Nonlocal field correlations and dynamical Casimir-Polder forces between   one excited- and two ground-state atoms
  The problem of nonlocality in the dynamical three-body Casimir-Polder interaction between an initially excited and two ground-state atoms is considered. It is shown that the nonlocal spatial correlations of the field emitted by the excited atom during the initial part of its spontaneous decay may become manifest in the three-body interaction. The observability of this new phenomenon is discussed. 
R. Passante, F. Persico, L. Rizzuto