For the first time, spin flips of a single trapped proton in free space have been observed. This is a major step towards a million-fold improved test of matter–antimatter symmetry using a nuclear magnetic moment.
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Blatt, R. Spin flips with a single proton. Nature 475, 298–299 (2011). https://doi.org/10.1038/475298a
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DOI: https://doi.org/10.1038/475298a
