Squeezing in the Thermal Jaynes-Cummings Model

Abstract

W e have studied the influence of thermal photons on the symmetry between the field and atomic squeezing (SFAS) exposed in the resonant vacuum-field Jaynes-Cummings model with an initially coherent atom. W e have shown that when the number of thermal photons ( N a u ) is less than 0.01, the SFAS is not sensitive to the presence o f thermal photons; when N,, 2 0.01, the broken SFAS can be seen; when N,, 2 0.1, the squeezed atom cannot radiate a squeezed field any longer. Also. we have discussed the possibility of detection of the boken symmetry in superconducting maser cavity.

Entropy squeezing and atomic inversion in the k -photon Jaynes—Cummings model in the presence of the Stark shift and a Kerr medium: A full nonlinear approach

“…So we neglect the terms corresponding to nonconserving energy (in the rotating wave approximation). Under this condition, equations in (10) change to…”

“…[1] Many interesting physical features have been studied with this model. Some examples include atomic inversion, [2] collapse and revival, [3,4] entanglement, [5][6][7] sub-Poissonian statistics, [8,9] quadrature squeezing [10] and entropy squeezing. [11,12] Many researches in this field are based on the linear interaction between atom and field, i.e., the atomfield coupling is assumed to be constant throughout the evolution of the whole system.…”