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Publication Citation: Frequency Comparison of Two High-Accuracy Al+ Optical Clocks

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Author(s): Chin W. Chou; David Hume; J.C. Koelemeij; David J. Wineland; Till P. Rosenband;
Title: Frequency Comparison of Two High-Accuracy Al+ Optical Clocks
Published: February 17, 2010
Abstract: 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.
Citation: Physical Review Letters
Volume: 104
Pages: 4 pp.
Keywords: atomic clock;optical clock;high accuracy;aluminum ion;quantum logic
Research Areas: Physics, Quantum Information
PDF version: PDF Document Click here to retrieve PDF version of paper (200KB)