Highly efficient optical quantum memory with long coherence time in cold atoms

Cho, Young Wook; Campbell, Geoff; Everett, Jesse L.; Bernu, J.; Higginbottom, Daniel; Cao, Mingtao; Geng, Jiao; Robins, Nicholas; Lam, Ping Koy; Buchler, Ben C.

doi:10.1364/optica.3.000100

Cited by 190 publications

(161 citation statements)

References 57 publications

(126 reference statements)

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“…For the simulations the control field Rabi frequency was Ω ± = 2π × (2.4 ± 0.1) MHz and the optical depth and gradient parameters are measured from the experiment. The ground-state decay γ 0 =500 Hz was based on previous experiments in the same MOT [43]. A small difference in the simulation rephasing time is introduced to match the experimental rephasing.…”

Section: Resultsmentioning

confidence: 99%

Dynamical observations of self-stabilizing stationary light

Everett¹,

Campbell²,

Cho³

et al. 2016

Nature Phys

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Precise control of atom-light interactions is vital to many quantum information protocols. In particular, atomic systems can be used to slow and store light to form a quantum memory. Optical storage can be achieved via stopped light, where no optical energy remains in the atoms, or as stationary light, where some optical energy remains present during storage. In this work, we demonstrate a form of self-stabilising stationary light. From any initial state, our atom-light system evolves to a stable configuration that is devoid of coherent emission from the atoms, yet may contain bright optical excitation. This phenomenon is verified experimentally in a cloud of cold Rb87 atoms. The spinwave in our atomic cloud is imaged from the side allowing direct comparison with theoretical predictions.Coherent atom light interactions lie at the heart of many quantum information systems [1, 2]. In particular, implementations of quantum repeaters will likely rely on mapping of photonic states onto atomic systems to enable storage of quantum information [3,4]. Deterministic quantum logic gates in optical systems may also rely on atomic state mapping to enable nonlinear photon-photon interactions [5,6,7,8,9]. A fundamental issue facing any attempt to implement nonlinear cross phase modulation (XPM) is that the interaction is inherently very weak. Techniques are therefore required to increase the interaction time or interaction strength to allow useful amounts of phase shift. Interaction strength can be scaled up by choosing a nonlinear medium with strong optical interactions, such as Rydberg atoms [10,11]. A more general approach that works for any medium is to use smaller interaction volumes, since this increases the electric field per photon, and longer interaction times, which may be achieved by using an 1 arXiv:1609.08287v1 [quant-ph]

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Section: Resultsmentioning

confidence: 99%

Dynamical observations of self-stabilizing stationary light

Everett¹,

Campbell²,

Cho³

et al. 2016

Nature Phys

Self Cite

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“…The hybrid scheme holds all the advantages of the engineered absorption scheme, such as high mode capacity, low noise, realizable longer storage time and on-demand readout (although it has a delay after the second control pulse). Currently, the hybrid scheme has two successful approaches, Raman-GEM [59, 62] and Λ-AFC [63, 64]. Raman-GEM combines the Raman and GEM approaches and its energy structure and the storage and retrieval process are shown in figures 3(a) and (b).…”

Section: Overview Of Quantum Memory Approachesmentioning

confidence: 99%

Optical quantum memory based on electromagnetically induced transparency

Slattery

Tang

2017

J. Opt.

103

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Electromagnetically induced transparency (EIT) is a promising approach to implement quantum memory in quantum communication and quantum computing applications. In this paper, following a brief overview of the main approaches to quantum memory, we provide details of the physical principle and theory of quantum memory based specifically on EIT. We discuss the key technologies for implementing quantum memory based on EIT and review important milestones, from the first experimental demonstration to current applications in quantum information systems.

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“…Via EIT, the group velocity of an optical pulse can be manipulated significantly and, moreover, an optical pulse can be coherently mapped into and out of atomic coherence, enabling atomic quantum memory for photons [32][33][34][35][36][37]. However, the EIT effect cannot enhance nonlinear interactions between optical pulses because, in the limit of zero group velocity, only atomic coherence persists with no remaining optical excitations.…”

Section: Introductionmentioning

confidence: 99%

Experimental Demonstration of Quantum Stationary Light Pulses in an Atomic Ensemble

et al. 2018

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We report an experimental demonstration of the nonclassical stationary light pulse (SLP) in a cold atomic ensemble. A single collective atomic excitation is created and heralded by detecting a Stokes photon in the spontaneous Raman scattering process. The heralded single atomic excitation is converted into a single stationary optical excitation or the single-photon SLP, whose effective group velocity is zero, effectively forming a trapped single-photon pulse within the cold atomic ensemble. The single-photon SLP is then released from the atomic ensemble as an anti-Stokes photon after a specified trapping time. The second-order correlation measurement between the Stokes and anti-Stokes photons reveals the nonclassical nature of the single-photon SLP. Our work paves the way toward quantum nonlinear optics without a cavity.

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Highly efficient optical quantum memory with long coherence time in cold atoms

Cited by 190 publications

References 57 publications

Dynamical observations of self-stabilizing stationary light

Dynamical observations of self-stabilizing stationary light

Optical quantum memory based on electromagnetically induced transparency

Experimental Demonstration of Quantum Stationary Light Pulses in an Atomic Ensemble

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