Quantum Physics with Neutrons: From Spinor Symmetry to Kochen-Specker Phenomena |
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Authors: | Helmut Rauch |
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Institution: | 1. Atominstitut, Vienna University of Technology, Stadionallee 2, 1020, Wien, Austria
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Abstract: | In 1974 perfect crystal interferometry has been developed and immediately afterwards the 4π-symmetry of spinor wave-functions has been verified. The new method opened a new access to the observation of intrinsic quantum
phenomena. Spin-superposition, quantum state reconstruction and quantum beat effects are examples of such investigations.
In this connection efforts have been made to separate and measure various dynamical and geometrical phases. Non-cyclic and
non-adiabatic topological phases have been identified and their stability against various fluctuations and dissipative forces
has been investigated by means of ultra-cold neutrons. An entanglement between different degrees of freedom of a single neutron
system demonstrated the contextuality feature of quantum mechanics. In its continuation this yields to Kochen-Specker theorem
like investigations providing a new basis for information processing and for the understanding of quantum physics in general.
All investigations show the equivalence of various phase spaces and show how physical phenomena are correlated by quantum
laws. Some curiosa occurred during the experiments and some epistemological aspects will be discussed as well. |
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