Externally mode-matched cavity quantum electrodynamics with charge-tunable quantum dots

TL;DR

This paper demonstrates a charge-tunable quantum dot in a high-quality microcavity, achieving near-strong coupling for potential scalable quantum information processing involving single photons and electron spins.

Contribution

It introduces a charge-tunable quantum dot embedded in an externally mode-matched microcavity, advancing integrated systems for hybrid quantum information applications.

Findings

Achieved coherent reflection spectroscopy on a charge-tunable quantum dot

Formed a trion state interacting with the microcavity near strong coupling

Presents a step towards scalable quantum information schemes

Abstract

We present coherent reflection spectroscopy on a charge and DC Stark tunable quantum dot embedded in a high-quality and externally mode-matched microcavity. The addition of an exciton to a single-electron charged quantum dot forms a trion that interacts with the microcavity just below strong coupling regime of cavity quantum electrodynamics. Such an integrated, monolithic system is a crucial step towards the implementation of scalable hybrid quantum information schemes that are based on an efficient interaction between a single photon and a confined electron spin.