Frequency Ratio of Al+ and Hg+ Single-Ion Optical Clocks; Metrology at the 17th Decimal Place

  title={Frequency Ratio of Al+ and Hg+ Single-Ion Optical Clocks; Metrology at the 17th Decimal Place},
  author={Till Rosenband and David B. Hume and Piet O Schmidt and Chin-wen Chou and Anders Brusch and Luca Lorini and Windell H. Oskay and R. E. Drullinger and Tara M. Fortier and Jason E. Stalnaker and Scott A. Diddams and William C. Swann and Nathan R. Newbury and Wayne M. Itano and David J. Wineland and James C. Bergquist},
  pages={1808 - 1812}
Time has always had a special status in physics because of its fundamental role in specifying the regularities of nature and because of the extraordinary precision with which it can be measured. This precision enables tests of fundamental physics and cosmology, as well as practical applications such as satellite navigation. Recently, a regime of operation for atomic clocks based on optical transitions has become possible, promising even higher performance. We report the frequency ratio of two… Expand
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