Extraction of coherence times of biexciton and exciton photons emitted by a single resonantly excited quantum dot under controlled dephasing

TL;DR

This paper investigates how temperature affects the coherence times of biexciton and exciton photons emitted from a single quantum dot, providing insights into photon indistinguishability under controlled dephasing conditions.

Contribution

It introduces a method to extract coherence times of quantum dot photons as a function of temperature while maintaining temporal correlations, advancing understanding of photon indistinguishability.

Findings

Coherence times decrease with increasing temperature.

Photon indistinguishability is affected by dephasing and temporal correlations.

Method enables separate analysis of these effects.

Abstract

The visibility of two-photon interference is limited by the indistinguishability of the photons. In the cascaded emission of a three-level system, such as a single quantum dot, the indistinguishability of each photon in the pair is primarily affected by two main factors: the temporal correlation between paired photons and dephasing. Investigating the individual effects of these factors on photon indistinguishability is challenging, as both factors affect it simultaneously. In this study, we investigate the temperature-dependent two-photon interference visibility of the biexciton and exciton photons emitted from a single quantum dot under two-photon resonant excitation, while keeping temporal correlation between the paired photons intact. Finally, we simultaneously extract the coherence times of the biexciton and exciton photons as a function of temperature.