Magic Is in the Eye of the Measure

arXiv:2611.08586v1 Announce Type: new Abstract: Magic, or nonstabilizerness, is the quantum resource behind universal quantum computation. Its applications in high-energy and nuclear physics rely almost exclusively on the stabilizer R\'enyi entropy (SRE), although magic has no unique measure. For two qubits, we compare the SRE with three measures defined through optimizations over stabilizer states: the min- and max-relative entropies of magic and the logarithmic free robustness. We determine the maximal-magic states of all four measures, with exact proofs, and find that they depend on the measure.