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Science 22 December 2000:
Vol. 290. no. 5500, pp. 2273 - 2274
DOI: 10.1126/science.290.5500.2273
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Perspectives

QUANTUM CRYPTOGRAPHY:
Single Photons "on Demand"

Simon Benjamin

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.

The author is at the Centre for Quantum Computation, www.qubit.org, University of Oxford, Oxford, OX1 3PU UK. E-mail: s.benjamin{at}qubit.org.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)