Abstract
On the basis of the many-Hilbert-space approach to quantum measurements, we reformulate the notion of wave-function collapse as a dephasing process, without making use of von Neumann's projection postulate. A “detector” is described as an open quantum system, characterized by thermodynamical properties, and endowed with a many-Hilbert-space structure: These features enable us to provoke decoherence and to perform quantum measurements. Our approach is compared to other Copenhagen-based theories in some detail.
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