Highly efficient semiconductor emitter of single photons in the red spectral range

The statistics of photon correlations in the emission of single InAs/AlGaAs quantum dots grown by molecular beam epitaxy and fitted with AlGaAs waveguide nanoantennas for efficient extraction of radiation is investigated. A single-photon source for the red spectral range with an average emission rate exceeding $5$ MHz and a zero-delay second-order correlation function of ${g}^{(2)}(0)=0.08$ is realized on the basis of these photonic nanostructures. The degree of indistinguishability of consecutively emitted photons measured in Hong–Ou–Mandel interferometry under above-barrier excitation is about $30\%$.