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

M. Weiß, S. Kapfinger, T. Reichert, J. J. Finley, A. Wixforth, M. Kaniber, H. J. Krenner

Applied Physics Letters 109, 033105 (2016) DOI: Applied Physics Letters

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  ≃ 800 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, (2). All relevant frequencies of our experiment are faithfully identified in the Fourier transform of (2), demonstrating high fidelity regulation of the stream of single photons emitted by the system.