Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 18: Precision Measurements and Metrology V (joint session Q/A)
A 18.6: Vortrag
Mittwoch, 16. März 2022, 15:15–15:30, Q-H11
A dual-species multi-ion clock — •Hartmut Nimrod Hausser1, Tabea Nordmann1, Jan Kiethe1, Jonas Keller1, Nishant Bhatt1, Moritz von Boehn1, and Tanja E. Mehlstäubler1,2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Leibniz Universität Hannover, Hannover, Germany
The best optical ion clocks achieve systematic uncertainties around 1 × 10−18 enabling new applications such as relativistic geodesy with cm-level height resolution [1] and advancing the search for physics beyond the standard model. The major drawback of single-ion clocks is the low signal-to-noise ratio due to quantum projection noise which requires averaging times of several weeks to achieve a matching systematic uncertainty. Increasing the number of ions for example by a factor N ideally leads to N-times shorter averaging time for a given frequency resolution. Due to its intrinsically low sensitivities, 115In+ is an ideal candidate for a multi-ion clock with low systematic shifts [2]. We characterize clock operation with an 115In+ ion sympathetically cooled by an 172Yb+ ion in a segmented linear Paul trap and discuss its systematic uncertainty budget at the 10−17-level. We present our solution for scaling up the number of clock and cooling ions including the control of their order within the crystal and show multi-ion spectroscopy results that are optimized for contrast. The observed excitation agrees with our simple model, which accounts for the Debye-Waller effect due to the crystal dynamics after sympathetic cooling.
[1] T.E. Mehlstäubler et al., Rep. Prog. Phys. 81, 6 (2018)
[2] N. Herschbach et al., Appl. Phys. B 107, 891-906 (2012)