Quantum-optical spectroscopy of a two-level system using an electrically driven micropillar laser as resonant excitation source

TL;DR

This study demonstrates quantum-optical spectroscopy of a semiconductor quantum dot using a compact electrically driven micropillar laser as a resonant excitation source, enabling efficient and coherent control of quantum emitters.

Contribution

It introduces a novel setup employing a high-$eta$ microlaser for resonant excitation of quantum dots, replacing bulky lasers and advancing integrated quantum photonics.

Findings

Achieved strong multi-photon suppression with $g^{(2)}(0)=0.02$

Demonstrated high photon indistinguishability of 57%

Successfully dressed the excitonic state under continuous wave excitation

Abstract

Two-level emitters constitute main building blocks of photonic quantum systems and are model systems for the exploration of quantum optics in the solid state. Most interesting is the strict-resonant excitation of such emitters to generate close to ideal quantum light and to control their occupation coherently. Up till now related experiments have been performed exclusively using bulky lasers which hinders the application of resonantly driven two-level emitters in photonic quantum systems. Here we perform quantum-optical spectroscopy of a two-level system using a compact high-$\beta$ microlaser as excitation source. The two-level system is based on a semiconductor quantum dot (QD), which is excited resonantly by a fiber-coupled electrically driven micropillar laser. In this way we dress the excitonic state of the QD under continuous wave excitation and trigger the emission of single-photons with strong multi-photon suppression ($g^{(2)}(0)=0.02$) and high photon indistinguishably ($V=57\pm9\%$) via pulsed resonant excitation at 156 MHz.