paper

Observation of individual spin quantum transitions of a single antiproton

arXiv:1703.07096 · doi:10.1016/j.physletb.2017.03.024

Abstract

We report on the detection of individual spin quantum transitions of a single trapped antiproton in a Penning trap. The spin-state determination, which is based on the unambiguous detection of axial frequency shifts in presence of a strong magnetic bottle, reaches a fidelity of 92.1 $%$ . Spin-state initialization with $> 99.9%$ fidelity and an average initialization time of 24 min are demonstrated. This is a major step towards an antiproton magnetic moment measurement with a relative uncertainty on the part-per-billion level.