single-ion clock ; frequency metrology ; optical atomic clock ; high accuracy ; systematic frequency ; quantum-logic spectroscopy ; ac Zeeman shift ; micromotion ; 2nd-order Doppler shift ; collisional shift
Zusammenfassung
With the ongoing improvement in the accuracy of optical atomic clocks, new tools for timekeeping and for answering open questions of fundamental physicsbecome available. At this time, no other physical quantity can be measured more precisely than the frequency ratio between the best performing opticalclocks. Beating already now the accuracy of the SI definition of the second
by more than two orders of magnitude, they will be the foundation of its re-definition in the future (Riehle, 2015). The best clocks nowadays can resolve cm-scale height differences in the gravitational potential and thus are valuable tools in the field of geodesy and global navigation systems (Mehlstäubler et al., 2018). The ticking rates of optical clocks of dissimilar atomic species depend
differently on the value of fundamental physical constants. Hence, comparing their clock frequencies with high accuracy helps to unravel the inconsistencies in our understanding of the Universe and its evolution (Stadnik, 2017; Calmetand Keller, 2015). […]
The presented aluminum ion clock will be an important part of the timekeeping infrastructure at PTB and in the international network of optical clocks, because its characteristics with regard to the sensitivities to external perturbations and constancy of fundamental constants is complementary to other atomic species. Utilizing its high accuracy for frequency comparisons across PTB campus and by fiber links to other places in Europe (Predehl et al., 2012; Droste et al., 2013; Raupach, Koczwara, and Grosche, 2014), it will
contribute to the points stated in the beginning, and may help to resolve the deviations of frequency ratios between optical clocks of different species that were reported in Ref. (Beloy et al., 2021).
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Themenbereich der Metrologie
Zeit und Frequenz
Zitierung
Kramer, J. (2023). An aluminium optical clock setup and its evaluation using Ca⁺ [Dissertation, Universität Hannover, 2023]. Hannover: Gottfried Wilhelm Leibniz Universität. https://doi.org/10.15488/13300
