Nonclassical effects in optomechanics: Dynamics and collapse of entanglement

TL;DR

This paper explores nonclassical phenomena in a tripartite cavity optomechanical system, focusing on entanglement dynamics, nonclassicality measures, and the effects of initial states and system parameters.

Contribution

It introduces a detailed analysis of entanglement collapse, nonclassicality assessment via optical tomograms, and the influence of intensity-dependent coupling in a cavity optomechanical setup.

Findings

Atom's von Neumann entropy collapses during evolution

Nonclassicality assessed through Mandel Q and Wigner functions

Optical tomograms used to quantify squeezing properties

Abstract

We have investigated a wide range of nonclassical behavior exhibited by a tripartite cavity optomechanical system comprising a two-level atom placed inside a Fabry-P\'{e}rot type optical cavity with a vibrating mirror attached to one end. We have shown that the atom's subsystem von Neumann entropy collapses to its maximum allowed value over a significant time interval during dynamical evolution. This feature is sensitive to the nature of the initial state, the specific form of intensity-dependent tripartite coupling, and system parameters. The extent of nonclassicality of the field is assessed through the Mandel Q parameter and Wigner function. Both entropic and quadrature squeezing properties of the field are quantified directly from optical tomograms, thereby avoiding tedious state reconstruction procedures.