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

Quantum 2.0 Conference and Exhibition

On-Demand and Long-Lived Solid-State Quantum Memories for Multiplexed Quantum Network Links

Jonathan Hänni, Alberto E. Rodríguez-Moldes, Félicien Appas, Sören Wengerowsky, Dario Lago-Rivera, Markus Teller, Samuele Grandi, Hugues de Riedmatten

Published Jan 1, 2025• 1 citation
Publisher

Abstract

In this talk, we demonstrate storage of heralded single photons in a dynamically decoupled spin-wave quantum memory for up to 180 microseconds and on-demand telecom-heralded entanglement of two memories with up to 15 temporal modes.
DOI
10.1364/quantum.2025.qw4a.2

Related papers

Heralded Entanglement of On-Demand Spin-Wave Solid-State Quantum Memories for Multiplexed Quantum Network Links

Jonathan Hänni, Alberto E. Rodríguez-Moldes, Félicien Appas +5 more

The ability to distribute heralded entanglement between distant matter nodes is a primitive for the implementation of large-scale quantum networks. Some of the most crucial requirements for future applications include high heralding rates at telecom wavelengths, multiplexed operation, and on-demand retrieval of stored excitations for synchronization of separate quantum links. Despite tremendous progress in various physical systems, the demonstration of telecom-heralded entanglement between quantum nodes featuring both multiplexed operation and on-demand retrieval remains elusive. In this work, we combine narrow band parametric photon-pair sources and solid-state quantum memories based on rare-earth doped crystals to demonstrate telecom-heralded entanglement between spatially separated spin-wave quantum memories with fully adjustable recall time and temporal multiplexing of 15 modes. In a first experiment, the storage in the spin state is conditioned on the entanglement heralding. We take advantage of the control over readout pulse phase to achieve feedforward conditional phase shifts on the stored photons depending on which heralding detector clicked. We exploit this effect to double the entanglement heralding rate for a given quantum state up to 510 counts / s , with an associated detection rate of 0.32 counts / s and measured positive concurrence by up to 6 standard deviations. In a second experiment, we simulate the communication time of a long-distance link by implementing an unconditional storage scheme with a dead time of 100 μ s . We take advantage of temporal multiplexing to increase the entanglement rates by a factor of 15 with respect to single mode storage, reaching a value of 22 counts / s per heralding detector. These results establish our architecture as a prime candidate for the implementation of scalable high-rate quantum network links.

arXiv:2501.04131•Physical Review X•Aug 15, 2025•13 citations

A solid-state temporally multiplexed quantum memory array at the single-photon level

Markus Teller, Susana Plascencia, Cristina Sastre Jachimska +2 more

Abstract The exploitation of multimodality in different degrees of freedom is one of the most promising ways to increase the rate of heralded entanglement between distant quantum nodes. In this paper, we realize a spatially-multiplexed solid-state quantum memory array with ten individually controllable spin-wave memory cells featuring on-demand read-out and temporal multiplexing. By combining spatial and temporal multiplexing, we store weak coherent pulses at the single-photon level in up to 250 spatio-temporal modes, with an average signal-to-noise ratio of 10(2). We perform a thorough characterization of the whole system, including its multiplexing and demultiplexing stage. We verify that the memory array exhibits low cross-talk even at the single-photon level. The measured performance indicates readiness for storing non-classical states and promises a speed-up in entanglement distribution rates.

arXiv:2507.12200•npj Quantum Information•Jun 4, 2025•16 citations

Towards the spin-wave storage of entangled photons in a solid state quantum memory

Daniel Rieländer, Alessandro Seri, Mustafa Gündoğan +3 more

To establish remote quantum networks, the distribution of entanglement over long distances is required. In order to overcome transmission loss in quantum channels (e.g. optical fibers), quantum repeater architectures have been proposed [1]. The availability of single photons at telecom wavelength entangled with photons stored in long-lived quantum memories for synchronization issues [1] is a crucial resource in this context. In this contribution, we will describe our efforts towards the demonstration of entanglement between a telecom photon and a long-lived spin wave solid-state quantum memory.

Frontiers in Optics•Jan 1, 2015•0 citations

Multiplexed Spin Photon Interfaces in Solid State Quantum Memories

Hugues de Riedmatten

We report experiments demonstrating entanglement between a single photon and a multimode solid-state spin wave quantum memory with on demand read-out. We also demonstrate a frequency multiplexed integrated quantum storage device.

Quantum Information and Measurement (QIM)•Jan 1, 2019•0 citations

Quantum Correlations between Single Telecom Photons and a Multimode On-Demand Solid-State Quantum Memory

Alessandro Seri, Andreas Lenhard, Daniel Rieländer +4 more

Quantum correlations between long-lived quantum memories and telecom photons that can propagate with low loss in optical fibers are an essential resource for the realization of large-scale quantum information networks.Significant progress has been realized in this direction with atomic and solid-state systems.Here, we demonstrate quantum correlations between a telecom photon and a multimode ondemand solid state quantum memory.This is achieved by mapping a correlated single photon onto a spin collective excitation in a Pr 3þ ∶Y 2 SiO 5 crystal for a controllable time.The stored single photons are generated by cavity-enhanced spontaneous parametric down-conversion and heralded by their partner photons at telecom wavelength.These results represent the first demonstration of a multimode on-demand solid state quantum memory for external quantum states of light.They provide an important resource for quantum repeaters and pave the way for the implementation of quantum information networks with distant solid state quantum nodes.

