Effect of the F\"orster Interaction and the Pulsed Pumping on the Quantum Correlations of a Two Quantum Dot-Microcavity System in the Strong Coupling Regime

TL;DR

This paper theoretically investigates how F"oster interaction and pulsed laser pumping influence quantum correlations in a strongly coupled two quantum dot-microcavity system, revealing that quantum discord persists beyond entanglement.

Contribution

It introduces a detailed analysis of quantum correlations under F"oster interaction and pulsed excitation, highlighting the dominance of quantum discord over entanglement in the system.

Findings

Concurrence exceeds entanglement of formation significantly.

Quantum discord remains robust even when entanglement vanishes.

F"oster interaction enhances quantum discord in the system.

Abstract

The quantum correlations of a system of two quantum dots with F\"oster interaction ({\Gamma}) in a microcavity with strongly coupled dissipation and a single mode of the electromagnetic field and driven by a laser pulse were studied theoretically, using the formalism of the master equation in Lindbland form. The energy eigenvalues of the system were studied as a function of detuning for the first and second excitation varieties. Concurrence (CC), formation entanglement (EoF),mutual information (I) and quantum discord (Q) are studied as a function of time considering different values of F\"oster coupling, varying the pump times of the simulated laser pulse and pulse intensity. We found a discrepancy between EoF and CC as entanglement quantifiers, noting that concurrence reaches much higher values than EoF; so concurrence can indicate results that are well above the EoF. The presence of the F\"oster interaction favors that the quantum discord is the dominant correlation in the system, which indicates that the system maintains quantum correlations even when the entanglement of the system has disappeared, but that it is affected by the increase in the laser pump time