SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 59: Poster IV
Q 59.34: Poster
Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof
Scaling a robust Lorentz Symmetry test to multiple Yb+ ions — •Kai C. Grensemann1, Chih-Han Yeh1, Laura S. Dreissen1, 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 recently completed a test of local Lorentz invariance (LLI) in the electron-photon sector using a single trapped 172Yb+ ion [1]. With a novel approach based on composite pulse Ramsey spectroscopy [2] we fully exploited the ion’s high sensitivity to Lorentz violation (LV) [3] and reached second long coherence times. We extracted improved bounds on LV coefficients in the 10-21 region. Scaling the used method to a linear Coulomb crystal of N ions would further increase the sensitivity by √N. Here, we report on our ongoing efforts to test LLI on a 10 ion crystal. We show that the composite pulse sequence is highly robust against inhomogeneities of the magnetic and interaction fields, enabling easy upscaling to a 100 µm ion crystal. We also report on the progress of coherent multi-ion octupole excitation for efficient population of the F-state. The AC-Stark shift of several 100 Hz compared to a linewidth of 10 Hz [4] demands intensity deviations below ±4%, which we achieve by shaping the beam with a holographic phaseplate.
[1] L.S. Dreissen et al., Nat. Commun. 13, 7314 (2022). [2] R. Shaniv et al., Phys. Rev. Lett. 120, 103202 (2018). [3] V.A. Dzuba et al., Nature Physics 12, 465-468 (2016). [4] H. A. Fürst et al., Phys. Rev. Lett. 125, 163001 (2020).