RESUMO
For the first time a single trapped antiproton (p) is used to measure the p magnetic moment µ(p). The moment µ(p)=µ(p)S/(â/2) is given in terms of its spin S and the nuclear magneton (µ(N)) by µ(p)/µ(N)=-2.792 845±0.000 012. The 4.4 parts per million (ppm) uncertainty is 680 times smaller than previously realized. Comparing to the proton moment measured using the same method and trap electrodes gives µ(p)/µ(p)=-1.000 000±0.000 005 to 5 ppm, for a proton moment µ(p)=µ(p)S/(â/2), consistent with the prediction of the CPT theorem.
RESUMO
Previous measurements with a single trapped proton (p) or antiproton (p) detected spin resonance from the increased scatter of frequency measurements caused by many spin flips. Here a measured correlation confirms that individual spin transitions and states are rapidly detected instead. The 96% fidelity and an efficiency expected to approach unity suggests that it may be possible to use quantum jump spectroscopy to measure the p and p magnetic moments much more precisely.
