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|Author(s):||Chin-Wen 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|
|Keywords:||atomic clock,optical clock,high accuracy,aluminum ion,quantum logic|
|Research Areas:||Physics, Quantum Information|
|PDF version:||Click here to retrieve PDF version of paper (200KB)|