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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%.
Nadia O. Antoniadis,Natasha Tomm,Alisa Javadi,Rüdiger Schott,Sascha R. Valentin,Andreas D. Wieck,Arne Ludwig, andRichard J. Warburton
"Measurement of the efficiency of a bright quantum-dot-based single-photon source", Proc. SPIE 12446, Quantum Computing, Communication, and Simulation III, 124460S (8 March 2023); https://doi.org/10.1117/12.2657247
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Nadia O. Antoniadis, Natasha Tomm, Alisa Javadi, Rüdiger Schott, Sascha R. Valentin, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton, "Measurement of the efficiency of a bright quantum-dot-based single-photon source," Proc. SPIE 12446, Quantum Computing, Communication, and Simulation III, 124460S (8 March 2023); https://doi.org/10.1117/12.2657247