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Journal of Hefei University of Technology

Atomic dipole squeezing effects in the field interacting with a moving Ξ-type three-level atom

Yang Ming

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

The atomic dipole squeezing effects in the system of the binomial state field interacting with a moving Ξ-type three-level atom are studied.The influences of the optical field parameter,the field-mode speed,the η parameter,and the optical field and atomic coupling coefficient on the atomic dipole squeezing effects are analyzed.The results indicate that the influence of the optical field and atomic coupling coefficient on the atomic dipole squeezing is not noticeable.When four parameters change,periodic compression of the atomic dipole appears.As the field-mode speed parameter p≥9.3,the atom dipole presents complete compression periodically.As the η paramter changes,the atomic dipole experiences three changes:starting from without changes to periodic changes,and then to without changes.

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Journal of Hefei University of Technology•Jan 1, 2006•0 citations
The atomic dipole squeezing effects in the system of the binomial state field interacting with a moving Ξ-type three-level atom are studied.The influences of the optical field parameter,the field-mode speed,the η parameter,and the optical field and atomic coupling coefficient on the atomic dipole squeezing effects are analyzed.The results indicate that the influence of the optical field and atomic coupling coefficient on the atomic dipole squeezing is not noticeable.When four parameters change,periodic compression of the atomic dipole appears.As the field-mode speed parameter p≥9.3,the atom dipole presents complete compression periodically.As the η paramter changes,the atomic dipole experiences three changes:starting from without changes to periodic changes,and then to without changes.
By means of solving Schrdinger equation and numerical calculations,the dynamic behavior of the interaction between the single mode squeezed vacuum field and a moving Ξtype three-level atom has been studied,and the relations between the radiation squeezing effects and the coupling parameter of the system are discussed.The results of numerical calculations indicate that,the squeezed property of the radiation field is determined by the speed of the atom,and the squeezed property of the radiation field can be obviously influenced by the squeezing parameter of the system when the Ξ-type three-level atom moves with great speed.the radiation field can show complete squeezing effects when the system parameters are selected appropriately.
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 atomic dipole squeezing effects in the system of a two-mode entangled states interacting with a Σ-type three-level atom were studied.We analyzed the effects of the degree of entanglement of the two-mode entangled coherent states,the ground state probability amplitude of atomic initial state,the detuning,and the mean photon numbers on the atomic dipole squeezing effects.The results indicate that the influence of the(degree) of entanglement of the two-mode entangled coherent states on the atomic dipole squeezing effects isn't noticeable.While the atomic initial state is in the ground state or excited state,the atomic dipole squeezing effects can not occur.While the probability of atomic initial state in ground state is equal to that in the excited state,the atomic dipole squeezing reaches its maximum.The enhancing of the detuning results in the increase of the frequency of atomic dipole squeezing.When the mean photon number of mode 1 remains unchanged and the mean photon number of mode 2 increases,the depth of atomic dipole squeezing decreases and the(frequency) of atomic dipole squeezing doesn't change.
The atomic dipole amplitude-squared squeezing effects of a Ξ-type three-level atom interacting with two-mode entangled coherent states are investigated.The effects of the degree of entanglement of the two-mode entangled coherent states,the ground state probability amplitude of the atomic initial state,the detuning,the mean photon number and the atom-field coupling constant on the atomic dipole amplitude-squared squeezing are analyzed.The results indicate that the light squeezing effects depend on the degree of entanglement of the two-mode entangled coherent optical fields,the detuning,the mean photon numbers,the atom-field coupling constant and the atomic initial state.