SAMOP 2023 – scientific programme
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QI: Fachverband Quanteninformation
QI 27: Precision Measurements with Optical Clocks (joint session Q/QI)
QI 27.7: Talk
Thursday, March 9, 2023, 12:45–13:00, E001
An indium ion clock with a systematic uncertainty on the 10−18-level — •Hartmut Nimrod Hausser1, Tabea Nordmann1, Jan Kiethe1, Nishant Bhatt1, Moritz von Boehn1, Ingrid Maria Dippel1, Jonas Keller1, and Tanja E. Mehlstäubler1,2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Leibniz Universität Hannover, Hannover, Germany
Frequency is the most accurate physical property that can be measured by man-made machines. Nowadays, the best atomic clocks are based on optical transitions and reach systematic uncertainties around 1×10−18 surpassing the clocks that currently define the SI unit of time by a factor of 100 and more. Because of its intrinsically low sensitivities, 115In+ is a candidate for a clock with a systematic uncertainty on the 10−19-level, not only for a single but also multiple indium ions. This so-called "multi-ion clock" allows for shorter averaging times to reach a given statistical uncertainty level [1,2].
In this talk, we will demonstrate clock operation with an 115In+ ion sympathetically cooled by three 172Yb+ ions in a segmented linear Paul trap. The systematic uncertainty is evaluated on the 10−18-level. The setup is optimized for clock operation with multiple 115In+ ions allowing for a similar systematic uncertainty as a single-ion clock [1]. First clock operation with multiple indium ions featuring individual state readout on an EMCCD camera is shown and discussed.
[1] N. Herschbach et al., Appl. Phys. B 107, 891-906 (2012)
[2] J. Keller et al., Phys. Rev. A 99, 013405 (2019)