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The quantum superposition principle implies that a particle entering aninterferometer evolves by simultaneously taking both arms. If anon-destructive, minimally-disturbing interaction coupling a particle propertyto a pointer is implemented on each arm while maintaining the pathsuperposition, quantum theory predicts that, for a fixed state measured at theoutput port, certain particle properties can be associated with only one or theother path. Here we report realization of this prediction through jointobservation of the spatial and polarization degrees of freedom of a singlephoton in the two arms of an interferometer. Significant pointer shifts($\sim$50 microns) are observed in each arm. This observation, involvingcoupling distinct properties of a quantum system in spatially separatedregions, opens new possibilities for quantum information protocols and fortests of quantumness for mesoscopic systems.

Unambiguous joint detection of spatially separated properties of a single photon in the two arms of an interferometer