Room-temperature solid-state single-photon source with high purity and controllable waveforms

Single photon emitters are indispensable to photonic quantum technologies. Here we demonstrate a room-temperature quantum-dot-based source of single photons with a purity of 99{\%} and control- lable waveforms. We show that the high purify of the single photons does not vary with excitation power or between different samples. The waveform-controlled single photons also have potential applications of optimum quantum state transfer in quantum networks, high-efficiency quantum storage and retrieval of single photons, or quantum key distribution with high key creation efficiency.