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Acta Sinica Quantum Optica

Properties of Atom Dipole Dqueezing in Time-Dependent and Intensity-Dependent Coupling J-C Model

Hong‐Guang Piao

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

The properties of the atomic dipole squeezing in the time-dependent and intensity-dependent J-C model are investigated.The effect of pulse width and cavity field intensity on the atomic dipole squeezing is discussed when the coupling of atomic and cavity field is time-dependent.The results show that the time-evolution of the atomic dipole squeezing in this model is obviously different from other intensity-dependent models,and that the degree atomic dipole squeezing can be controlled effectively by regulating the pulse widths.

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Journal of Atomic and Molecular Physics•Jan 1, 2006•0 citations
The properties of the atomic dipole squeezing in the time-dependent and intensity-dependent J-C model are investigated.The effect of pulse width and cavity field intensity on the atomic dipole squeezing is discussed when the coupling of atomic and cavity field is time-dependent.The results show that the time-evolution of the atomic dipole squeezing in this model is obviously different from other intensity-dependent models,and that the degree atomic dipole squeezing can be controlled effectively by regulating the pulse widths.
The effects of bunching and antibunching of light field in the time-dependent and intensity-dependent J-C model are investigated.The effect of different pulse widths and light field intensity on bunching and antibunching effects of light field is discussed when the coupling of atom and light field is time-dependent.The results show that the time-evolution of second-order correlation function in this model is different from other intensity-dependent models,and that we can control the degree of bunching and antibunching effectively by controling the pulse width.
The time evolution of atomic dipole squeezing in the intensity-dependent coupling interaction between squeezing vacuum state and V-type three-level atom is studied using the quantum theory.The effects of the squeezing degree r of initial field and the coupling constant g are discussed by the method of the numerical calculations.The result shows that when r increases,the times of atomic dipole squeezing decrease gradually and vanish with the time evolution,but the maximum of degree has no evident change;the times of atomic dipole squeezing increase,while the duration is shortened with the increase of g.
The atomic dipole squeezing is a very important phenomenon in the interaction between an atom and an optical field, but the atomic dipole squeezing of a three-level atom with an intensity-dependent coupling is seldom reported. By using a full quantum theory, We investigate the time-evolution properties of the atomic dipole squeezing of the degenerate quantum-beat three-level atom intensity-dependently interacting with a single-mode coherent field, and explore effects of splitting of the lower energy levels of the atom, the field intensity and the initial atomic coherence on the atomic dipole squeezing. Our results show that, when the two lower levels of the atom is degenerate, dipole squeezing parameters evolve periodically with time, and the splitting of the lower levels destroy this periodicity and reduce the amount of dipole squeezing. The relationship between the amount of dipole squeezing and the initial coherent field intensity is not monotonous. The initial atomic coherence has a great influence on the dipole squeezing.
The time evolution of atomic occupancy for the system of squeezed vacuum field interacting with two coupling atoms via intensity-dependent coupling in two-photon transition are investigated. The influences of the atomic initial state, the interaction between atoms and the initial squeezed parameter of field on the atomic occupancy are discussed. The results show that periodical collapse-revival phenomenon of the time evolution of atomic occupancy appears, which is caused by the influence of the dipole-dipole interaction between atoms. The periods of the collapse-revival shortens till the collapse-revival disappears while increasing the interaction between atoms. The amplitude of oscillations decreases in increasing the initial squeezed parameter of field.
The time evolution of atomic dipole squeezing in the system of single-mode field interacting with V-type three-level atom via intensity-dependent coupling in Kerr medium is studied by means of the quantum theory.The effects of the coupling constant χ and the detuning Ω on the dipole squeezing are discussed by the method of the numerical calculations.The results show that Kerr effect has decreased the atomic dipole squeezing in various degrees and proper detuning Ω is propitious to atomic dipole squeezing.