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The concept of wave-particle duality, which is a key element of quantumtheory, has been remarkably found to manifest itself in several experimentalrealizations as in the famous double-slit experiment. In this specific case, asingle particle seems to travel through two separated slits simultaneously.Nevertheless, it is never possible to measure it in both slits, which naturallyappears as a manifestation of the collapse postulate. In this respect, onecould as well ask if it is possible to "perceive" the presence of the particleat the two slits simultaneously, once its collapse could be avoided. In thisarticle, we use the recently proposed entanglement mediation protocol toprovide a positive answer to this question. It is shown that a photon whichbehaves like a wave, i.e., which seems to be present in two distant locationsat the same time, can modify two existing physical realities in theselocations. Calculations of the "weak trace" left by such photon also enforcethe validity of the present argumentation.

How a single particle modifies the physical reality of two distant others simultaneously: a quantum nonlocality and weak value study