We report on the first detailed study of motional heating in a cryogenic Penning trap using a single antiproton. Employing the continuous Stern-Gerlach effect we observe cyclotron quantum transition rates of 6(1) quanta/h and an electric field noise spectral density below $7.5(3.4)\times 10^{ -20}\,\text{ V}^{ 2}\text{ m}^{ -2} \text{ Hz}^{ -1}$, which corresponds to a scaled noise spectral density below $8.8(4.0)\times 10^{ -12}\,\text{ V}^{ 2}\text{ m}^{ -2}$, results which are more than two orders of magnitude smaller than those reported by other ion trap experiments.
Categories: physics.atom-ph