2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/123668For a two-state quantum object interacting with a slow mesoscopic interacting spin bath, we show that a many-body solution of the bath dynamics conditioned on the quantum-object state leads to an efficient control scheme to recover the lost quantum-object coherence through disentanglement. We demonstrate the theory with the realistic problem of one electron spin in a bath of many interacting nuclear spins in a semiconductor quantum dot. The spin language is easily generalized to a quantum object in contact with a bath of interacting multi-level quantum units with the caveat that it is mesoscopic and its dynamics is slow compared with the quantum object.Revised version, with supplementary informationMesoscale and Nanoscale PhysicsQuantum Physicstext