Single-atom optical clock with high accuracy.

@article{Oskay2006SingleatomOC,
  title={Single-atom optical clock with high accuracy.},
  author={W. H. Oskay and Scott A. Diddams and E. A. Donley and T. M. Fortier and T. P. Heavner and Leo Hollberg and Wayne M. Itano and S. R. Jefferts and microXANES. J. S. Delaney and K Kim and Francesca Levi and Thomas E. Parker and James C. Bergquist},
  journal={Physical review letters},
  year={2006},
  volume={97 2},
  pages={020801}
}
For the past 50 years, atomic standards based on the frequency of the cesium ground-state hyperfine transition have been the most accurate time pieces in the world. We now report a comparison between the cesium fountain standard NIST-F1, which has been evaluated with an inaccuracy of about 4 x 10(-16), and an optical frequency standard based on an ultraviolet transition in a single, laser-cooled mercury ion for which the fractional systematic frequency uncertainty was below 7.2 x 10(-17). The… CONTINUE READING
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