Nonclassical Correlation of Polarization Entangled Photons in a Biexciton-Exciton Cascade

TL;DR

This paper presents a theoretical model analyzing how polarization entangled photons emitted from a biexciton-exciton cascade are affected by dephasing and energy splitting, aligning with experimental observations.

Contribution

The paper introduces a new theoretical framework for studying polarization correlations in biexciton-exciton cascades, including effects of dephasing and energy splitting.

Findings

Correlation degree is influenced by dephasing and energy splitting.

Model agrees with recent experimental observations.

Framework can be extended to coupled quantum dot systems.

Abstract

We develop a theoretical model to study the Intensity-Intensity correlation of polarization entangled photons emitted in a biexciton-exciton cascade. We calculate the degree of correlation and show how polarization correlation are affected by the presence of dephasing and energy level splitting of the excitonic states. Our theoretical calculations are in agreement with the recent observation of polarization dependent Intensity-Intensity correlations from a single semiconductor quantum dot [R. M. Stevenson et. al., Nature 439, 179 (2006)] . Our model can be extended to study polarization entangled photon emission in coupled quantum dot systems.