Single Photons "on Demand"

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Science  22 Dec 2000:
Vol. 290, Issue 5500, pp. 2273-2274
DOI: 10.1126/science.290.5500.2273

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Quantum cryptography offers the potential of totally secure transfer of information, but as Benjamin discusses in this Perspective, its practical implementation hinges on being able to generate single photons (rather than two or more) at a time. Michler et al. show how this condition can be met in a quantum dot microdisk structure. Single molecules were also recently shown to allow controlled single-photon emission.