Summary
Coherent superposition of states is responsible for any interference phenomena. Recent neutron interferometry experiments based on postselection methods renewed the discussion about quantum non-locality and the quantum measuring process. It has been shown that interference phenomena can be revived even when the overall contrast of an interference experiment vanishes. This indicates a persisting coupling in phase space even in cases of spatially separated Schrödinger-cat-like situations. More complete quantum experiments also show that a complete retrieval of quantum states behind an interaction area becomes impossible in principle, which indicates that the irreversible quantum measuring process starts with the first interaction of the quantum system already.
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Rauch, H. Superposition experiments in neutron interferometry. Nuov Cim B 110, 557–569 (1995). https://doi.org/10.1007/BF02741465
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DOI: https://doi.org/10.1007/BF02741465
PACS
PACS
PACS
PACS
- 61.12.Gz
- Neutron diffraction techniques (e.g., powder, single crystal, energy dispersive, and pulsed neutron source methods)