Frequency Comparison of Two High-Accuracy Al+ Optical Clocks

Details Frequency Comparison of Two High-Accuracy Al+ Optical Clocks Frequency Comparison of Two High-Accuracy Al+ Optical Clocks

2009-11-24

arxiv.org/abs/0911.4527v2

Physics

Quantum Physics

4 pages, 2 tables, 3 figures

Scientific paper

We have constructed an optical clock with a fractional frequency inaccuracy of 8.6e-18, based on quantum logic spectroscopy of an Al+ ion. A simultaneously trapped Mg+ ion serves to sympathetically laser-cool the Al+ ion and detect its quantum state. The frequency of the 1S0->3P0 clock transition is compared to that of a previously constructed Al+ optical clock with a statistical measurement uncertainty of 7.0e-18. The two clocks exhibit a relative stability of 2.8e-15/ sqrt(tau), and a fractional frequency difference of -1.8e-17, consistent with the accuracy limit of the older clock.

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