2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/224404Physical systems have some degree of disorder present in them. We discuss how to treat natural, thermal entanglement in any random macroscopic system from which a thermodynamic witness bounded by a constant can be found. We propose that functional many-body perturbation theory be applied to allow either a quenched or an annealed average over the disorder to be taken. We find when considering the example of an XX Heisenberg spin chain with a random coupling strength, that the region of natural entanglement detected by both witnesses can be enhanced by the disorder.4 pages, 2 figures, accepted by Physical Review LettersQuantum PhysicsDisordered Systems and Neural NetworksStatistical Mechanicstext