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Nature 453, 45-46 (1 May 2008) | doi:10.1038/453045a; Published online 30 April 2008

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Quantum physics: The squeeze goes on

Eugene S. Polzik1

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After 20 years of hard labour, squeezed states — light and matter whose quantum fluctuations have been arduously suppressed below standard levels of quantum noise — are coming of age and are ripe for application.

Light is a quantum-mechanical object. One of the manifestations of that fact is that its amplitude (roughly, the number of photons present) and phase cannot be known simultaneously with arbitrary accuracy.

  1. Eugene S. Polzik is at QUANTOP — the Danish Quantum Optics Center, The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 København Ø, Denmark.
    Email: polzik@nbi.dk

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