理論セミナー

日時: 2015-02-03 15:30 - 16:30
場所: 研究本館3階セミナールーム322
会議名: Weak-values of neutrons in double-slit experiment --- quantum Cheshire-Cat and weak-value as a complex number ---
連絡先: 森田 辰弥、moritata-AT-post.kek.jp
講演者: 長谷川 祐司氏  (ウィーン工科大学)
講演言語: 英語
アブストラクト: 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. For instance, an experiment is carried out recently, 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. In addition, we carried out an experiment to determine weak-value of 1/2-spin as a complex number: experimental results agree well with theoretical prediction. In my talk, I am going to give an overview of activities of weak-value/measurement. Then, I am going to explain neutron ineterferometric experiments concerning two aspects of weak-value/measurement.
References:
J. Erhart et al., Nature Phys. 8, 185 (2012).
T. Denkmayr et al., Nat. Comm. (2014) DOI: 10.1038/ncomms5492.

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