A single-photon emitter coupled to a phononic-crystal resonator in the resolved-sideband regime

Abstract

A promising route towards the heralded creation and annihilation of single-phonons is to couple a single-photon emitter to a mechanical resonator. The challenge lies in reaching the resolved-sideband regime with a large coupling rate and a high mechanical quality factor. We achieve all of this by coupling self-assembled InAs quantum dots to a small-mode-volume phononic-crystal resonator with mechanical frequency ${\Omega }_{\mathrm{m}}/2\pi =1.466\mathrm{GHz}$ and quality factor $Q_{\mathrm{m}}=2.1\times 10^3$. Thanks to the high coupling rate of $g_{\mathrm{ep}}/2\pi =2.9\mathrm{MHz}$, and by exploiting a matching condition between the effective Rabi and mechanical frequencies, we are able to observe the interaction between the two systems. Our results represent a major step towards quantum control of the mechanical resonator via a single-photon emitter.