Cold-Atom Temporally Multiplexed Quantum Memory with Cavity-Enhanced Noise Suppression

Heller, Lukas; Farrera, Pau; Heinze, Georg; Riedmatten, Hugues de

doi:10.1103/physrevlett.124.210504

Cited by 50 publications

(41 citation statements)

References 45 publications

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“…To overcome this problem, multiplexed versions of the DLCZ schemes were proposed 2,7,[54][55][56][57][58] . Multimode quantum storages of single SWs have been mainly implemented with rare-earth-ion-doped (REID) crystals [59][60][61][62] or cold atoms 58,[63][64][65][66][67][68][69][70][71] . With REID crystals, spin-wave-photon quantum correlations in more than 10 temporal modes have been demonstrated 59,60 via the DLCZ approach.…”

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confidence: 99%

Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts

Wang

Yan

et al. 2021

Commun Phys

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Quantum interfaces (QIs) that generate entanglement between photonic and spin-wave (atomic memory) qubits are basic building block for quantum repeaters. Realizing ensemble-based repeaters in practice requires quantum memory providing long lifetimes and multimode capacity. Significant progress has been achieved on these separate goals. The remaining challenge is to combine the two attributes into a single QI. Here, by establishing spatial multimode, magnetic-field-insensitive and long-wavelength spin-wave storage in laser-cooled atoms inside a phase-passively-stabilized polarization interferometer, we constructed a multiplexed QI that stores up to three long-lived spin-wave qubits. Using a feed-forward-controlled system, we demonstrated that a multiplexed QI gives rise to a 3-fold increase in the atom–photon (photon–photon) entanglement-generation probability compared with single-mode QIs. For our multiplexed QI, the measured Bell parameter is 2.51±0.01 combined with a memory lifetime of up to 1 ms. This work represents a key step forward in realizing fiber-based long-distance quantum communications.

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confidence: 99%

Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts

Wang

Yan

et al. 2021

Commun Phys

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“…We note that those efficiencies are very similar to the ones obtained in the QPG protocol 24 . To boost the efficiencies of the GEM one could design a larger and more dense atomic ensemble or prepare the ensemble inside a cavity resonant with the signal field that effectively boosts the optical depth and thus the efficiency 63 – 65 .…”

Section: Methodsmentioning

confidence: 99%

Optical-domain spectral super-resolution via a quantum-memory-based time-frequency processor

2022

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Existing super-resolution methods of optical imaging hold a solid place as an application in natural sciences, but many new developments allow for beating the diffraction limit in a more subtle way. One of the recently explored strategies to fully exploit information already present in the field is to perform a quantum-inspired tailored measurements. Here we exploit the full spectral information of the optical field in order to beat the Rayleigh limit in spectroscopy. We employ an optical quantum memory with spin-wave storage and an embedded processing capability to implement a time-inversion interferometer for input light, projecting the optical field in the symmetric-antisymmetric mode basis. Our tailored measurement achieves a resolution of 15 kHz and requires 20 times less photons than a corresponding Rayleigh-limited conventional method. We demonstrate the advantage of our technique over both conventional spectroscopy and heterodyne measurements, showing potential for application in distinguishing ultra-narrowband emitters, optical communication channels, or signals transduced from lower-frequency domains.

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“…high p but still low enough to minimise double pair emissions that scale as p 2 . This assumes a single-mode memory and thus could be further reduced by using temporally multimode memories 39,40 .…”

Section: Quantum Repeatersmentioning

confidence: 99%

“…These are well-established platforms for quantum information storage. High efficiency 53 , temporal 40 and spatial multimode storage 50 have been performed among many other experiments in the last years. There has been a growing interest in deploying cold-atom experiments in space for more than a decade.…”

Section: Candidate Memory Platformsmentioning

confidence: 99%

Proposal for space-borne quantum memories for global quantum networking

et al. 2021

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Global-scale quantum communication links will form the backbone of the quantum internet. However, exponential loss in optical fibres precludes any realistic application beyond few hundred kilometres. Quantum repeaters and space-based systems offer solutions to overcome this limitation. Here, we analyse the use of quantum memory (QM)-equipped satellites for quantum communication focussing on global range repeaters and memory-assisted (MA-) QKD, where QMs help increase the key rate by synchronising otherwise probabilistic detection events. We demonstrate that satellites equipped with QMs provide three orders of magnitude faster entanglement distribution rates than existing protocols based on fibre-based repeaters or space systems without QMs. We analyse how entanglement distribution performance depends on memory characteristics, determine benchmarks to assess the performance of different tasks and propose various architectures for light-matter interfaces. Our work provides a roadmap to realise unconditionally secure quantum communications over global distances with near-term technologies.

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Cold-Atom Temporally Multiplexed Quantum Memory with Cavity-Enhanced Noise Suppression

Cited by 50 publications

References 45 publications

Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts

Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts

Optical-domain spectral super-resolution via a quantum-memory-based time-frequency processor

Proposal for space-borne quantum memories for global quantum networking

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