# Measurement of ultra-low heating rates of a single antiproton in a cryogenic Penning trap

## TL;DR

This study measures extremely low motional heating rates of a single antiproton in a cryogenic Penning trap, demonstrating noise levels significantly lower than previous ion trap experiments, advancing precision in antimatter research.

## Contribution

First detailed measurement of motional heating of a single antiproton in a cryogenic Penning trap with ultra-low noise levels, surpassing prior ion trap results.

## Key findings

- Cyclotron quantum transition rate of 6(1) quanta/h
- Electric field noise spectral density below 7.5(3.4)×10^{-20} V^2/m^2/Hz
- Noise levels over two orders of magnitude lower than previous experiments

## Abstract

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.