New aspects of geometric phases in experiments with polarized neutrons

Autor(en)

Stephan Sponar, Jürgen Klepp, Katharina Durstberger-Rennhofer, Rudolf Loidl, Stefan Filipp, Matthias Lettner, Reinhold Bertlmann, Gerald Badurek, Helmut Rauch, Yuji Hasegawa

Abstrakt

Geometric phase phenomena have been observed with single neutrons in polarimeter and interferometer experiments. Interacting with static and time-dependent magnetic fields, the state vectors acquire a geometric phase tied to the evolution within spin subspace. In a polarimeter experiment the non-additivity of quantum phases for mixed spin input states is observed. In a Si perfect-crystal interferometer experiment appearance of geometric phases, induced by interaction with an oscillating magnetic field, is verified. The total system is characterized by an entangled state, consisting of neutron and radiation fields, governed by a Jaynes-Cummings Hamiltonian. In addition, the influence of the geometric phase on a Bell measurement, expressed by the Clauser-Horne-Shimony-Holt (CHSH) inequality, is studied. It is demonstrated that the effect of the geometric phase can be balanced by an appropriate change of Bell angles.

Organisation(en)

Physik Funktioneller Materialien, Teilchenphysik

Externe Organisation(en)

Technische Universität Wien, Eidgenössische Technische Hochschule Zürich, Max-Planck-Institut für Quantenoptik

Journal

Journal of Physics A: Mathematical and Theoretical

Band

43

Anzahl der Seiten

15

ISSN

1751-8113

DOI

https://doi.org/10.1088/1751-8113/43/35/354015

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103019 Mathematische Physik

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/new-aspects-of-geometric-phases-in-experiments-with-polarized-neutrons(bce02350-54cc-4861-a0f7-c112c56ffdc4).html