Speaker
Description
We present an experimental approach based on quantum logic inspired cooling and readout techniques to contribute to CPT tests in the baryonic sector. Within the BASE collaboration [1], these techniques would allow to cool single (anti-)protons to sub-Doppler temperatures by means of coupling to a laser-cooled beryllium ion [2, 3]. For this purpose, both ions will be co-trapped in an advanced cryogenic Penning trap system using an engineered double-well potential [4]. In addition, these techniques will lead to faster g-factor measurements of the (anti-)proton, resulting in better statistics and enabling proton-antiproton comparisons within daily sidereal timescales. In this contribution, we will show the current status of the project emphasizing the latest results on Doppler cooling of $^{9}$Be$^{+}$ ions as well as the latest modifications of the cryogenic Penning trap system.
[1] C. Smorra et al., Eur. Phys. J. Special Topics 224, 3055 (2015)
[2] D. J. Heinzen and D. J. Wineland, Phys. Rev. A 42, 2977 (1990)
[3] D. J. Wineland et al., J. Res. NIST 103, 259-328 (1998)
[4] M. Niemann et al., arXiv: 1906.09249 [physics.atom-ph] (2019)
