Electromagnetically induced transparency‐based slow and stored light in warm atoms

Novikova, Irina; Walsworth, Ronald L.; Xiao, Yanhong

doi:10.1002/lpor.201100021

Cited by 312 publications

(197 citation statements)

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“…[20][21][22] of the main text) and experimentally (see Ref. [4,23] of the main text). Besides, what really matters would be the quantum fidelity of CPO-storage, which is not adressed in the manuscript.…”

Section: Symmetric Cpo Modementioning

confidence: 94%

“…In this context, Λ-type three-level atomic systems have received particular attention since the coherence between the ground states may have a long lifetime and can, thus, be used for storage [2,3]. In gas cells, high efficiencies were obtained in alkalimetal atoms [4] using electromagnetically induced transparency (EIT) close to [5] or far off optical resonance [6], gradient echo memories [7], or four-wave mixing [8]. Since all these methods are based on the excitation of the Raman coherence between the lower states of the system, they are sensitive to decoherence effects.…”

mentioning

confidence: 99%

“…the ground-state-population difference, which decays at rate γ t . Since we considered the input signal spectrum to be included within the CPO linewidth, the first-order adiabatic restriction erases dispersive effects along propagation and rigorous optimization such as in EIT protocols [4,[20][21][22][23] would require to go beyond this approximation. However, as well as EIT occurs when the saturation broadening overcomes the Raman decoherence [24], our adiabatic model shows that CPO occurs when the saturation broadening overcomes the ground-states de-cay (s > 3γ t /Γ 0 ).…”

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confidence: 99%

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Coherent Population Oscillation-Based Light Storage

et al. 2017

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We theoretically study the propagation and storage of a classical field in a Λ-type atomic medium using coherent population oscillations (CPOs). We show that the propagation eigenmodes strongly relate to the different CPO modes of the system. Light storage in such modes is discussed by introducing a "populariton" quantity, a mixture of populations and field, by analogy to the dark state polariton used in the context of electromagnetically induced transparency light storage protocol. As experimentally shown, this memory relies on populations and is then -by contrast with usual Raman coherence optical storage protocols -robust to dephasing effects.PACS numbers: 42.50. Gy, 42.25.Bs, 42.50.Md The architectures proposed to implement optical quantum information and communication protocols generally rely on quantum memories, i.e. devices able to store quantum states of light and retrieve them on demand with high fidelity and efficiency [1]. Within the last decade, much effort has been put towards their implementation in solid-state systems, ion or neutral atomic ensembles. In this context, Λ-type three-level atomic systems have received particular attention since the coherence between the ground states may have a long lifetime and can, thus, be used for storage [2,3]. In gas cells, high efficiencies were obtained in alkalimetal atoms [4] using electromagnetically induced transparency (EIT) close to [5] or far off optical resonance [6], gradient echo memories [7], or four-wave mixing [8]. Since all these methods are based on the excitation of the Raman coherence between the lower states of the system, they are sensitive to decoherence effects. Recently, it was experimentally shown that coherent population oscillations (CPOs) can be used as a storage medium for light. Experimental demonstrations were performed using metastable helium (He*) vapor at room temperature [9], as well as in cold and warm cesium [10,11]. CPOs occur in a two-level system when two detuned coherent electric fields of different amplitudes drive the same transition. When the detuning between the fields is smaller than the decay rate of the upper level, the dynamics of the saturation opens a transparency window in the absorption profile of the weak field [12][13][14]. The CPO resonance width may be decreased when the upper level decays to a long-lived shelving state, leading to an ultranarrow CPO resonance and a memory behavior [15]. Another option is to use a Λ-system where two CPOs may occur in opposite phase on the two transitions, leading to a global CPO between the two lower states [16]. This implies an ultranarrow transmission resonance for the weak field broadened by the ground states' decay rate, which can be used for storage [9][10][11]. Since it involves only populations, CPO-based light storage protocol is robust to dephasing effects, by contrast with the EIT-based protocol which involves Raman coherence. In this Letter, we theoretically explore the Λ-system option. First, we study the propagation of a weak signal field in the medium. We...

