Off-diagonal geometric phase in a neutron interferometer experiment.
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.
Hasegawa
Y
Y
Atominstitut der Osterreichischen Universitäten, Stadionallee 2, A-1020 Wien, Austria.
Loidl
R
R
Baron
M
M
Badurek
G
G
Rauch
H
H