International Conference on Quantum Physics of Nature (QuPoN 2015) Mitschnitt einer Veranstaltung der Fakultät für Physik am Dienstag, dem 19. Mai 2015 im Großen Festsaal der Universität Wien Teil 13. Samuel Werner: "Neutron interferometry beyond Newton" Schnitt: Daniel Winkler Abstract: Gravitationally-induced quantum interference was first observed by R. Colella, A.W. Overhauser and S.A. Werner (COW) in a neutron interferometry experiment in Ann Arbor in 1975. The accuracy of that experiment was about 10%. More sophisticated versions of that experiment were carried out over the years in Columbia, Missouri. The 1998 experiment of K.C. Littrell, et al. utilized two de Broglie neutron wavelengths (harmonics of each other) simultaneously in an effort to accurately correct for the effects of bending of the silicon interferometer under its own weight. The accuracy of this experiment was about 0.2 %. But, the results for the COW phase shift differed from theory by about 0.8%. From the early days, considerable interest (and many theoretical papers) was generated by these experiments primarily focusing on the possibility of observing general relativistic (GR) contributions to the quantum phase shift. This possibility led to the atom-beam interferometry experiments of M. Kasevich and S. Chu. More recently, H. Muller, et al. have suggested that the Kasevich-Chu interferometer technique is sensitive to the gravitational redshift. This claim is controversial. I will summarize the GR predictions for the neutron experiments, and suggest a new scheme of the COW-type experiment utilizing the direct observation of the Pendellosung interference fringes, and a Si interferometer floating in a fluid of density equal to that of silicon. This idea was first proposed by Anton Zeilinger about 25 years ago. Samuel Werner ist Professor am National Institute of Standards and Technology (NIST) in Gaithersburg (Maryland). INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Introduction 00:00:12 3. Gravitationally-induced quantum interferogram 00:04:17 4. General relativistic effects 00:13:24 5. Neutron interferometry 00:20:08

Quantenphysik, Neutroneninterferometrie

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