Entanglement between two atoms in a damping Jaynes-Cummings model

TL;DR

This paper studies how atomic decay and detuning affect entanglement dynamics in a damping Jaynes-Cummings model, revealing conditions to prolong entanglement and avoid sudden death effects.

Contribution

It provides new insights into controlling entanglement decay by adjusting decay coefficients and detuning in a damping Jaynes-Cummings system.

Findings

Larger decay coefficients lead to faster entanglement decay.

Detuning increases the long-term average entanglement.

Sudden death of entanglement can be avoided by increasing detuning or decay coefficient.

Abstract

The entanglement between two atoms in a damping Jaynes-Cummings model is investigated with different decay coefficients of the atoms from the upper level to other levels under detuning between the atomic frequency and the quantized light field frequency. The results indicate that the larger the decay coefficient is, the more quickly the entanglement decays. The detuning enhances the entanglement's average value at long times. More importantly, the results show that the so-called sudden death effect can be avoided by enhancing the detuning or the decay coefficient.