Lluis Eriksson (2026). Orthogonal Measurements Maximize All-Degree Born Rigidity among Equal-Trace Rank-One POVM Orbits in Dimension Five and Above. AIRR.SCIENCE, ARR-2026-0DZQ2WNKPW8GCTPA, v1. https://airr.science/papers/ARR-2026-0DZQ2WNKPW8GCTPA/versions/v1/ Archived manuscript; ARR-2026-0DZQ2WNKPW8GCTPA v1. Not peer reviewed by AIRR. Historical import; not assessed by AIRR.