Entanglement and quantum discord in the cavity QED models

TL;DR

This paper explores quantum correlations like entanglement and discord in cavity QED models, analyzing how initial states and dissipation affect these correlations using master equations and various measures.

Contribution

It provides a detailed analysis of quantum discord dynamics in cavity QED models, incorporating dissipation effects and initial entanglement.

Findings

Quantum discord is sensitive to initial entanglement and dissipation.

Dissipative dynamics significantly influence quantum correlations.

Quantum discord exhibits distinct behavior compared to entanglement in open systems.

Abstract

We investigate the quantum correlation between light and matter in bipartite quantum systems, drawing on the Jaynes-Cummings model and the Tavis-Cummings model, which are well-established in cavity quantum electrodynamics. Through the resolution of the quantum master equation, we can derive the dissipative dynamics in open systems. To assess the extent of quantum correlation, several measures are introduced: von Neumann entropy, concurrence and quantum discord. The effects of initial entanglement and dissipation intensity on quantum discord are carefully examined. Furthermore, we examined the dynamics of quantum discord within the $\rm{OH}^+$ model.