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Ultracold strontium clock: Applications to the measurement of fundamental constant variations

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Abstract

We describe the application of high accuracy Srspectroscopy to the measurement of the variation of thefundamental constants of nature. We first describe recent progressof the JILA Sr optical frequency standard, with a systematicuncertainty evaluation at the 10-16 fractional frequencylevel. Using recent internationally based measurements of the Srclock frequency, we show improved constraints of gravitational andtemporal changes in the fine structure constant and theelectron-proton mass ratio. Finally, we describe how ultracoldatomic strontium, confined in an optical lattice, can beassociated into molecular dimers and be used for amodel-independent measurement of the variation of theelectron-proton mass ratio.

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Authors and Affiliations

  1. JILA, National Institute of Standards and Technology and University of Colorado 440 UCB, Boulder, CO, 80309-0440, USA

    A. D. Ludlow, S. Blatt, T. Zelevinsky, G. K. Campbell, M. J. Martin, J. W. Thomsen, M. M. Boyd & J. Ye

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  1. A. D. Ludlow
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  2. S. Blatt
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  3. T. Zelevinsky
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  4. G. K. Campbell
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  5. M. J. Martin
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  6. J. W. Thomsen
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  7. M. M. Boyd
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  8. J. Ye
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Correspondence to A. D. Ludlow.

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Ludlow, A., Blatt, S., Zelevinsky, T. et al. Ultracold strontium clock: Applications to the measurement of fundamental constant variations. Eur. Phys. J. Spec. Top. 163, 9–18 (2008). https://doi.org/10.1140/epjst/e2008-00806-8

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