Towards highly multimode optical quantum memory for quantum repeaters

Jobez, Pierre; Timoney, Nuala; Laplane, Cyril; Etesse, Jean; Ferrier, Alban; Goldner, Philippe; Gisin, Nicolas; Afzelius, Mikael

doi:10.1103/physreva.93.032327

Cited by 115 publications

(155 citation statements)

References 52 publications

(85 reference statements)

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“…(iv) Unlike previous schemes, we note that the magnitude of slow light can be enhanced by continuously increasing the atom-atom interaction, as well as it is less affected by the condensate fluctuations. This reflects the advantage of present scheme over earlier schemes [53][54][55][56][57][58], which may help to realize longer optical storage (memory) applications [83][84][85].…”

Section: Introductionmentioning

confidence: 75%

“…Thus, promising optical information storage applications, such as reported in Refs. [83][84][85] for the heralded long-distance quantum communication [98], are expected.…”

Section: Discussionmentioning

confidence: 99%

“…More importantly, unlike single-ended optomechanical systems [53] and hybrid atom-cavity systems [54], the delay-bandwidth product in the present case can be greatly enhanced by continuously increasing atom-atom interaction, and therefore serve as a way to store an optical pulse [83,85].…”

Section: Fig 11 (Color Online)mentioning

confidence: 99%

“…Moreover, our BEC-cavity optomechanics setup has also been realized to transfer the quantum state of light fields to the collective density excitations of BEC [87]. For the reason, the present scheme may serve as a building block to realize efficient optical delay lines for quantum networks [53,85].…”

Section: Fig 11 (Color Online)mentioning

confidence: 99%

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Control of Fano resonances and slow light using Bose-Einstein condensates in a nanocavity

et al. 2017

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In this study, a standing wave in an optical nanocavity with Bose-Einstein condensate (BEC) constitutes a one-dimensional optical lattice potential in the presence of a finite two bodies atomic interaction. We report that the interaction of a BEC with a standing field in an optical cavity coherently evolves to exhibit Fano resonances in the output field at the probe frequency. The behaviour of the reported resonance shows an excellent compatibility with the original formulation of asymmetric resonance as discovered by Fano [U. Fano, Phys. Rev. 124, 1866(1961]. Based on our analytical and numerical results, we find that the Fano resonances and subsequently electromagnetically induced transparency of the probe pulse can be controlled through the intensity of the cavity standing wave field and the strength of the atom-atom interaction in the BEC. In addition, enhancement of the slow light effect by the strength of the atom-atom interaction and its robustness against the condensate fluctuations are realizable using presently available technology.

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Section: Introductionmentioning

confidence: 75%

“…Thus, promising optical information storage applications, such as reported in Refs. [83][84][85] for the heralded long-distance quantum communication [98], are expected.…”

Section: Discussionmentioning

confidence: 99%

Section: Fig 11 (Color Online)mentioning

confidence: 99%

Section: Fig 11 (Color Online)mentioning

confidence: 99%

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Control of Fano resonances and slow light using Bose-Einstein condensates in a nanocavity

et al. 2017

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“…We emphasize that although in our experimental demonstration we merely study the motion-induced decoherence for a cold-atomicgas ensemble, our findings and techniques developed do apply to other decoherence mechanisms and other physical systems, like the solid-state photon-echo quantum memories [8]. Note added.−After completing this work we became aware of a related experiment by Jobez et al [30].…”

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confidence: 99%

Operating Spin Echo in the Quantum Regime for an Atomic-Ensemble Quantum Memory

et al. 2015

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Spin echo is a powerful technique to extend atomic or nuclear coherence time by overcoming the dephasing due to inhomogeneous broadening. However, applying this technique to an ensemblebased quantum memory at single-quanta level remains challenging. In our experimental study we find that noise due to imperfection of the rephasing pulses is highly directional. By properly arranging the beam directions and optimizing the pulse fidelities, we have successfully managed to operate the spin echo technique in the quantum regime and observed nonclassical photon-photon correlations. In comparison to the case without applying the rephasing pulses, quantum memory lifetime is extended by 5 folds. Our work for the first time demonstrates the feasibility of harnessing the spin echo technique to extend lifetime of ensemble-based quantum memories at single-quanta level. In an atomic-ensemble quantum memory, inhomogeneous broadening due to ambient magnetic field, atomic random motion and interaction with host spins etc. severely limits the storage time [12,13]. One universal solution to overcome inhomogeneous broadening induced decoherence is to make use of the spin echo technique [14], where a series of π pulses are applied to reverse the phase evolution through population inversion. This technique has been widely used in storage of classical light pulses. For example, with the spin echo technique, the storage lifetime has been extended to second and minute regime in solid-state ensembles and atomic-gas ensembles, respectively [15,16]. However, whether this technique is applicable to the storage of quantum light or photons has not been resolved yet experimentally. The main concern [17,18] is that since the π pulses induce population inversion, tiny imperfection of them could result in background noises which are much stronger than the stored single-photon signals.In this letter we experimentally study the spin echo process of single excitations in a cold-atomic-gas quantum memory by employing stimulated Raman transitions. We find that the noise due to imperfection of the π pulses is highly directional. In our experiment, by carefully arranging the Raman-beam directions and optimizing the pulse fidelities, we have successfully reduced this noise to much lower than the single-photon signal. Quantum nature of the spin echo process is verified by observing nonclassical photon-photon correlations. In our demonstration, the distorted spin-wave state gets rephased by applying two π pulses and the quantum memory lifetime is increased by 5 folds. Our findings and techniques developed is applicable to all other ensemblebased quantum memories [1].In an atomic-ensemble quantum memory, a single quantum state is stored as a spin wave spreading over the whole ensemble [19,20]. The spin-wave state at t = 0 can be described aswhere N is the number of atoms, |g and |s are two atomic ground states, k s is the wavevector of the spin wave, r j (0) is the position of the j-th atom in the ensemble at t = 0. This state can be physically interpreted as...

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Photonic Integrated Quantum Memory in Rare‐Earth Doped Solids

Zhou,

Liu,

et al. 2023

Laser & Photonics Reviews

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An optical quantum memory is a device that can store photonic quantum information and release it after a controlled time. It is an essential component for overcoming channel losses in large‐scale quantum networks. Optical quantum memories have been demonstrated with various physical systems including atomic gases, single atoms in optical cavities, and rare‐earth‐ion doped solids. Now, quantum memories are marching toward miniaturization and integration for large‐scale practical applications. Solid state systems stand as a natural choice due to the physical stability and ease of micro or nano fabrication using well‐established techniques. In the past decade, considerable efforts have been devoted to developing photonic integrated quantum memories, that is, quantum memories based on micro/nano‐photonic structures manufactured in solids. Remarkable performances have been achieved with integrated quantum memories, with the advantages of lower laser/electric power requirements, small volumes, large storage densities, and easy implementations. In this article, the basic concepts of optical quantum memories, the state‐of‐the‐art technologies for fabricating integrated quantum memories in rare‐earth ions doped crystals, and recent advances are introduced, and the roadmap for developing practically useful devices for applications in quantum networks is discussed.

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Towards highly multimode optical quantum memory for quantum repeaters

Cited by 115 publications

References 52 publications

Control of Fano resonances and slow light using Bose-Einstein condensates in a nanocavity

Control of Fano resonances and slow light using Bose-Einstein condensates in a nanocavity

Operating Spin Echo in the Quantum Regime for an Atomic-Ensemble Quantum Memory

Photonic Integrated Quantum Memory in Rare‐Earth Doped Solids

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