Surface acoustic wave regulated single photon emission from a coupled quantum dot-nanocavity system

TL;DR

This study demonstrates dynamic control of single photon emission from a quantum dot-nanocavity system using surface acoustic waves, enhancing light-matter interaction and enabling precise timing of photon emission.

Contribution

It introduces a method to tune a quantum dot-nanocavity system in and out of resonance with surface acoustic waves, achieving high-fidelity regulation of single photon emission.

Findings

Resonance tuning with surface acoustic waves enhances photon emission.

Strong Purcell effect observed during resonance.

High fidelity control of single photon stream achieved.

Abstract

A coupled quantum dot--nanocavity system in the weak coupling regime of cavity quantumelectrodynamics is dynamically tuned in and out of resonance by the coherent elastic field of a $f_{\rm SAW}\simeq800\,\mathrm{MHz}$ surface acoustic wave. When the system is brought to resonance by the sound wave, light-matter interaction is strongly increased by the Purcell effect. This leads to a precisely timed single photon emission as confirmed by the second order photon correlation function $g^{(2)}$. All relevant frequencies of our experiment are faithfully identified in the Fourier transform of $g^{(2)}$, demonstrating high fidelity regulation of the stream of single photons emitted by the system.