Quantum logic inspired techniques for (anti-)proton g-factor measurements with Penning traps
Dr. Juan Manuel Cornejo-Garcia (Institut für Quantenoptik, Universität Hannover)

Cosmological observations point to an apparent imbalance of matter and antimatter in our universe, which contrasts with the nearly perfect symmetry arising on the level of single particles. Tests for hypothetical limits to this symmetry rest on high precision comparisons of the fundamental properties of particles and antiparticles - for example, with measurements of the proton and antiproton g-factors in Penning traps. However, these measurements rely on cooling and detections schemes that are highly sensitive on the particle's motional energy [1,2].
In this talk, it will be shown an alternative experimental method which enables a speed up of the particles' preparation and a boost in readout fidelity in the respective experiments [3]. Our method allows for sympathetic cooling of a proton or antiproton to its quantum mechanical ground state and provides readout of their spin state, by means of coupling to a laser cooled 9Be+ ion co-trapped in a double well potential. In addition, an overview of the current experimental setup featuring a cryogenic Penning trap stack for first demonstrations of motional coupling between two 9Be+ ions will be presented.

[1] C. Smorra et al., Nature 550, 371-374 (2017) [2] G. Schneider et al., Science 358, 1081-1084 (2017) [3] D. J. Wineland et al., J. Res. NIST 103, 259-328 (1998)