An excellent supply of single photons

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About ten years in the past, Richard Warburton, lead writer of the examine, and his workforce on the College of Basel, Switzerland, began out on the hunt for an SPS, which might, on the similar time, be environment friendly and ship pure and coherent single photons at a excessive repetition price. They settled for an method borrowed from the atom optics neighborhood; the researchers positioned the quantum dot in a miniaturized model of an open Fabry–Pérot cavity (Determine). The curved prime mirror has a radius of 10 μm and a depth of solely 500 nm. For years, the researchers grappled with quite a few experimental issues, corresponding to cost noise from the semiconductor surroundings, undesirable absorption inside the construction or from the floor, and the query of methods to optically excite the quantum dot. Warburton remembers: “We confronted many hurdles and questioned many occasions if we had been on an excellent observe. But, we pressed on.”

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