Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Precision Measurements and Metrology II (joint session Q/A)
A 30.4: Poster
Donnerstag, 17. März 2022, 16:30–18:30, P
Towards testing Local Lorentz Invariance in a Coulomb crystal of 172Yb+ ions — •Kai C. Grensemann1, Chih-Han Yeh1, Laura S. Dreissen1, Henning A. Fürst1,2, and Tanja E. Mehlstäubler1,2 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover,Welfengarten 1, 30167 Hannover, Germany
We report on our recent progress towards testing Local Lorentz Invariance on a Coulomb crystal of 172Yb+ ions. The F-state of 172Yb+ is highly sensitive to low-energy Lorentz violation (LV) and the ion offers excellent experimental controllability [1]. While the Earth rotates, the quantization axis of our setup probes different directions in space. Thus, a potential LV would manifest itself in a modulation of the energy splitting between Zeeman sublevels throughout the sidereal day. However, the octupole transition to the F-state strongly suffers from a large AC-Stark shift of a few 100 Hz and a first order Zeeman sensitivity [2]. Therefore, to achieve efficient excitation of all ions, spatial homogeneity of the laser beam’s intensity and the magnetic field is needed. We address these challenges with simulations and experimentally, using ions as precise quantum sensors. In addition, we will discuss robust dynamical decoupling schemes [3] that make the measurement insensitive to slow magnetic field and intensity fluctuations.
[1] V.A. Dzuba et al., Nature Physics 12, 465-468 (2016). [2] H. A. Fürst et al., Phys. Rev. Lett. 125, 163001 (2020). [3] R. Shaniv et al., Phys. Rev. Lett. 120, 103202 (2018).