Anti-distinguishability of quantum channels

arXiv:2611.04105v1 Announce Type: new Abstract: We study single-query perfect anti-distinguishability/exclusion tasks of finite quantum channel ensembles, primarily using associated Choi operators and process POVMs. Weak perfect anti-distinguishability requires each measurement outcome to exclude an ensemble candidate with certainty, whereas the strong form additionally requires every candidate to have an exclusion outcome occurring with non-zero probability. For pairs of channels, both coincide with perfect distinguishability, whereas larger ensembles exhibit separations.