Distinguishing quantum erasure from non-local interference

Chaotic beams, generated via spontaneous parametric down conversion, do not always generate first-order interference. However, fringes can be observed in the coincidence count regime, when associated entangled beams are properly measured in separate contexts. This phenomenon can be interpreted either in terms of quantum erasure (recovered first-order interference), or in terms of non-local interference (fourth-order effects in superposition). The two explanations lead to different predictions for a specific context, which is described in the text