Effect of the Förster interaction and the pulsed pumping on the quantum correlations of a two quantum dot-microcavity system in the strong coupling regime

Abstract

The quantum correlations of a system of two quantum dots with Föster 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 ($C$), formation entanglement ($EoF$), mutual information ($I$) and quantum discord ($Q$) are studied as a function of time considering different values of Föster coupling, varying the pump times of the simulated laser pulse and pulse intensity. We found a discrepancy between $EoF$ and $C$ 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 Föster 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.