Atom-chip-based generation of entanglement for quantum metrology

Max F. Riedel, Pascal Böhi, Yun Li, Theodor W. Hänsch, Alice Sinatra () and Philipp Treutlein ()
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Max F. Riedel: Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstraße 4, 80799 München, Germany
Pascal Böhi: Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstraße 4, 80799 München, Germany
Yun Li: Laboratoire Kastler Brossel, ENS, 24 rue Lhomond, F-75005 Paris, France
Theodor W. Hänsch: Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstraße 4, 80799 München, Germany
Alice Sinatra: Laboratoire Kastler Brossel, ENS, 24 rue Lhomond, F-75005 Paris, France
Philipp Treutlein: Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstraße 4, 80799 München, Germany

Nature, 2010, vol. 464, issue 7292, 1170-1173

Abstract: Quantum measurement in a tangle Atom interferometers, which rely on the wave properties of particles, are used in a variety of ultra-high-precision measurements, from determining the gravitational constant to defining the time standard. The precision of interferometers is generally limited by classical statistics, arising from the finite number of atoms used in the experiment. Two papers in this issue demonstrate the potential of 'spin-squeezing' in Bose–Einstein condensates (BECs) to facilitate measurements that are more precise than classical statistics allow. Using a specially prepared BEC as the input to an interferometer, Gross et al. beat the classical precision limit. In the second study, Riedel et al. create similar 'spin-squeezed' states in a BEC confined to an 'atom chip' by controlling elastic collisional interactions with a state-dependent potential. This demonstration of multi-particle entanglement on a chip raises the prospect of chip-based portable atomic clocks that also beat the classical precision limits.

Date: 2010
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DOI: 10.1038/nature08988

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