Casimir-Polder potentials as entanglement probe
  We have considered the interaction of a pair of spatially separated two-level atoms with the electromagnetic field in its vacuum state and we have analyzed the amount of entanglement induced between the two atoms by the non local field fluctuations. This has allowed us to characterize the quantum nature of the non local correlations of the electromagnetic field vacuum state as well as to link the induced quantum entanglement with Casimir-Polder potentials. 
Markus.A.Cirone, Giuseppe Compagno, G. Massimo Palma, Roberto Passante   and Francesco S. Persico