A single-photon source has been developed using a single quantum dot to mimic a two-level atom. Low noise is achieved by operation at low temperature, the use of very high quality material, and by embedding the quantum dots in a diode structure. A single quantum dot is tuned into resonance with an open microcavity, a highly miniaturised Fabry-Perot cavity. The Purcell factor is approximately ten resulting in a radiative lifetime of just 50 ps. An end-to-end efficiency of above 50% is achieved and the photons exhibit two-photon interference with a visibility of 98%.
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