Nature research paper: An optical atomic clock based on a highly charged ion
We thank L. Schmöger, M. Schwarz and J. Stark for early contributions to the experimental apparatus, T. Legero for his contributions to the frequency stabilization of the HCI spectroscopy laser, H. Margolis for discussions about the analysis of the frequency data and F. Wolf for comments on the manuscript. A.S. and V.A.Y. thank I. I. Tupitsyn for discussions.
The project was supported by the Physikalisch-Technische Bundesanstalt, the Max Planck Society, the Max Planck-Riken-PTB Center for Time, Constants and Fundamental Symmetries, and the Deutsche Forschungsgemeinschaft through SCHM2678/5-1, SU 658/4-2, the collaborative research centres SFB 1225 ISOQUANT and SFB 1227 DQ-mat, and under Germany’s Excellence Strategy – EXC-2123 QuantumFrontiers – 390837967.
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