Breakfast Journal Club

Observation of a quantum Cheshire Cat in a matter-wave interferometer experiment

Wednesday, 22 October 2014 from to (Europe/Vienna)
at SMI ( Meeting Room )
Top 12 Reichsratstraße 17 1010 Wien
Description From its very beginning, quantum theory has been revealing extraordinary and counter-intuitive phenomena, such as wave-particle duality, Schroödinger cats and quantum non-locality. Another paradoxical phenomenon found within the framework of quantum mechanics is the ‘quantum Cheshire Cat’: if a quantum system is subject to a certain pre- and postselection, it can behave as if a particle and its property are spatially separated. It has been suggested to employ weak measurements in order to explore the Cheshire Cat’s nature. Here we report an experiment in which we send neutrons through a perfect silicon crystal interferometer and perform weak measurements to probe the location of the particle and its magnetic moment. The experimental results suggest that the system behaves as if the neutrons go through one beam path, while their magnetic moment travels along the other.

Denkmayr, T. et al. Observation of a quantum Cheshire Cat in a matter-wave interferometer experiment. Nat. Commun. 5:4492 doi: 10.1038/ncomms5492 (2014).

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