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Section: Symmetric Cpo Modementioning

confidence: 94%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Coherent Population Oscillation-Based Light Storage

et al. 2017

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“…Some reviews on EIT in atomic systems can be found in Refs. [11][12][13][14][15][16][17][18][19][20].…”

Section: Introduction and Physical Basismentioning

confidence: 99%

Electromagnetically induced transparency in optical microcavities

2017

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Electromagnetically induced transparency (EIT)is a quantum interference effect arising from different transition pathways of optical fields. Within the transparency window, both absorption and dispersion properties strongly change, which results in extensive applications such as slow light and optical storage. Due to the ultrahigh quality factors, massive production on a chip and convenient all-optical control, optical microcavities provide an ideal platform for realizing EIT. Here we review the principle and recent development of EIT in optical microcavities. We focus on the following three situations. First, for a coupled-cavity system, all-optical EIT appears when the optical modes in different cavities couple to each other. Second, in a single microcavity, all-optical EIT is created when interference happens between two optical modes. Moreover, the mechanical oscillation of the microcavity leads to optomechanically induced transparency. Then the applications of EIT effect in microcavity systems are discussed, including light delay and storage, sensing, and field enhancement. A summary is then given in the final part of the paper.

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“…This demands the output of the first operation to be a suitable input for a second memory operation. Built on recent successes [20][21][22][23], we consider room temperature atomic vapor memories as the elements that comprise a series of cascadable devices that could form the foundation of a quantum network. Room temperature systems are a promising direction, as they can offer a relatively inexpensive experimental overhead while also having strong light matter interaction at the single photon level [24][25][26].…”

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confidence: 99%

Cascading quantum light-matter interfaces with minimal interconnection losses

Namazi¹,

Mittiga²,

Kupchak³

et al. 2015

Phys. Rev. A

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The ability to interface multiple optical quantum devices is a key milestone towards the development of future quantum networks that are capable of sharing and processing quantum information encoded in light. One of the requirements for any node of these quantum networks will be cascadability, i.e. the ability to drive the input of a node using the output of another node. Here, we report the cascading of quantum light-matter interfaces by storing few-photon level pulses of light in warm vapor followed by the subsequent storage of the retrieved field onto a second ensemble. We demonstrate that even after the sequential storage, the final signal-to-background ratio can remain greater than 1 for weak pulses containing 8 input photons on average.PACS numbers: 42.50. Ex, 42.50.Gy Any machine can be defined as a device composed of many constituents with their own specific functions but when interfaced together, are designed to carry out a much greater task. This same description would hold true for a quantum information processor, a complex machine capable of operating and processing quantum entities encoded with information. Given the recent success in the creation and control of individual quantum systems with a variety of physical architectures [1,2], the next logical step towards the realization of such a quantum machine is the interconnection between multiple quantum interfaces [3][4][5][6]. This type of functionality will be a prerequisite for networks in which quantum information and entanglement can be shared, either sequentially or simultaneously [7][8][9].The success of these networks will rely on having universal quantum nodes producing outputs suited for driving (as inputs) succeeding quantum nodes. This is the concept of quantum cascadability [10], and it is a necessary attribute for quantum computer architectures and quantum communication protocols [11][12][13]. By its definition, the concept of cascading has been widely implemented in setups based upon the interconnecting of quantum state sources and memories [18,19]. However, protocols or operations demanding another degree of cascading, that is setups that interconnect sources and multiple devices (i.e. memories) in a sequential manner have been primarily unexplored.Of the existing multi-device protocols, many will be reliant on operational quantum memories [14], and furthermore on the functionality to cascade these devices, i.e. to have quantum memories that efficiently interface with the output of a preceding memory. More specifically, cascading of quantum memories are necessary for certain one-way quantum computing schemes via clusters states with memory-assisted feed-forward operations [15], the implementation of conditional CZ gates utilizing quantum optical memories connected in series [16] and generating multi-mode quantum states by cascading multiple four-wave mixing processes in atomic ensembles [17]. The foundation of these implementations will re- quire cascaded storage and retrieval schemes that exhibit both primary and secondary, high ...

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Electromagnetically induced transparency‐based slow and stored light in warm atoms

Cited by 312 publications

References 182 publications

Coherent Population Oscillation-Based Light Storage

Coherent Population Oscillation-Based Light Storage

Electromagnetically induced transparency in optical microcavities

Cascading quantum light-matter interfaces with minimal interconnection losses

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