Testing quantum nonlocality for three coupled quantum dots within   optical microcavity QED
  Bell's inequality in three coupled quantum dots (QDs) within cavity QED, including Forster 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 a entangled state and back again during it's time evolution. 
Shahpoor Moradi and Sassan Moradi
quant-ph