Contextual particle propagation in a three-path interferometer

Abstract

Quantum information is based on the apparent contradictions between classical logic and quantum coherence described by Kochen-Specker contextuality. Surprisingly, this contradiction can be demonstrated in a comparatively simple three-path interferometer, where it is impossible to trace the path of a single photon through five consecutive stages of the interferometer. Here, I discuss the paradoxical aspects of single photon interferences revealed by the three-path interferometer and point out the essential role of dynamics in quantum information.

arXiv commentFour pages, including three figures. Contribution to the proceedings of QIT49, held December 17th to December 19th 2023 at OIST, Okinawa, Japan