First Resolution of Single Spin Flips with a Single Proton

In a just in Physical Review Letters published article we report on the first detection of single spin-flips of a single proton. We use Bayesian analysis methods and obtain spin state detection fidelities close to 100%. This is a major step towards the application of the so-called double Penning-trap method to measure magnetic moments of both the proton and the antiproton with ppb precision.

Direct measurement of the free cyclotron frequency of a single trapped proton

Penning traps are extremely powerful and versatile tools for high precision physics. This enormous impact is mainly based on the fact that in the magnetic field B of the trap the free cyclotron frequency of a trapped particle can be measured with high fractional precision. We invented a novel method to measure the free cyclotron frequency of a single trapped proton in one shot. The method is based on double-dressed states. By application of frequency modulated sideband drives the double dressing is produced, and energy is transferred between all eigenmodes of the trapped particle.

Observation of Spin Flips with a Single Trapped Proton

We have observed spin quantum-jumps with a single trapped proton for the first time. The result is a pioneering step forward in the endeavor to directly measure the magnetic properties of the proton and the antiproton with high precision, and was just published in Physical Review Letters. The measuring principle is based on the observation of a single proton stored in a Penning trap.

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