A Quantum Dot Single-Photon Turnstile Device

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Science  22 Dec 2000:
Vol. 290, Issue 5500, pp. 2282-2285
DOI: 10.1126/science.290.5500.2282

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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.

  • * Present address: Institut für Festkörperphysik, Universität Bremen, Post Office Box 330440, D-28334 Bremen, Germany.

  • To whom correspondence should be addressed. E-mail: atac{at}

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