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A: Fachverband Atomphysik
A 19: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)
A 19.7: Vortrag
Mittwoch, 4. März 2026, 16:15–16:30, N 3
A robust technique for ground-state cooling of antimatter in cryogenic multi-Penning traps — •Nikita Poljakov1, Philipp Hoffmann1, Marek Prasse1, Jan Schaper1, Julia Coenders1, Juan Manuel Cornejo2, Klemens Hammerer3, Stefan Ulmer4,5, and Christian Ospelkaus1,6 — 1Leibniz Universität Hannover, Germany — 2Universidad de Cádiz, Spain — 3Universität Innsbruck, Austria — 4Ulmer Fundamental Symmetries Laboratory, RIKEN, Japan — 5Heinrich-Heine-Universität Düsseldorf, Germany — 6Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
Within the BASE collaboration, we deployed a cryogenic multi-Penning trap to contribute to high-precision (anti-)proton g-factor measurements[1,2] to test CPT symmetry via quantum logic spectroscopy (QLS)[3] with a 9Be+ cooling and logic ion. After demonstrating key steps - optical sideband spectroscopy[4], ground-state cooling[5] of a 9Be+ ion, and fast adiabatic transport[6] - we turn to ground-state cooling of the (anti-)proton. We simulate its Coulomb coupling to a 9Be+ ion in a double-well potential in a microfabricated Penning trap. The 9:1 mass ratio causes anharmonicities that hinder cooling of 4 K (anti-)protons under static potentials. A frequency sweep of the 9Be+ well maintains resonance and enables ground-state cooling. This technique is also applicable to other laser-inaccessible (anti-)particles. [1]G. Schneider et al., Science 358 (2017) [2]C. Smorra et al., Nature 550 (2017) [3]P. Schmidt et al., Science 309 (2005) [4]J. Cornejo et al., Phys. Rev. Res. 6 (2023) [5]J. Cornejo et al., Phys. Rev. Res. 6 (2024) [6]M. Boehn et al., Comms. Phys. 8 (2025).
Keywords: Penning trap; proton; antiproton; CPT; g-factor