For 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.
@article{arxiv.cond-mat/0604634,
title = {Restoring Coherence Lost to a Slow Interacting Mesoscopic Bath},
author = {Wang Yao and Ren-Bao Liu and L. J. Sham},
journal= {arXiv preprint arXiv:cond-mat/0604634},
year = {2007}
}