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Science 1 August 2003:
Vol. 301. no. 5633, pp. 604 - 605
DOI: 10.1126/science.1087850
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Perspectives

PHYSICS:
Getting Entangled in Free Space

J. G. Rarity

Entanglement is a counterintuitive property of quantum mechanics that allows particles such as photons to be much more strongly correlated than is possible in a classical world. In his Perspective, Rarity explains how this property may be exploited in long-distance communication. He highlights the report by Aspelmeyer et al., who demonstrate that photons can remain entangled over distances of 600 m in free space. The results indicate that satellites in low-Earth orbit may be used for quantum communication based on entanglement.

The author is in the Department of Electrical Engineering, Bristol University, Bristol BS8 1UB, UK. E-mail: john.rarity{at}bristol.ac.uk

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