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We analyze scenarios in which pairs of Unruh-DeWitt-like detectors interactwith scalar field(s) with bi-linear and quadratic coupling. For all cases --real scalar fields, charged scalar fields, and even for couplings mixing twodifferent scalar fields -- we find that the detectors' dynamics depends on theWightman function of a real scalar field with the same functional form up to aconstant multiple. Consequently, entanglement harvesting exhibits lowsensitivity to either the kind of scalar field or their charged nature.Furthermore, we show on general grounds that pairs of Unruh-DeWitt-likedetectors exhibit persistent divergences when they interact with scalarfield(s) with a quadratic or bi-linear coupling and discuss possible avenues toimprove the models through the regularization of such divergences.

Entanglement harvesting from multiple massless scalar fields and divergences in Unruh-DeWitt detector models