Entanglement of fields in coupled-cavities: effects of pumping and fluctuations

TL;DR

This paper investigates how external pumping and fluctuations influence the entanglement between two coupled cavities, highlighting the importance of cavity coupling in controlling quantum correlations in continuous variable systems.

Contribution

It introduces a detailed analysis of bipartite entanglement dynamics in coupled cavities with external quadratic pumping, considering pump fluctuations and their effects.

Findings

Pump fluctuations significantly affect entanglement levels.

Tailoring cavity coupling can optimize entanglement.

External pumping can enhance or diminish quantum correlations.

Abstract

A system of two coupled cavities is studied in the context of bipartite, continuous variable entanglement. One of the cavities is pumped by an external classical source that is coupled quadratically, to the cavity field. Dynamics of entanglement, quantified by covariance measure [Dodonov {\it et al}, Phys. Lett A {\bf 296}, (2002) 73], in the presence of cavity-cavity coupling and external pumping is investigated. The importance of tailoring the coupling between the cavities is brought out by studying the effects of pump fluctuations on the entanglement.