arXiv:1701.09004•Physical Review X•May 24, 2017•91 citations

Quantum correlations between single telecom photons and a multimode on-demand solid-state quantum memory

Alessandro Seri, Andreas Lenhard, Daniel Rieländer +4 more

Quantum correlations between long-lived quantum memories and telecom photons that can propagate with low loss in optical fibers are an essential resource for the realization of large-scale quantum information networks. Significant progress has been realized in this direction with atomic and solid-state systems. Here, we demonstrate quantum correlations between a telecom photon and a multimode ondemand solid state quantum memory. This is achieved by mapping a correlated single photon onto a spin collective excitation in a Pr 3+ :Y 2 SiO 5 crystal for a controllable time. The stored single photons are generated by cavity-enhanced spontaneous parametric down-conversion and heralded by their partner photons at telecom wavelength. These results represent the first demonstration of a multimode on-demand solid state quantum memory for external quantum states of light. They provide an important resource for quantum repeaters and pave the way for the implementation of quantum information networks with distant solid state quantum nodes.

•May 24, 2017•21 citations
The ability to distribute heralded entanglement between distant matter nodes is a primitive for the implementation of large-scale quantum networks. Some of the most crucial requirements for future applications include high heralding rates at telecom wavelengths, multiplexed operation, and on-demand retrieval of stored excitations for synchronization of separate quantum links. Despite tremendous progress in various physical systems, the demonstration of telecom-heralded entanglement between quantum nodes featuring both multiplexed operation and on-demand retrieval remains elusive. In this work, we combine narrow band parametric photon-pair sources and solid-state quantum memories based on rare-earth doped crystals to demonstrate telecom-heralded entanglement between spatially separated spin-wave quantum memories with fully adjustable recall time and temporal multiplexing of 15 modes. In a first experiment, the storage in the spin state is conditioned on the entanglement heralding. We take advantage of the control over readout pulse phase to achieve feedforward conditional phase shifts on the stored photons depending on which heralding detector clicked. We exploit this effect to double the entanglement heralding rate for a given quantum state up to 510 counts / s , with an associated detection rate of 0.32 counts / s and measured positive concurrence by up to 6 standard deviations. In a second experiment, we simulate the communication time of a long-distance link by implementing an unconditional storage scheme with a dead time of 100 μ s . We take advantage of temporal multiplexing to increase the entanglement rates by a factor of 15 with respect to single mode storage, reaching a value of 22 counts / s per heralding detector. These results establish our architecture as a prime candidate for the implementation of scalable high-rate quantum network links.
Abstract The exploitation of multimodality in different degrees of freedom is one of the most promising ways to increase the rate of heralded entanglement between distant quantum nodes. In this paper, we realize a spatially-multiplexed solid-state quantum memory array with ten individually controllable spin-wave memory cells featuring on-demand read-out and temporal multiplexing. By combining spatial and temporal multiplexing, we store weak coherent pulses at the single-photon level in up to 250 spatio-temporal modes, with an average signal-to-noise ratio of 10(2). We perform a thorough characterization of the whole system, including its multiplexing and demultiplexing stage. We verify that the memory array exhibits low cross-talk even at the single-photon level. The measured performance indicates readiness for storing non-classical states and promises a speed-up in entanglement distribution rates.
To establish remote quantum networks, the distribution of entanglement over long distances is required. In order to overcome transmission loss in quantum channels (e.g. optical fibers), quantum repeater architectures have been proposed [1]. The availability of single photons at telecom wavelength entangled with photons stored in long-lived quantum memories for synchronization issues [1] is a crucial resource in this context. In this contribution, we will describe our efforts towards the demonstration of entanglement between a telecom photon and a long-lived spin wave solid-state quantum memory.
Quantum correlations between long-lived quantum memories and telecom photons that can propagate with low loss in optical fibers are an essential resource for the realization of large-scale quantum information networks.Significant progress has been realized in this direction with atomic and solid-state systems.Here, we demonstrate quantum correlations between a telecom photon and a multimode ondemand solid state quantum memory.This is achieved by mapping a correlated single photon onto a spin collective excitation in a Pr 3þ ∶Y 2 SiO 5 crystal for a controllable time.The stored single photons are generated by cavity-enhanced spontaneous parametric down-conversion and heralded by their partner photons at telecom wavelength.These results represent the first demonstration of a multimode on-demand solid state quantum memory for external quantum states of light.They provide an important resource for quantum repeaters and pave the way for the implementation of quantum information networks with distant solid state quantum nodes.
Quantum correlations between long-lived quantum memories and telecom photons that can propagate with low loss in optical fibers are an essential resource for the realization of large-scale quantum information networks. Significant progress has been realized in this direction with atomic and solid-state systems. Here, we demonstrate quantum correlations between a telecom photon and a multimode ondemand solid state quantum memory. This is achieved by mapping a correlated single photon onto a spin collective excitation in a Pr 3+ :Y 2 SiO 5 crystal for a controllable time. The stored single photons are generated by cavity-enhanced spontaneous parametric down-conversion and heralded by their partner photons at telecom wavelength. These results represent the first demonstration of a multimode on-demand solid state quantum memory for external quantum states of light. They provide an important resource for quantum repeaters and pave the way for the implementation of quantum information networks with distant solid state quantum nodes.