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A: Fachverband Atomphysik
A 11: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)
A 11.6: Vortrag
Dienstag, 12. März 2024, 12:15–12:30, HS 1098
Developments towards quantum logic spectroscopy for high-precision CPT symmetry tests in a cryogenic Penning trap — •Jan Schaper1, Julia Coenders1, Moritz von Boehn1, Nima Hashemi1, Juan Manuel Cornejo1, Stefan Ulmer3,4, and Christian Ospelkaus1,2 — 1Leibniz Universität Hannover, Germany — 2Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 3Ulmer Fundamental Symmetries Laboratory, Riken, Japan — 4Heinrich-Heine-Universität Düsseldorf, Germany
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 9Be+ both as cooling and logic ion [4].
This talk will present recent advances, including adiabatic transport in the ms-regime [5] and ground-state cooling of a single 9Be+ 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)
Keywords: Penning trap; Beryllium; CPT symmetry; high-precision spectroscopy; ground-state cooling