We investigate the spontaneous emission from an inverted $\mathbsf{Y}$-type atomic system coupled by three coherent fields. We use the Schr\"odinger equation to calculate the probability amplitudes of the wave function of the system and derive an analytical expression of the spontaneous emission spectrum to trace the origin of the spectral features. Quantum interference effects, such as the spectral line narrowing, spectrum splitting, and dark resonance, are observed. The number of spectral components, the spectral linewidth, and relative heights can be very different depending on the physical parameters. A variety of spontaneous emission spectral features can be controlled by the amplitude of the coupling fields and the preparation of the initial quantum state of the atom. We propose an ultracold atomic $^{87}\text{R}\text{b}$ system for experimental observation.We investigate the spontaneous emission from an inverted $\mathbsf{Y}$-type atomic system coupled by three coherent fields. We use the Schr\"odinger equation to calculate the probability amplitudes of the wave function of the system and derive an analytical expression of the spontaneous emission spectrum to trace the origin of the spectral features. Quantum interference effects, such as the spectral line narrowing, spectrum splitting, and dark resonance, are observed. The number of spectral components, the spectral linewidth, and relative heights can be very different depending on the physical parameters. A variety of spontaneous emission spectral features can be controlled by the amplitude of the coupling fields and the preparation of the initial quantum state of the atom. We propose an ultracold atomic $^{87}\text{R}\text{b}$ system for experimental observation.

arXiv:0909.2081Physical Review AOct 21, 20096 citations

Interaction of Coherent Radiation with Atoms

A. D. Gazazyan

Journal of Experimental and Theoretical PhysicsJun 1, 19671 citation

Resonance flourescence in atomic coherent systems: spectral features

S. N. Sandhya

We study resonance flourescence in a four level ladder system and illustrate some novel features due to quantum interference and atomic coherence effects. We find that under three photon resonant conditions, in some region of the parameter space of the rabi frequencies $Ω_1,Ω_2,Ω_3$ , emission is dominantly by the level 4 at the line center even though there is an almost equal distribution of populations in all the levels. As one increases $Ω_3$ with $Ω_1 and Ω_2$ held fixed, the four level system 'dynamically collapses' to a two level system. The steady state populations and the the resonance flourescence from all the levels provide adequate evidence to this effect.We study resonance flourescence in a four level ladder system and illustrate some novel features due to quantum interference and atomic coherence effects. We find that under three photon resonant conditions, in some region of the parameter space of the rabi frequencies $Ω_1,Ω_2,Ω_3$, emission is dominantly by the level 4 at the line center even though there is an almost equal distribution of populations in all the levels. As one increases $Ω_3$ with $Ω_1 and Ω_2$ held fixed, the four level system 'dynamically collapses' to a two level system. The steady state populations and the the resonance flourescence from all the levels provide adequate evidence to this effect.

arXiv:quant-ph/9905098May 28, 19990 citations

Interference phenomena in atomic scattering

Evgeniĭ E. Nikitin, M. Ya. Ovchinnikova

Uspekhi Fizicheskih NaukJan 1, 197120 citations

Quantum Interferences in Cooperative Dicke Emission from Spatial Variation of the Laser Phase

Sumanta Das, G. S. Agarwal, Marlan O. Scully

We report the generation of a new quantum interference effect in spontaneous emission from a resonantly driven system of two identical two-level atoms due to the spatial variation of the laser phase at the positions of the atoms. This interference affects significantly the spectral features of the emitted radiation and the quantum entanglement in the system. The interference leads to dynamic coupling of the populations and coherences in a basis, determined by the laser phase and represents a kind of vacuum mediated superexchange between the symmetric and antisymmetric states.We report the generation of a new quantum interference effect in spontaneous emission from a resonantly driven system of two identical two-level atoms due to the spatial variation of the laser phase at the positions of the atoms. This interference affects significantly the spectral features of the emitted radiation and the quantum entanglement in the system. The interference leads to dynamic coupling of the populations and coherences in a basis, determined by the laser phase and represents a kind of vacuum mediated superexchange between the symmetric and antisymmetric states.

arXiv:0808.0178Physical Review LettersOct 6, 200883 citations

^{87}\text{R}\text{b}

system for experimental observation.

Ω_1,Ω_2,Ω_3

, emission is dominantly by the level 4 at the line center even though there is an almost equal distribution of populations in all the levels. As one increases

Ω_3

with

Ω_1 and Ω_2

held fixed, the four level system 'dynamically collapses' to a two level system. The steady state populations and the the resonance flourescence from all the levels provide adequate evidence to this effect.