Entanglement evolution of a two-qubit system with decay beyond rotating-wave approximation

TL;DR

This paper investigates how entanglement between two atoms evolves over time when coupled to a cavity, emphasizing the significant impact of counter-rotating terms beyond the rotating-wave approximation, including phenomena like sudden death and birth of entanglement.

Contribution

It introduces a non-perturbative quantum master equation approach to analyze entanglement dynamics beyond the rotating-wave approximation, highlighting the effects of counter-rotating terms.

Findings

Counter-rotating terms significantly affect entanglement dynamics.

Entanglement sudden death and birth are observed.

Entanglement evolution is influenced by decay and non-perturbative effects.

Abstract

Two noninteracting atoms, initially entangled in Bell states, are coupled to a one-mode cavity. Based on the reduced non-perturbative quantum master equation, the entanglement evolution of the two atoms with decay is investigated beyond rotating-wave approximation. It is shown that the counter-rotating wave terms have great influence on the disentanglement behavior. The phenomenon of entanglement sudden death and entanglement sudden birth will occur.