Deterministic implementation of a bright, on-demand single photon source with near-unity indistinguishability via quantum dot imaging

TL;DR

This paper presents a deterministic, scalable quantum dot-based single photon source with high efficiency and near-unity indistinguishability, achieved through nanoscale imaging and microcavity engineering.

Contribution

It introduces a novel platform combining quantum dot imaging with pillar microcavities for scalable, high-quality single photon sources.

Findings

Achieved 49% photon extraction efficiency.

Produced photons with 94% indistinguishability.

Demonstrated strong Purcell enhancement.

Abstract

Deterministic techniques enabling the implementation and engineering of bright and coherent solid-state quantum light sources are key for the reliable realization of a next generation of quantum devices. Such a technology, at best, should allow one to significantly scale up the number of implemented devices within a given processing time. In this work, we discuss a possible technology platform for such a scaling procedure, relying on the application of nanoscale quantum dot imaging to the pillar microcavity architecture, which promises to combine very high photon extraction efficiency and indistinguishability. We discuss the alignment technology in detail, and present the optical characterization of a selected device which features a strongly Purcell-enhanced emission output. This device, which yields an extraction efficiency of $\eta=(49\pm4)~\%$, facilitates the emission of photons with $(94\pm2.7)~\%$ indistinguishability.