title: Off-diagonal geometric phase in a neutron interferometer experiment.
abstract: Off-diagonal geometric phases acquired by an evolution of a 1/2-spin system have been observed by means of a polarized neutron interferometer. We have successfully measured the off-diagonal phase for noncyclic evolutions even when the diagonal geometric phase is undefined. Our data confirm theoretical predictions and the results illustrate the significance of the off-diagonal phase.
authors.affiliation: Atominstitut der Osterreichischen Universitäten, Stadionallee 2, A-1020 Wien, Austria.
authors.forename: Y
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: R
authors.initials: R
authors.lastname: Loidl
authors.forename: M
authors.initials: M
authors.lastname: Baron
authors.forename: G
authors.initials: G
authors.lastname: Badurek
authors.forename: H
authors.initials: H
authors.lastname: Rauch