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Science 29 July 2005:
Vol. 309. no. 5735, pp. 749 - 752
DOI: 10.1126/science.1114375
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Reports

Spectroscopy Using Quantum Logic

P. O. Schmidt,*{dagger} T. Rosenband, C. Langer, W. M. Itano, J. C. Bergquist, D. J. Wineland

We present a general technique for precision spectroscopy of atoms that lack suitable transitions for efficient laser cooling, internal state preparation, and detection. In our implementation with trapped atomic ions, an auxiliary "logic" ion provides sympathetic laser cooling, state initialization, and detection for a simultaneously trapped "spectroscopy" ion. Detection is achieved by applying a mapping operation to each ion, which results in a coherent transfer of the spectroscopy ion's internal state onto the logic ion, where it is then measured with high efficiency. Experimental realization, by using 9Be+ as the logic ion and 27Al+ as the spectroscopy ion, indicates the feasibility of applying this technique to make accurate optical clocks based on single ions.

Time and Frequency Division, National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA.

* Present address: Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.

{dagger} To whom correspondence should be addressed. E-mail: piet.schmidt{at}uibk.ac.at

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Frequency Ratio of Al+ and Hg+ Single-Ion Optical Clocks; Metrology at the 17th Decimal Place.
T. Rosenband, D. B. Hume, P. O. Schmidt, C. W. Chou, A. Brusch, L. Lorini, W. H. Oskay, R. E. Drullinger, T. M. Fortier, J. E. Stalnaker, et al. (2008)
Science 319, 1808-1812
   Abstract »    Full Text »    PDF »
Optical Atomic Coherence at the 1-Second Time Scale.
M. M. Boyd, T. Zelevinsky, A. D. Ludlow, S. M. Foreman, S. Blatt, T. Ido, and J. Ye (2006)
Science 314, 1430-1433
   Abstract »    Full Text »    PDF »


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