Dynamical Casimir Effect in dissipative media: When is the final state non-separable ?

TL;DR

This paper investigates how dissipation affects the creation and entanglement of correlated quasi-particles in media undergoing sudden changes, revealing regimes where the final state remains non-separable.

Contribution

It provides a detailed analysis of dissipation's impact on the spectrum and correlations, identifying conditions for non-separable final states in dissipative media.

Findings

Dissipation influences the coherence and entanglement of quasi-particle pairs.

The competition between jump intensity and temperature determines the non-separability regime.

Dissipation modifies the balance between stimulated and spontaneous emission effects.

Abstract

We study the consequences of dissipation in homogeneous media when the system is subject to a sudden change, thereby producing pairs of correlated quasi-particles with opposite momenta. We compute both the modifications of the spectrum, and those of the correlations. In particular, we compute the final coherence level, and identify the regimes where the state is non-separable. To isolate the role of dissipation, we first consider dispersive media and study the competition between the intensity of the jump which induces some coherence, and the temperature which reduces it. The contributions of stimulated and spontaneous emission are clearly identified. We then study how dissipation modifies this competition.