Non-classical neutron beams for fundamental and solid state research |
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Authors: | H Rauch |
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Institution: | (1) Atominstitut der Oesterreichischen Universitaeten, 1020 Wien, Austria |
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Abstract: | The curious dual nature of the neutron, sometimes a particle, sometimes a wave, is wonderfully manifested in the various non-local
interference and quantum contextuality effects observed in neutron interferometry. Non-classical states may become useful
for novel fundamental and solid state research. Here we discuss unavoidable quantum losses as they appear in neutron phase-echo
and spin rotation experiments and we show how entanglement effects in a single particle system demonstrate quantum contextuality.
In all cases of interactions, parasitic beams are produced which cannot be recombined completely with the original beam. This
means that a complete reconstruction of the original state would, in principle, be impossible which causes a kind of intrinsic
irreversibility. Even small interaction potentials can have huge effects when they are applied in quantum Zeno-like experiments.
Recently, it has been shown that an entanglement between external and internal degrees of freedom exists even in single particle
systems. This contextuality phenomenon also shows that a quantum system carries much more information than usually extracted.
The path towards advanced neutron quantum optics will be discussed.
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Keywords: | Neutron interferometer neutron optics quantum optics matter waves |
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