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      Indistinguishable photons from a single-photon device

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          A quantum dot single-photon turnstile device.

          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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            Electrically driven single-photon source.

            Electroluminescence from a single quantum dot within the intrinsic region of a p-i-n junction is shown to act as an electrically driven single-photon source. At low injection currents, the dot electroluminescence spectrum reveals a single sharp line due to exciton recombination, while another line due to the biexciton emerges at higher currents. The second-order correlation function of the diode displays anti-bunching under a continuous drive current. Single-photon emission is stimulated by subnanosecond voltage pulses. These results suggest that semiconductor technology can be used to mass-produce a single-photon source for applications in quantum information technology.
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              Ultralong Dephasing Time in InGaAs Quantum Dots

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                Author and article information

                Journal
                Nature
                Nature
                Springer Nature America, Inc
                0028-0836
                1476-4687
                October 2002
                October 10 2002
                October 2002
                : 419
                : 6907
                : 594-597
                Article
                10.1038/nature01086
                12374958
                bf547a02-078d-4f83-8a2f-e20fd94d36f6
                © 2002

                http://www.springer.com/tdm

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