro Seri +3 more

We demonstrate entanglement between a telecom photon and a solid-state multimode quantum memory. The entanglement is maintained for an optical excitation (with a fidelity high enough to violate a Bell inequality) and a spin-wave excitation.

Quantum Information and Measurement (QIM)•Jan 1, 2021•0 citations

Entanglement between a telecom photon and a spin-Wave solid-state multimode quantum memory

Jelena V. Rakonjac, Dario Lago-Rivera, Alessandro Seri +3 more

We demonstrate entanglement between a telecom photon and a solid-state multimode quantum memory. The entanglement is maintained for an optical excitation (with a fidelity high enough to violate a Bell inequality) and a spin-wave excitation.

Quantum 2.0 Conference and Exhibition•Jan 1, 2022•0 citations

Entanglement between a Telecom Photon and an On-Demand Multimode Solid-State Quantum Memory

Jelena V. Rakonjac, Dario Lago-Rivera, Alessandro Seri +3 more

Entanglement between photons at telecommunication wavelengths and long-lived quantum memories is one of the fundamental requirements of long-distance quantum communication. Quantum memories featuring on-demand readout and multimode operation are additional precious assets that will benefit the communication rate. In this Letter, we report the first demonstration of entanglement between a telecom photon and a collective spin excitation in a multimode solid-state quantum memory. Photon pairs are generated through widely nondegenerate parametric down-conversion, featuring energy-time entanglement between the telecom-wavelength idler and a visible signal photon. The latter is stored in a Pr^{3+}:Y_{2}SiO_{5} crystal as a spin wave using the full atomic frequency comb scheme. We then recall the stored signal photon and analyze the entanglement using the Franson scheme. We measure conditional fidelities of 92(2)% for excited-state storage, enough to violate a Clauser-Horne-Shimony-Holt inequality, and 77(2)% for spin-wave storage. Taking advantage of the on-demand readout from the spin state, we extend the entanglement storage in the quantum memory for up to 47.7 μs, which could allow for the distribution of entanglement between quantum nodes separated by distances of up to 10 km.

arXiv:2106.05079•Physical Review Letters•Nov 19, 2021•76 citations
In this talk, we report on recent progress towards the realization of quantum repeaters based on rare-earth doped crystal quantum memories (QM) and cavity-enhanced SPDC photon-pair sources. We first present our demonstration of on-demand telecom-heralded entanglement between multimode solid-state quantum memories with high rate and fully adjustable recall time. Then, we show how we successfully established long-distance non-classical correlations between a telecom photon and a QM in a field-deployed experiment in the city of Barcelona.
Entanglement between photons at telecommunication wavelengths and long-lived quantum memories is one of the fundamental requirements of long-distance quantum communication. Quantum memories featuring on-demand readout and multimode operation are additional precious assets that will benefit the communication rate. In this Letter, we report the first demonstration of entanglement between a telecom photon and a collective spin excitation in a multimode solid-state quantum memory. Photon pairs are generated through widely nondegenerate parametric down-conversion, featuring energy-time entanglement between the telecom-wavelength idler and a visible signal photon. The latter is stored in a Pr^{3+}:Y_{2}SiO_{5} crystal as a spin wave using the full atomic frequency comb scheme. We then recall the stored signal photon and analyze the entanglement using the Franson scheme. We measure conditional fidelities of 92(2)% for excited-state storage, enough to violate a Clauser-Horne-Shimony-Holt inequality, and 77(2)% for spin-wave storage. Taking advantage of the on-demand readout from the spin state, we extend the entanglement storage in the quantum memory for up to 47.7 μs, which could allow for the distribution of entanglement between quantum nodes separated by distances of up to 10 km.