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

Quantum beats in two-photon resonance fluorescence

Constantine Mavroyannis

Physica A Statistical Mechanics and its ApplicationsJun 1, 19806 citations

The antibunching and the quantum beat of the interaction of a cascade three-level atom with two radiation fields

Songen Sun

The time evolution of the antibunching and quantum beat is studied by considering the resonant interaction of two radiation fields with a cascade three-level atom. It is found that different initial atomic states and different ratios of the average photon number of two radiation fields as well as the different coupling coefficients have a remarkable influence on the antibunching and quantum beat of two radiation fields. By numerical summation and a number of figures, it is interesting to note that under certain conditions, some strange behaviour occurs in this cascade three-level atomic system. The explanation of these strange behaviours is given.The time evolution of the antibunching and quantum beat is studied by considering the resonant interaction of two radiation fields with a cascade three-level atom. It is found that different initial atomic states and different ratios of the average photon number of two radiation fields as well as the different coupling coefficients have a remarkable influence on the antibunching and quantum beat of two radiation fields. By numerical summation and a number of figures, it is interesting to note that under certain conditions, some strange behaviour occurs in this cascade three-level atomic system. The explanation of these strange behaviours is given.

Journal of Physics B Atomic Molecular and Optical PhysicsJul 28, 19901 citation

Quantum beats in fluorescence for multi-level atomic system

Ryuzi Yano, Hiroyuki Shinojima, K. Nakagawa

Applied Surface ScienceApr 22, 20092 citations

Photon-echo quantum beats in a magnetic field

A. I. Alekseev, Ashat M. Basharov, V N Beloborodov

A theoretical investigation is made of the specific polarisation rotation and the intensity quantum beats of the three-level stimulated photon echoes from a gas medium in a longitudinal magnetic field. These effects are found to be due to the precession of the atomic polarisation and magnetic moment. An interesting structure of the photon echoes in a strong magnetic field (which is also referred to as quantum beats) was discovered. An analysis of various types of photon-echo quantum beats in a magnetic field is given. It is shown that the use of the optimum polarisations of the exciting pulses gives rise to photon-echo quantum beats of a simple form. The results obtained allow the g factors and the total angular momenta of resonant atomic levels to be experimentally determined.A theoretical investigation is made of the specific polarisation rotation and the intensity quantum beats of the three-level stimulated photon echoes from a gas medium in a longitudinal magnetic field. These effects are found to be due to the precession of the atomic polarisation and magnetic moment. An interesting structure of the photon echoes in a strong magnetic field (which is also referred to as quantum beats) was discovered. An analysis of various types of photon-echo quantum beats in a magnetic field is given. It is shown that the use of the optimum polarisations of the exciting pulses gives rise to photon-echo quantum beats of a simple form. The results obtained allow the g factors and the total angular momenta of resonant atomic levels to be experimentally determined.

Journal of Physics B Atomic and Molecular PhysicsDec 28, 19835 citations

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.