Single-photon superradiance in cold atoms

Oliveira, Rafael A. de; Mendes, Milrian S.; Martins, Weliton S.; Saldanha, Pablo L.; Tabosa, J. W. R.; Felinto, D.

doi:10.1103/physreva.90.023848

Cited by 52 publications

(71 citation statements)

References 26 publications

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“…3c). For t = 6 µs, the process efficiency for |Ψ super is ε s (t) = 0.33(1)%, while for |ψ 1 , it is ε 1 (t) = 0.17(1)%, corresponding to a ratio ε s /ε 1 of 1.94 (13). The ratio decreases monotonically with t, and by t = 55 µs, it is 1.34 (5).…”

Section: Fig 1 (A) Twomentioning

confidence: 99%

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Enhanced Quantum Interface with Collective Ion-Cavity Coupling

et al. 2015

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We prepare a maximally entangled state of two ions and couple both ions to the mode of an optical cavity. The phase of the entangled state determines the collective interaction of the ions with the cavity mode, that is, whether the emission of a single photon into the cavity is suppressed or enhanced. By adjusting this phase, we tune the ion-cavity system from sub-to superradiance. We then encode a single qubit in the two-ion superradiant state and show that this encoding enhances the transfer of quantum information onto a photon.Sub-and superradiance are fundamental effects in quantum optics arising in systems that are symmetric under the interchange of any pair of particles [1][2][3]. Superradiance has been widely studied in many-atom systems, in which effects such as a phase transition [4,5] and narrow-linewidth lasing [6] have recently been observed. For few-atom systems, each atom's state and position can be precisely controlled, and thus collective emission effects such as Rydberg blockade [7] and the Lamb shift [8] can be tailored. In a pioneering experiment using two trapped ions, variation of the ions' separation allowed both sub-and superradiance to be observed, with the excited-state lifetime extended or reduced by up to 1.5% [9]. The contrast was limited because spontaneous emission from the ions was not indistinguishable, as the ions' separation was on the order of the wavelength of the emitted radiation. This limitation can be overcome by observing preferential emission into a single mode, such as the mode defined by incident radiation [1] or by an optical cavity. In a cavity setting, indistinguishability is guaranteed when the emitters are equally coupled to the mode, even if they are spatially separated. Subradiance corresponds to a suppressed interaction of the joint state of the emitters with the cavity mode, while for the superradiant state, the interaction is enhanced.In the context of quantum networks [10,11], superradiance can improve a quantum interface when one logical qubit is encoded across N physical qubits. In the DLCZ protocol for heralded remote entanglement, efficient retrieval of stored photons is based on superradiance [12,13]. Superradiance can also improve the performance of a deterministic, cavity-based interface, which enables the direct transmission of quantum information between network nodes [14]. If a qubit is encoded in the state.. ↓ N , the coupling rate to the cavity is enhanced from the single-qubit rate g to the effective rate g √ N , relaxing the technical requirements for strong coupling between light and matter [15]. This state corresponds to the first step in the superradiant cascade described by Dicke [1]. In contrast, subradiant states are antisymmetrized, resulting in suppressed emission. From a quantum-information perspective, subradiant states are interesting because they span a decoherence-free subspace [16][17][18]. A subradiant state of two superconducting qubits coupled to a cavity has recently been prepared [19].Here, we generate collective states of tw...

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Section: Fig 1 (A) Twomentioning

confidence: 99%

“…In the DLCZ protocol for heralded remote entanglement, efficient retrieval of stored photons is based on superradiance [12,13]. Superradiance can also improve the performance of a deterministic, cavity-based interface, which enables the direct transmission of quantum information between network nodes [14].…”

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Enhanced Quantum Interface with Collective Ion-Cavity Coupling

et al. 2015

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“…(15) was derived using Eq. (21). However, the disorder terms was neglected in the structure factors.…”

Section: Review Of the Previous Experiments And Conclusionmentioning

confidence: 99%

Collective effects in the radiation pressure force

et al. 2016

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We discuss the role of diffuse, Mie and cooperative scattering on the radiation pressure force acting on the center of mass of a cloud of cold atoms. Even though a mean-field Ansatz (the 'timed Dicke state'), previously derived from a cooperative scattering approach, has been shown to agree satisfactorily with experiments, diffuse scattering also describes very well most features of the radiation pressure force on large atomic clouds. We compare in detail an incoherent, random walk model for photons and a diffraction approach to the more complete description based on coherently coupled dipoles. We show that a cooperative scattering approach, although it provides a quite complete description of the scattering process, is not necessary to explain the previous experiments on the radiation pressure force.

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“…This approach provides a complementary interpretation of the influence functionals S L and S NL in terms of the environment state vectors appearing in Eqs. (10) and (11). We first develop the local decoherence functional by taking the imaginary part of (5) and using the identity Re[ AB ] = 1 2 {A, B} for generic operators A, B.…”

Section: Nonlocality and Quality Of Informationmentioning

confidence: 99%

“…In this paper, we show that an environment of finite memory enables a quantum system with a single atom to mimic collective effects such as superradiance [8], which is still a topic of intense investigation [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Decoherence by spontaneous emission: A single-atom analog of superradiance

2016

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We show that the decoherence of the atomic center-of-mass induced by spontaneous emission involves interferences corresponding to a single-atom analog of superradiance. We use a decomposition of the stationary decoherence rate as a a sum of local and nonlocal contributions obtained to second order in the interaction by the influence functional method. These terms are respectively related to the strength of the coupling between system and environment, and to the quality of the information about the system leaking into the environment. While the local contribution always yields a positive decoherence rate, the nonlocal one may lead to recoherence when only partial information about the system is obtained from the disturbed environment. The nonlocal contribution contains interferences between different quantum amplitudes leading to oscillations of the decoherence rate reminiscent of superradiance. These concepts, illustrated here in the framework of atom interferometry within a trap, may be applied to a variety of quantum systems.

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Single-photon superradiance in cold atoms

Cited by 52 publications

References 26 publications

Enhanced Quantum Interface with Collective Ion-Cavity Coupling

Enhanced Quantum Interface with Collective Ion-Cavity Coupling

Collective effects in the radiation pressure force

Decoherence by spontaneous emission: A single-atom analog of superradiance

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