Observation of nonadditive mixed-state phases with polarized neutrons.
In a neutron polarimetry experiment the mixed-state relative phases between spin eigenstates are determined from the maxima and minima of measured intensity oscillations. We consider evolutions leading to purely geometric, purely dynamical, and combined phases. It is experimentally demonstrated that the sum of the individually determined geometric and dynamical phases is not equal to the associated total phase which is obtained from a single measurement, unless the system is in a pure state.
Klepp
Jürgen
J
Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria.
Sponar
Stephan
S
Filipp
Stefan
S
Lettner
Matthias
M
Badurek
Gerald
G
Hasegawa
Yuji
Y