Optimizing photon indistinguishability in the emission from incoherently-excited semiconductor quantum dots

TL;DR

This paper investigates how to optimize photon indistinguishability in semiconductor quantum dot emitters by analyzing the relationship between indistinguishability and collection efficiency, providing guidelines for device improvement.

Contribution

It offers a theoretical framework linking photon indistinguishability and collection efficiency, guiding the optimization of quantum dot single-photon sources.

Findings

Identifies relations between indistinguishability and collection efficiency

Highlights key parameters for device optimization

Provides general guidelines for improving quantum dot emitters

Abstract

Most optical quantum devices require deterministic single-photon emitters. Schemes so far demonstrated in the solid state imply an energy relaxation which tends to spoil the coherent nature of the time evolution, and with it the photon indistinguishability. We focus our theoretical investigation on semiconductor quantum dots embedded in microcavities. Simple and general relations are identified between the photon indistinguishability and the collection efficiency. The identification of the key parameters and of their interplay provides clear indications for the device optimization.