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Science. 2000 Dec 22;290(5500):2282-5.

A quantum dot single-photon turnstile device.

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  • 1Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA.


Quantum communication relies on the availability of light pulses with strong quantum correlations among photons. An example of such an optical source is a single-photon pulse with a vanishing probability for detecting two or more photons. Using pulsed laser excitation of a single quantum dot, a single-photon turnstile device that generates a train of single-photon pulses was demonstrated. For a spectrally isolated quantum dot, nearly 100% of the excitation pulses lead to emission of a single photon, yielding an ideal single-photon source.

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