Entropy squeezing of a Jaynes–Cummings atom with the Glauber–Lachs state

Abstract

In this paper, we investigate the entropy squeezing of a two-level atom interacting with a quantum field prepared initially in the Glauber–Lachs state by using the Jaynes–Cummings model. We explore the effects of increasing the intensity of the thermal field over a fixed intensity of the coherent field on the entropy squeezing of the atom. We show that increasing the number of thermal photons in the coherent field has a destructive effect on the entropy squeezing of the atom.

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

“…This enables one to analyze interesting properties such as atomic inversion and entropy squeezing, which will be done in the following sections. It can clearly be seen that, setting f (n) = 1 in the relations (13), (14) recovers the results of Ref. [34].…”

“…Phoenix and Knight [13] used the JCM and employed a diagonalised reduced density operator to calculate entropy and demonstrated thereby the essential two-state nature of the field. Kayham investigated the entropy squeezing of a two-level atom interacting with a quantum field prepared initially in the Glauber-Lachs state by the standard JCM [14]. Liao et al considered a system of two two-level atoms interacting with a binomial field in an ideal cavity and investigated the time evolution of the single-atom entropy squeezing, atomic inversion and linear entropy of the system [15].…”

“…Kayham investigated the entropy squeezing of a two-level atom interacting with a quantum field prepared initially in the Glauber-Lachs state by using the standard JCM. [14] Liao et al considered a system of two two-level atoms interacting with a binomial field in an ideal cavity and investigated the time evolution of the single-atom entropy squeezing, atomic inversion and linear entropy of the system. [15] Zhang et al discussed the entanglement and the evolution of some of the nonclassicality features of the atomfield system in a standard JCM with squeezed vacuum and coherent state fields as the initial field state.…”

Atomic coherence in the nonresonant Jaynes–Cummings model with thermocoherent field

“…This state describes the pollution of the coherent state by the thermal noise and experimentally has been verified by Arecchi et al [34]. Temporal evolution of different proper ties (such as entropy squeezing, entanglement and population inversion) of a twolevel atom interacting with a quantunm field prepared initially in the Gluber-Lachs (GL) state by using the resonance JCM have been studied in [35][36][37]. Generally, the JCM and its extensions can be solved in the nonresonant case [38][39][40][41].…”

Entropy squeezing of a multi-photon Jaynes-Cummings atom in the presence of noise

“…Accordingly, they proposed a measure of the squeezing of an atom the so-called squeezed in entropy in order to obtain su¢ cient information on atomic squeezing. The entropy squeezing of the atom has been studied extensively [15,16,17,18,19]. These works reveal that the entropy squeezing based on the EUR is more precise than the variance squeezing based on the HUR, as a measure of the atomic squeezing.…”