European Conference on Trapped Ions (ECTI)

Comparisons of fundamental properties of matter and antimatter provide stringent tests of CPT symmetry [1]. Throughout the past years, measurements of proton and antiproton g-factors in Penning traps have been carried out with outstanding precision, setting new constraints on CPT violating effects of the SME [2,3]. However, these experiments rely on time consuming particle cooling and state detection schemes based on image current detection (see e.g. [3]),
currently limiting measurement sampling rate and accuracy.
To overcome these limitations, we develop new cooling and state readout techniques following a proposal by Heinzen and Wineland [4,5]. In our approach, we want to couple an (anti-)proton to a laser (ground-state) cooled ${}^9{\mathrm{Be}}^{+}$ using free-space Coulomb-coupling in a double-well potential. This should allow to ground-state cool the (anti-)proton and detect its spin state by means of a quantum-logic inspired readout protocol [6].
In this contribution, we present the basic concept of our approach as well as latest advances of our experiment on resolved axial sideband cooling and fast adiabatic transport of a single ${}^9{\mathrm{Be}}^{+}$, which are mandatory steps towards implementing quantum-logic spectroscopy.

[1] V. A. Kostelecký et al., Rev. Mod. Phys. 83, 11 (2011)
[2] C. Smorra et al., Nature 550, 371–374 (2017)
[3] G. Schneider et al., Science 358, 1081 (2017)
[4] D. J. Heinzen and D. J. Wineland, Phys. Rev. A 42, 2977 (1990)
[5] D. J. Wineland et al., J. Res. NIST 103, 259 (1998)
[6] J. M. Cornejo et al., New J. Phys. 23 (2021) 073045