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Journal of Guizhou Normal University

Dipole squeezing of a Λ-type three-level atom interacting with two-mode entangled coherent field

LU Dao-ming

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

By means of numerical calculations,the dipole squeezing of a Λ-type three-level atom interacting with two-mode entangled coherent states is investigated.The influences of the degree of entanglement of two-mode entangled coherent optics field and mean photon numbers of two-mode optics field on dipole squeezing of a Λ-type three-level atom are discussed.The results show that squeezing effect weakens with increase of degree of entanglement of two-mode entangled coherent optics field and with increasing of mean photon numbers of two-mode entangled coherent optics field.

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Chinese journal of atomic and molecular physics•Jan 1, 2004•0 citations
By means of numerical calculations,the dipole squeezing of a Λ-type three-level atom interacting with two-mode entangled coherent states is investigated.The influences of the degree of entanglement of two-mode entangled coherent optics field and mean photon numbers of two-mode optics field on dipole squeezing of a Λ-type three-level atom are discussed.The results show that squeezing effect weakens with increase of degree of entanglement of two-mode entangled coherent optics field and with increasing of mean photon numbers of two-mode entangled coherent optics field.
By means of numerical calculations,squeezing effect of the field in the system of two-mode entangled coherent states interacting with a Λ-type three-level atom is investigated.The influences of the degree of entanglement of two-mode entangled coherent state optics field and mean photon numbers of two-mode optics field on squeezing effect are discussed.The results show that squeezing effect strengthens with increasing of the the degree of entanglement of two-mode entangled coherent state optics field and weakens with increasing of mean photon numbers of two-mode entangled coherent state optics field.
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.
Considering two Λ-type three-level atoms initially in the entangled state,one atom is poured into the cavity and interacts with a two-mode cavity.The dipole squeezing of an atom inside the cavity are investigated.The influences of the selective atomic measurement and the intensity of the coherent field which interacts with atom on dipole squeezing of an atom inside the cavity are discussed.The result obtained by numerical calculations shows that the dipole squeezing of an atom inside the cavity can be strengthened through selective atomic measurement for atom outside of the cavity.
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.