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Frequency Comparison of Two High-Accuracy Al+ Optical Clocks

Published

Author(s)

Chin-Wen Chou, David Hume, J.C. Koelemeij, David J. Wineland, Till P. Rosenband

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

Keywords

atomic clock, optical clock, high accuracy, aluminum ion, quantum logic

Citation

Chou, C. , Hume, D. , Koelemeij, J. , Wineland, D. and Rosenband, T. (2010), Frequency Comparison of Two High-Accuracy Al+ Optical Clocks, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904590 (Accessed December 7, 2021)
Created February 17, 2010, Updated February 19, 2017