A quantum scattering interferometer

Russell A. Hart, Xinye Xu, Ronald Legere and Kurt Gibble ()
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Russell A. Hart: The Pennsylvania State University, University Park, Pennsylvania 16802, USA
Xinye Xu: The Pennsylvania State University, University Park, Pennsylvania 16802, USA
Ronald Legere: The Pennsylvania State University, University Park, Pennsylvania 16802, USA
Kurt Gibble: The Pennsylvania State University, University Park, Pennsylvania 16802, USA

Nature, 2007, vol. 446, issue 7138, 892-895

Abstract: Constant vigilance Low temperature atom-atom scattering is central to the dynamics of Bose-Einstein condensates and degenerate Fermi gases, and limits the accuracy of the world's best atomic clocks. Precise low temperature measurements of scattering phase shifts have not been possible because of a dependence on atomic density, which cannot be precisely measured. Now Hart et al. have developed a fundamentally new type of scattering measurement that juggles clouds of atoms to directly observe the low-temperature scattering in a density-independent manner. The new device, called a quantum scattering interferometer, probes the scattering of each atom with atomic-clock precision, and it may be able to answer the question of whether the fundamental constants of physics actually change with time.

Date: 2007
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DOI: 10.1038/nature05680

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