Lluis Eriksson (2026). Linear Fisher information from a probe coupled to an inaccessible quantum memory. AIRR.SCIENCE, ARR-2026-7NZJA12AH89H3AKM, v1. https://airr.science/papers/ARR-2026-7NZJA12AH89H3AKM/versions/v1/ Research preprint; ARR-2026-7NZJA12AH89H3AKM v1. Not peer reviewed by AIRR. Working paper; not admitted to the AIRR accepted collection.