Testing quantum nonlocality for three coupled quantum dots within optical microcavity QED

Bell's inequality for three coupled quantum dots (QDs) within a cavity QED, including Förster and exciton-phonon interactions, is investigated theoretically. For an initially entangled state, Bell's inequality is valid for certain times and violated for some other times. It is shown that the system moves from a product state to an entangled state and back again during its time evolution.