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

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 $f_{\mathrm{S}\mathrm{A}\mathrm{W}}\simeq 800\mathrm{M}\mathrm{H}\mathrm{z}$ 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.