Quantum logic for antiproton g-factor measurements

by Juan M. Cornejo

Tuesday 20 Aug 2024, 14:00 → 15:00 Europe/Zurich

93/R-031 (CERN)

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 detection schemes that are highly sensitive on the particle's motional energy [1,2]. In this talk,an alternative experimental method which enables a speed up of the particles' preparation and a boost in readout fidelity in the respective experiments will be shown [3, 4]. 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 overwiew of our experimental apparatus based on a cryogenic multi-Penning-trap system as well as recent advances in the control and manipulation of a single 9Be+ ion will be presented.

[1] C. Smorra et al., Hyperfine Interact. 239, 47 (2018)
[2] G. Schneider et al., Science 358, 1081-1084 (2017)
[3] D. J. Wineland et al., J. Res. NIST 103, 259-328 (1998)
[4] J.M. Cornejo et al., New J. Phys. 23, 073045 (2021)