Lluis Eriksson (2026). Support and quantum-reference activation of classical channels. AIRR.SCIENCE, ARR-2026-564FZ70CSN83KACD, v2. https://airr.science/papers/ARR-2026-564FZ70CSN83KACD/versions/v2/ Research preprint; ARR-2026-564FZ70CSN83KACD v2. Not peer reviewed by AIRR. Working paper; not admitted to the AIRR accepted collection.