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Matter-antimatter symmetry requires the two magnetic moments to be equal and opposite.","posed_since":"","precise":"BASE compared proton and antiproton charge-to-mass ratios to 16 ppt (2022) and magnetic moments to about 1.5 ppb (2017). Determine whether $\\left|\\mu_{\\mathrm{pbar}}\\right|/\\mu_{\\mathrm{p}} - 1$ is nonzero at the $10^{-12}$ level, using sympathetic or quantum-logic cooling for faster single-spin-flip detection.","problem_ref":"e256dea0e0dbb033f8de50ce8ab972920cda3950ac0e844cb0d8a014c57f4cc8","references":"","settled_by":"Penning-trap measurements of the proton and antiproton g-factors each at sub-ppt uncertainty.","status_note":"","title":"Proton and antiproton magnetic moments compared at 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