Correlated photon-pair emission from pumped-pulsed quantum dots embedded in a microcavity

TL;DR

This paper theoretically explores how a quantum dot in a microcavity, excited by pulsed pumping, can emit polarization-correlated photon pairs, demonstrating potential for quantum light sources.

Contribution

It introduces a theoretical model showing correlated photon-pair emission from a pumped quantum dot in a microcavity with off-resonant exciton and biexciton coupling.

Findings

System acts as a good emitter of polarization-correlated photon pairs

Rich behaviors observed in second-order correlation functions

Time-averaged quantities match experimental accessibility

Abstract

We theoretically investigate the optical response of a quantum dot, embedded in a microcavity and incoherently excited by pulsed pumping. The exciton and biexciton transition are off-resonantly coupled with the left- and right-polarized mode of the cavity, while the two-photon resonance condition is fulfilled. Rich behaviours are shown to occur in the time dependence of the second-order correlation functions which refer to counter-polarized photons. The corresponding time-averaged quantities, which are accessible to experiments, confirm that such a dot-cavity system behaves as a good emitter of single, polarization-correlated photon pairs.