Berry Phase in a Two-atom Jaynes-Cummings Model with Kerr Medium

TL;DR

This paper investigates the Berry phase and ground state entropy in a two-atom Jaynes-Cummings model with Kerr medium, revealing correlations useful for entanglement detection in cavity QED systems.

Contribution

It introduces the analysis of Berry phase and entropy in a generalized two-atom JCM with Kerr medium, highlighting their interrelations and potential for entanglement detection.

Findings

Existence of a curve in the parameter space where energy, Berry phase, and entropy reach special values.

Correlation between Berry phase and entropy suggests a method for entanglement detection.

Ground state properties depend on photon number and system parameters.

Abstract

he Jaynes-Cummings model (JCM) is an very important model for describing interaction between quantized electromagnetic fields and atoms in cavity quantum electrodynamics (QED). This model is generalized in many different direction since it predicts many novel quantum effects that can be verified by modern physics experimental technologies. In this paper, the Berry phase and entropy of the ground state for arbitrary photon number $n$ of a two-atom Jaynes-Cummings model with Kerr like medium are investigated. It is found that there are some correspondence between their images, especially the existence of a curve in the $\Delta-\varepsilon$ plane along which the energy, Berry phase and entropy all reach their special values. So it is available for detecting entanglement by applying Berry phase.