Far-field resonance fluorescence from a dipole-interacting laser-driven cold atomic gas

Jones, Ryan; Saint, R.; Olmos, Beatriz

doi:10.1088/1361-6455/50/1/014004

Cited by 30 publications

(18 citation statements)

References 51 publications

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“…Solving Eq. (2) for large systems is numerically taxing, although few-atom ensembles already demonstrate manybody effects in their spectra 56 . Semiclassical model.…”

Section: Resultsmentioning

confidence: 99%

Quantum and nonlinear effects in light transmitted through planar atomic arrays

et al. 2020

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Understanding strong cooperative optical responses in dense and cold atomic ensembles is vital for fundamental science and emerging quantum technologies. Methodologies for characterizing light-induced quantum effects in such systems, however, are still lacking. Here we unambiguously identify significant quantum many-body effects, robust to position fluctuations and strong dipole-dipole interactions, in light scattered from planar atomic ensembles by comparing full quantum simulations with a semiclassical model neglecting quantum fluctuations. We find pronounced quantum effects at high atomic densities, light close to saturation intensity, and around subradiant resonances. Such conditions also maximize spin-spin correlations and entanglement between atoms, revealing the microscopic origin of light-induced quantum effects. In several regimes of interest, our approximate model reproduces light transmission remarkably well, permitting analysis of otherwise numerically inaccessible large ensembles, in which we observe many-body analogues of resonance power broadening, vacuum Rabi splitting, and significant suppression in cooperative reflection from atomic arrays.

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“…Solving Eq. (2) for large systems is numerically taxing, although few-atom ensembles already demonstrate manybody effects in their spectra 56 . Semiclassical model.…”

Section: Resultsmentioning

confidence: 99%

Quantum and nonlinear effects in light transmitted through planar atomic arrays

et al. 2020

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“…These methods, whether called classicalelectrodynamics simulations or coupled-dipole simulations, are now a routine theoretical tool [2,4,7,8,[14][15][16][17][18][19][20][21][22][23][24][25][26]. Closely related numerical techniques based on the analysis of the eigenstates of the coupled system of the light and the atoms [15,[27][28][29][30][31][32] or density matrices and quantum trajectories [33][34][35] are also widely used today. Other ideas drawn from the theory of radiative transfer [36,37] and multiple scattering [38,39], enhanced with numerics, also have potential to make inroads into the questions about light propagation in atomic media [40].…”

Section: Introductionmentioning

confidence: 99%

Exact electrodynamics versus standard optics for a slab of cold dense gas

Javanainen

Ruostekoski

et al. 2017

Phys. Rev. A

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We study light propagation through a slab of cold gas using both the standard electrodynamics of polarizable media and massive atom-by-atom simulations of the electrodynamics. The main finding is that the predictions from the two methods may differ qualitatively when the density of the atomic sample ρ and the wave number of resonant light k satisfy ρk −3 1. The reason is that the standard electrodynamics is a mean-field theory, whereas for sufficiently strong light-mediated dipole-dipole interactions the atomic sample becomes strongly correlated. The deviations from mean-field theory appear to scale with the parameter ρk −3 , and we demonstrate noticeable effects already at ρk −3 10 −2 . In dilute gases and in gases with an added inhomogeneous broadening the simulations show shifts of the resonance lines in qualitative agreement with the predicted Lorentz-Lorenz shift and "cooperative Lamb shift," but the quantitative agreement is unsatisfactory. Our interpretation is that the microscopic basis for the local-field corrections in electrodynamics is not fully understood.

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“…Among explanations suggested for the disagreement are the role of the complex internal structure of the atoms, where complicated internal dynamics could take place [29][30][31], and the failure of the low-intensity hypothesis for the driving field : in a dense gas, an atom may be saturated by the intense field radiated by a nearby one. Including the saturation requires a density matrix approach, and numerical simulations in the high intensity regime is challenging as the size of the Hilbert space grows exponentially with the number of atoms [17,18,[32][33][34].…”

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confidence: 99%

Coherent scattering of near-resonant light by a dense, microscopic cloud of cold two-level atoms: Experiment versus theory

et al. 2018

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We measure the coherent scattering of low-intensity, near-resonant light by a cloud of laser-cooled two-level rubidium atoms with a size comparable to the wavelength of light. We isolate a twolevel atomic structure by applying a 300 G magnetic field. We measure both the temporal and the steady-state coherent optical response of the cloud for various detunings of the laser and for atom numbers ranging from 5 to 100. We compare our results to a microscopic coupled-dipole model and to a multi-mode, paraxial Maxwell-Bloch model. In the low-intensity regime, both models are in excellent agreement, thus validating the Maxwell-Bloch model. Comparing to the data, the models are found in very good agreement for relatively low densities (n/k 3 0.1), while significant deviations start to occur at higher density. This disagreement indicates that light scattering in dense, cold atomic ensembles is still not quantitatively understood, even in pristine experimental conditions.

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Far-field resonance fluorescence from a dipole-interacting laser-driven cold atomic gas

Cited by 30 publications

References 51 publications

Quantum and nonlinear effects in light transmitted through planar atomic arrays

Quantum and nonlinear effects in light transmitted through planar atomic arrays

Exact electrodynamics versus standard optics for a slab of cold dense gas

Coherent scattering of near-resonant light by a dense, microscopic cloud of cold two-level atoms: Experiment versus theory

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