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Science 19 November 2004:
Vol. 306. no. 5700, pp. 1355 - 1358
DOI: 10.1126/science.1105497
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Reports

Hertz-Level Measurement of the Optical Clock Frequency in a Single 88Sr+ Ion

H. S. Margolis,* G. P. Barwood, G. Huang, H. A. Klein, S. N. Lea, K. Szymaniec, P. Gill

The frequency of the 5s 2S1/2–4d 2D5/2 electric quadrupole clock transition in a single, trapped, laser-cooled 88Sr+ ion has been measured by using an optical frequency comb referenced to a cesium fountain primary frequency standard. The frequency of the transition is measured as 444,779,044,095,484.6 (1.5) hertz, with a fractional uncertainty within a factor of 3 of that of the cesium standard. Improvements required to obtain a cesium-limited frequency measurement are described and are expected to lead to a 88Sr+ optical clock with stability and reproducibility exceeding that of the primary cesium standard.

National Physical Laboratory (NPL), Teddington, Middlesex TW11 0LW, UK.

* To whom correspondence should be addressed. E-mail: helen.margolis{at}npl.co.uk

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Sr Lattice Clock at 1 x 10-16 Fractional Uncertainty by Remote Optical Evaluation with a Ca Clock.
A. D. Ludlow, T. Zelevinsky, G. K. Campbell, S. Blatt, M. M. Boyd, M. H. G. de Miranda, M. J. Martin, J. W. Thomsen, S. M. Foreman, J. Ye, et al. (2008)
Science 319, 1805-1808
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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
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Precision spectroscopy of hydrogen and femtosecond laser frequency combs.
T.W Hansch, J Alnis, P Fendel, M Fischer, C Gohle, M Herrmann, R Holzwarth, N Kolachevsky, T. Udem, and M Zimmermann (2005)
Phil Trans R Soc A 363, 2155-2163
   Abstract »    Full Text »    PDF »


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