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

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

URL: http://arxiv.org/abs/2201.11425v1
Date: Thu, 27 Jan 2022 10:23:16 GMT
Title: Unambiguous joint detection of spatially separated properties of a single photon in the two arms of an interferometer
Authors: Surya Narayan Sahoo, Sanchari Chakraborti, Som Kanjilal, Dipankar Home, Alex Matzkin, Urbasi Sinha
Abstract summary: The quantum superposition principle implies that a particle entering an interferometer evolves by simultaneously taking both arms. For a fixed state measured at the output port, certain particle properties can be associated with only one or the other path. We report observation of the spatial and polarization degrees of freedom of a single photon in the two arms of an interferometer.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: The quantum superposition principle implies that a particle entering an interferometer evolves by simultaneously taking both arms. If a non-destructive, minimally-disturbing interaction coupling a particle property to a pointer is implemented on each arm while maintaining the path superposition, quantum theory predicts that, for a fixed state measured at the output port, certain particle properties can be associated with only one or the other path. Here we report realization of this prediction through joint observation of the spatial and polarization degrees of freedom of a single photon in the two arms of an interferometer. Significant pointer shifts ($\sim$50 microns) are observed in each arm. This observation, involving coupling distinct properties of a quantum system in spatially separated regions, opens new possibilities for quantum information protocols and for tests of quantumness for mesoscopic systems.

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