Physicists succeeded in creating a single-positron quantum cyclotron, where the positron functions as a quantum cyclotron for the first time. Researchers were able to trap the positron in a Penning trap and study its lowest cyclotron and spin levels.
To conduct the experiment, the antiparticle was directed through a tungsten monocrystal into a special field that had a quadratic dependence on the coordinate. As a result of the observation, an energy transition by one and two quanta was recorded, and a spin flip occurred under conditions of strong excitation.
The created experimental setup will subsequently allow for the determination of the positron's magnetic moment with high precision—up to $10^{-13}$. This precision will be comparable to the results obtained from similar measurements for the electron. Achieving this result marks a new stage in testing CPT invariance for leptons.
Details of the work conducted were published in the scientific journal Physical Review Letters.