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This laser excitation of a quantum state of an atom of antimatter represents the most precise measurement performed on an anti-atom.

Electric fields from these potentials are negligible in the anti-atom trapping volume.

It marks a turning point from proof-of-principle experiments to serious metrology and precision CPT comparisons using the optical spectrum of an anti-atom.

The particles within the anti-atom are excited by the laser, causing them to absorb some light wavelengths and emit others. By comparing that spectrum to the one that comes from regular atoms, the scientists hope to figure out what makes antimatter so weird. The advance could open the door to testing some of the fundamental principles of physics.

Acting through the United Nations, these countries passed a quick succession of anti-atom resolutions.