Virtual excitations and quantum correlations in ultra-strongly coupled harmonic oscillators under intrinsic decoherence

TL;DR

This paper investigates how intrinsic decoherence affects quantum correlations and virtual excitations in ultra-strongly coupled harmonic oscillators, revealing conditions for entanglement revival and correlation amplification.

Contribution

It provides an exact solution to the Milburn master equation for coupled oscillators and uncovers the role of virtual excitations in maintaining quantum correlations under decoherence.

Findings

Quantum correlations exhibit damped oscillations.

Entanglement and steering reemerge with ultra-strong coupling and anisotropy.

Virtual excitations are essential for sustaining quantum correlations.

Abstract

We study the intrinsic decoherence of coupled harmonic oscillators. The Milburn master equation is solved exactly, and the dynamics of virtual ground state excitations are investigated. The interaction of quantum correlations and virtual excitation was then studied. The following is a summary of our major findings. (i) The damped oscillatory profile of all three quantities is the same. (ii) Ultra-strong coupling combined with huge anisotropy values results in the reemergence of entanglement and steering. (iii) To sustain entanglement and steering, virtual excitations are required. (iv) The quantum correlations are amplified in the quantum synchronous regime. (v) Ultra-strong couplings cause inherent decoherence to be avoided.