Quantum correlations beyond entanglement in a double-cavity opto-mechanical system

TL;DR

This paper explores the robustness and control of quantum correlations beyond entanglement in a double-cavity opto-mechanical system, analyzing how environmental factors influence these correlations.

Contribution

It provides analytical formulas for the covariance matrix and investigates the dynamics of quantum correlations under different environmental parameters.

Findings

Quantum correlations can be enhanced or suppressed by tuning system parameters.

Analytical expressions for the covariance matrix of the system are derived.

Quantum correlations are sensitive to temperature, squeezing, and cooperativity.

Abstract

In this paper we investigate the robustness of the quantum correlations against the environment effects in various opto-mechanical bipartite systems. For two spatially separated opto-mechanical cavities, we give analytical formula for the global covariance matrix involving two mechanical modes and two optical modes. The logarithmic negativity as an indicator of the degree of entanglement and the Gaussian quantum discord which is a witness of quantumness of correlations are used as quantifiers to evaluate the different pairwise quantum correlations in the whole system. The evolution of the quantum correlations existing in this opto-mechanical system are analyzed in terms of the thermal bath temperature, squeezing parameter and the opto-mechanical cooperativity. We find that with desirable choice of these parameters, it is possible either enhance or annihilate the quantum correlations in the system. Various scenarios are discussed in detail.