S. Sponar, J. Klepp, Y. Hasegawa, E. Jericha, G. Badurek
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Non-cyclic geometric phases in mixed state neutron polarimetry
We have measured the non-cyclic geometric phase acquired during a unitary SU(2) evolution of a neutron spinor wave function for the mixed state case. The data is in good agreement with theory, verifying the predicted values for the mixed state geometric phase.