Population-grating transfer in cold cesium atoms

Cardoso, George C.; Carvalho, Vanessa Lôbo de; Vianna, S. S.; Tabosa, J. W. R.

doi:10.1103/physreva.59.1408

Cited by 20 publications

(15 citation statements)

References 22 publications

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“…In this case the maximum diffracted signal is obtained when the reading beam has a circular polarization, either + or − , in which the corresponding generated beam has always a circular polarization orthogonal to that of the reading beam, i.e., either − or + . This is in complete contrast with the case of population grating transfer we have studied previously, where the polarization of the diffracted beam is identical to that of the reading beam [17]. In fact, in Fig.…”

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confidence: 49%

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Observation of spontaneous coherence grating transfer in cold cesium atoms

Barreiro

Tabosa

2005

Phys. Rev. A

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We report on the direct observation of spontaneous coherence grating transfer between different pairs of Zeeman sublevels belonging to different cesium hyperfine states. Coherent Bragg diffraction is employed as a signature of the transfer mechanism; this spectrum shows a subnatural linewidth. Theoretically we model the observed effect using a tensorial density matrix formalism to describe the light interaction with a pair of degenerate two-level systems coupled by spontaneous emission. The possibility of transferring a short-lived atomic coherence into a long-lived one might be of considerable importance for the growing field of quantuminformation processing.Light-induced phase coherence between ground state levels of atomic ensembles is behind the physical origin of many striking phenomena such as coherent population trapping, electromagnetically induced transparency, slow and frozen light, among others [1,2]. On the other hand, the growing field of quantum computation has driven a very strong effort to prepare and control a quantum state of light at the single-photon level [3]. The implementation of any quantum protocol is, however, strongly conditioned on our capability of reversibly storing a quantum state of light in a long-lived atomic coherence and recent works have already demonstrated the realization of some atomic memories [4]. More recently, there has been also a great deal of interest in encoding quantum information into a multidimensional state space where in principle one can perform quantum computation and quantum cryptography more efficiently [5]. In particular, the modes of the electromagnetic field carrying orbital angular momentum (OAM), which are described by Laguerre-Gauss modes, constitute by themselves a multidimensional state space and a number of works have addressed the preparation and manipulation of photons in theses modes [6,7]. In this scenario, storing and manipulating the spatial structure of single photons carrying OAM into atomic coherence is actually an issue of considerable interest. Indeed, as a first step toward this goal, in a previous Letter we have experimentally demonstrated that the spatial phase structure of light beams with OAM can be impressed into a Zeeman coherence [8]. In this article we experimentally demonstrate the transfer of a spatial coherence grating via spontaneous emission between different pairs of Zeeman atomic sublevels, belonging to different hyperfine states of the cesium D 2 line. The possibility of transferring optical information encoded into a short-lived atomic coherence to a long-lived one could represent an important tool for creating auxiliary atomic memories [9]. It should be noted that the present technique could in principle be extended to obtain the transfer of a more complex spatial grating such as, for example, the one associated with light beams carrying OAM. In fact, the transfer of spatial population grating for such a case has already been demonstrated [10]. Although the transfer of excited state multipolar moments has been predicte...

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“…It is worth mentioning that in the experiment of Ref. [17], we could not observe the present effect since the MOT beams and the quadrupole magnetic field were not switched off and the frequencies of the writing beams were scanned simultaneously.…”

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confidence: 84%

Observation of spontaneous coherence grating transfer in cold cesium atoms

Barreiro

Tabosa

2005

Phys. Rev. A

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“…For example, in ref. 2 , 3 diffraction of radiation on electromagnetically induced population gratings was studied experimentally. In ref 4 .…”

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confidence: 99%

Population density gratings induced by few-cycle optical pulses in a resonant medium

Архипов

Пахомов

Архипов

et al. 2017

Sci Rep

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Creation, erasing and ultrafast control of population density gratings using few-cycle optical pulses coherently interacting with resonant medium is discussed. In contrast to the commonly used schemes, here the pulses do not need to overlap in the medium, interaction between the pulses is mediated by excitation of polarization waves. We investigate the details of the dynamics arising in such ultrashort pulse scheme and develop an analytical theory demonstrating the importance of the phase memory effects in the dynamics.

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“…We calculated 2 in Fig.3(c). The k values We would like to point out that the satisfied condition in the presented RBS scheme is different from the phase matching condition in DFWM [17][18][19][20](see Appendix 4 for details). The achieved S/N of the RBS spectra in the experiment are limited by the background electronic noise of the APD detector and the measurement interval (the interval of scanning 15MHz is about 1ms).…”

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confidence: 99%

“…condition is satisfied. In the general FWM scheme[17][18][19][20], the phase matching condition not consistent with the Bragg condition. Further more, we try to understand whether the Bragg scattering in the presented scheme may be interpreted to be a degenerate four-wave mixing (DFWM) process.…”

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High-resolution resonance Bragg-scattering spectroscopy of an atomic transition from a population difference grating in a vapour cell

Wang¹,

Yang²,

Zhang³

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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The laser spectroscopy with a narrow linewidth and high signal to noise ratio (S/N) is very important in the precise measurement of optical frequencies. Here, we present a novel high-resolution backward resonance Bragg-scattering (RBS) spectroscopy from a population difference grating (PDG). The PDG is formed by a standing-wave (SW) pump field in thermal 87 Rb vapor, which periodically modulates the space population distribution of two levels in the 87 Rb D1 line. A probe beam, having the identical frequency and the orthogonal polarization with the SW pump field, is Bragg-scattered by the PDG. Such Bragg-scattered light becomes stronger at an atomic resonance transition, which forms the RBS spectrum with a high S/N and sub-natural linewidth. Using the scheme of the coherent superposition of the individual Rayleigh-scattered light emitted from the atomic dipole oscillators on the PDG, the experimentally observed RBS spectroscopy is theoretically explained.

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Population-grating transfer in cold cesium atoms

Cited by 20 publications

References 22 publications

Observation of spontaneous coherence grating transfer in cold cesium atoms

Observation of spontaneous coherence grating transfer in cold cesium atoms

Population density gratings induced by few-cycle optical pulses in a resonant medium

High-resolution resonance Bragg-scattering spectroscopy of an atomic transition from a population difference grating in a vapour cell

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