Fig. 2

Characterization of the broadband dielectric antenna and resonant excitation of XX state under 76 MHz pulsed excitation. a Single photon flux measured on APD, plotted as a function of laser excitation power (in saturation units), for a QD in dielectric antenna (red dot symbol) and in unprocessed bulk substrate (gray square symbol). At saturation, 3.3 million of single photons per second are detected. b Resonant excitation of the XX state using a two-photon pump scheme. The residual laser signal is strongly suppressed by the setup. c Intensity-correlation histogram from the X transition under two photon pumping excitation. Nearly ideal single-photon emissions is demonstrated by the vanishing multi-photon events at zero time delay \({\boldsymbol{g}}^2(0) \cong 0.002\) for both X and XX photons