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Science 30 November 2007:
Vol. 318. no. 5855, pp. 1393 - 1394
DOI: 10.1126/science.1152581
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Perspectives

PHYSICS:
Precision Without Entanglement

Jeremy L. O'Brien

A recent experiment shows that exotic quantum processes are not necessary to reach the ultimate limits of measurement.

The author is at the Centre for Quantum Photonics, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol, BS8 1UB, UK. E-mail: Jeremy.OBrien{at}bristol.ac.uk

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