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Doubling Measurements with Light

May 15 2007

Research from the University of Bristol has demonstrated a way to almost double measurement precision by using photons of light with which to gauge distances. Their findings were reported in the international journal Science.

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Dr Jeremy O’Brien, the only British member of an otherwise all-Japanese team, said: “The precision of such a measurement depends on the wavelength of the light used. By using a group of four-photons, the set behaves as if it had a shorter wavelength than a single photon. This is rather like using a ruler with spacing four times as fine.”

Further details of this ground-breaking research can be read at Science News.

The paper: Beating the standard quantum limit with four-entangled photons Tomohisa Nagata, Ryo Okamoto, Jeremy L. O'Brien, Keiji Sasaki, and Shigeki Takeuch Science 4 May 2007: Vol. 316. no. 5825, pp. 726 - 729 DOI: 10.1126/science.1138007.

http://www.bris.ac.uk

Posetd 15th May 2007

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