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We present the experimental characterization of two distant double-slit masksilluminated by chaotic light, in the absence of first-order imaging andinterference. The scheme exploits second-order interference of lightpropagating through two indistinguishable pairs of {\it disjoint} optical pathspassing through the masks of interest. The proposed technique leads to a deeperunderstanding of biphoton interference and coherence, and opens the way to thedevelopment of novel schemes for retrieving information on the relativeposition and the spatial structure of distant objects, which is of interest inremote sensing, biomedical imaging, as well as monitoring of laser ablation,when first-order imaging and interference are not feasible.

Characterization of two distant double-slits by chaotic light second-order interference