Speaker
Description
High-precision matter-antimatter comparisons allow to test CPT symmetry and to search for new physics beyond the standard model. The BASE collaboration contributes to these tests by measuring the charge-to-mass ratio and $g$-factor of protons and antiprotons in cryogenic Penning traps [1-3]. The BASE experiment at the Leibniz University Hannover is developing measurement schemes based on sympathetic cooling and quantum logic spectroscopy to further increase sampling rates, using $^9$Be$^+$ both as cooling and logic ion [4].
This contribution will present recent advances, including adiabatic transport in the ms-regime [5] and ground-state cooling of a single $^9$Be$^+$ ion [6]. Furthermore, upcoming changes to the experimental apparatus, including a redesigned Penning trap stack, will be shown.
[1] G. Schneider et al., Science 358, 1081 (2017)
[2] C. Smorra et al., Nature 550, 371 (2017)
[3] M.J. Borchert et al., Nature 601, 53 (2022)
[4] Juan M Cornejo et al 2021 New J. Phys. 23 073045
[5] Meiners et al., arXiv:2309.06776 (2023)
[6] Cornejo et at., arXiv:2310.18262 (2023)
