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H. Rauch, M. Baron, S. Filipp, Y. Hasegawa, H. Lemmel, R. Loidl:
"Hidden observables in neutron quantum interferometry";
Physica B: Condensed Matter, 385-386 (2006), 1359 - 1364.

Neutron interferometry using monolithic perfect single crystals has become an important tool for fundamental, nuclear, and solid-state
physics research. New features of quantum mechanics become measurable by means of neutron interferometry. Such features are
quantum phases, which provide a more direct access to properties of wave functions and permit wave function reconstruction, and wave
function engineering. Most recently, new experiments concerning off-diagonal and non-cyclic geometrical phases, confinement induced
phases, and contextuality related experiments have been performed. These experiments show an intrinsic entanglement of different
degrees of freedom of a single particle. Proper post-selection experiments yield to more quantum complete experiments and may help to
make quantum mechanics less mystic. Unavoidable quantum losses may play an important role to explain the transition from the
quantum to the classical world. All these investigations concern the heart of quantum mechanics and demonstrate the non-local feature
of this theory

http://dx.doi.org/10.1016/j.physb.2006.05.184