Highly indistinguishable on-demand resonance fluorescence photons from a deterministic quantum dot micropillar device with 75 $\%$ extraction efficiency

TL;DR

This paper demonstrates a highly efficient, bright, and coherent single-photon source from a quantum dot in a micropillar cavity, achieving near-perfect purity and high indistinguishability, advancing quantum network technology.

Contribution

It reports the first deterministic quantum dot micropillar device with 75% photon extraction efficiency, combining brightness, coherence, and indistinguishability in a scalable solid-state source.

Findings

Device efficiency of 74% for single-photon emission

Photon purity with g^{(2)}(0)=0.0092

Two-photon wave packet overlap of 88%

Abstract

The implementation and engineering of bright and coherent solid state quantum light sources is key for the realization of both on chip and remote quantum networks. Despite tremendous efforts for more than 15 years, the combination of these two key prerequisites in a single, potentially scalable device is a major challenge. Here, we report on the observation of bright and coherent single photon emission generated via pulsed, resonance fluorescence conditions from a single quantum dot (QD) deterministically centered in a micropillar cavity device via cryogenic optical lithography. The brightness of the QD fluorescence is greatly enhanced on resonance with the fundamental mode of the pillar, leading to an overall device efficiency of $\eta=(74\pm4)~\%$ for a single photon emission as pure as $g^{(2)}(0)=0.0092\pm0.0004$. The combination of large Purcell enhancement and resonant pumping conditions allows us to observe a two-photon wave packet overlap up to $\nu=(88\pm3)~\%$