Restoring coherence lost to a slow interacting mesoscopic spin bath.
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 can be easily generalized to a quantum object in contact with a bath of interacting multilevel quantum units with the caveat that the bath is mesoscopic and its dynamics is slow compared with the quantum object.
Yao
Wang
W
Department of Physics, University of California San Diego, La Jolla, California 92093-0319, USA.
Liu
Ren-Bao
RB
Sham
L J
LJ