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The 60th Photo-molecular Science Forum

Lecture Title "Foundation of quantum mechanics explored with neutrons －new uncertainty-relation and Quantum Cheshire-Cat－"
Date Monday 16 February 2015 16:00 to 17:30
Lecturer Yuji HASEGAWA (Ass. Prof. Dr., Atominstitut, Technical University of Vienna,)
Place

Institute for Molecular Science, Research Building, Seminar Room, #201
Summary

Quantum mechanics predicts that particles like neutrons can exhibit non-local wave properties in certain circumstances. The neutron interferometer with a monolithic structure of a silicon perfect crystal is invented in 1974 and is used for a variety of experiments studying foundation of quantum mechanics with matter-waves. Our group in Vienna is promoting neutron optical experiments, i.e., neutron interferometery and polarimetry: both experiments manifest the validity of quantum mechanical predictions with high precision. Recently, an experiment is carried out, which deals with error-disturbance uncertainty relation: we have experimentally tested error-disturbance uncertainty relations. Experimental results confirm the fact that the Heisenberg's uncertainty relation is often violated and that the new relation derived by Ozawa is always larger than the limit. In addition, as an example of a counterfactual phenomenon of quantum mechanics, observation of so-called quantum Cheshire Cat is performed experimentally by using neutron interferometer. Experimental results suggest that pre- and post-selected neutrons travel through one of the arms of the interferometer while their magnetic moment is located in the other arm. I am going to explain these two topics.

References:
J. Erhart et al., Nature Phys. 8, 185 (2012).
T. Denkmayr et al., Nat. Comm. (2014) DOI: 10.1038/ncomms5492.
Contact

Yutaka Shikano, Kenji Ohmori
Awards & Honors International collaboration

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