title: Self-excitation and feedback cooling of an isolated proton.
abstract: The first one-proton self-excited oscillator (SEO) and one-proton feedback cooling are demonstrated. In a Penning trap with a large magnetic gradient, the SEO frequency is resolved to the high precision needed to detect a one-proton spin flip. This is after undamped magnetron motion is sideband cooled to a 14 mK theoretical limit, and despite random frequency shifts (typically larger than those from a spin flip) that take place every time sideband cooling is applied. The observations open a possible path towards a million-fold improved comparison of the p and p magnetic moments.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: N
authors.initials: N
authors.lastname: Guise
authors.forename: J
authors.initials: J
authors.lastname: DiSciacca
authors.forename: G
authors.initials: G
authors.lastname: Gabrielse