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Journal of Atomic and Molecular Physics

Nonclassial properties of an initial two-mode squeezed vacuum field Interacting with a cascade three-level atom via intensity-dependent coupling

Tian Yong

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

The properties of squeezing and quantum statistics of an initial two-mode squeezed vacuum field interacting with a cascade three-level atom via intensity-dependent coupling are studied by means of fully quantum theory.The influence of squeezing parameters of initial field and single photon frequency detuning of atom-field on the nonclassial properties of light are discussed.

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The properties of squeezing and quantum statistics of an initial two-mode squeezed vacuum field interacting with a cascade three-level atom via intensity-dependent coupling are studied by means of fully quantum theory.The influence of squeezing parameters of initial field and single photon frequency detuning of atom-field on the nonclassial properties of light are discussed.
The squeezing properties of light field interacting with the A-type three level atom via intensity-dependent coupling are studied and the influences of detuning between the atomic transition frequency and the light frequency in single-photon process and the initial squeezing of light on the light squeezing are discussed emphatically. The results show that both the detuning and the initial squeezing of light strongly influence the squeezing of field. The light squeezing remains continuous if the detuning is big enough, but if the detuning is little the light field will be squeezed periodically. The bigger the initial squeezing factor of light is, the deeper the light squeezing is.
The influences of detuning δ and initial squeezed light_field factor r on the light squeezing and Cauchy_Schwartz inequality in the system of two_mode squeezing vacuum field interacting non_resonantly with a Λ_type three_level atom is investigated.The results show that the light field is squeezed regularly. The light squeezing level is evidently relative to r and δ. With the increase r, the nonclassical correlation properties between the two mode cavities get steady. The detuning makes the nonclassical correlation degree steady.
Squeezing and entanglement of a two-mode cascade laser, produced by a three-level atom which is initially prepared by a coherent superposition of the top and bottom levels then injected into a cavity coupled to a two-mode squeezed vacuum reservoir is discussed. I obtain stochastic differential equations associated with the normal ordering using the pertinent master equation. Making use of the solutions of the resulting differential equations, we determined the mean photon number for the cavity mode and their correlation, EPR variables, smallest eigenvalue of the symplectic matrix, intensity difference fluctuation, and photon number correlation. It is found that the squeezed vacuum reservoir increases the degree of the statistical and nonclassical features of light produced by the system. Furthermore, using the criteria developed by logarithm negativity and Hillery-Zubairy criteria, the quantum entanglement of the cavity mode is quantified. It is found that the degree of the entanglement for the system under consideration increases with the squeezing parameter of the squeezed vacuum reservoir.
The statistic properties of photon in the non-resonance system of single-model squeezed vacuum field interacting with two coupling atoms via intensity-dependent coupling in Kerr medium are investigated.By using the numerical method,the relations between the statistic properties of photon and the coupling parameter of the system are discussed.The results show that the statistic properties of photon depend on the Kerr effect,the detuning,the dipole-dipole interaction between atoms,the initial squeezed parameter of the light and the atomic initial state.