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Science 27 June 2008:
Vol. 320. no. 5884, pp. 1734 - 1738
DOI: 10.1126/science.1148259
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Review

Quantum State Engineering and Precision Metrology Using State-Insensitive Light Traps

Jun Ye,1* H. J. Kimble,2 Hidetoshi Katori3

Precision metrology and quantum measurement often demand that matter be prepared in well-defined quantum states for both internal and external degrees of freedom. Laser-cooled neutral atoms localized in a deeply confining optical potential satisfy this requirement. With an appropriate choice of wavelength and polarization for the optical trap, two electronic states of an atom can experience the same trapping potential, permitting coherent control of electronic transitions independent of the atomic center-of-mass motion. Here, we review a number of recent experiments that use this approach to investigate precision quantum metrology for optical atomic clocks and coherent control of optical interactions of single atoms and photons within the context of cavity quantum electrodynamics. We also provide a brief survey of promising prospects for future work.

1 JILA, National Institute of Standards and Technology (NIST) and University of Colorado, Boulder, CO 80309–0440, USA.
2 Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, CA 91125, USA.
3 Department of Applied Physics, School of Engineering, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.

* To whom correspondence should be addressed. E-mail: ye{at}jila.colorado.edu

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