Friday, May 29, 2020

MEASUREMENTS IN QUANTUM MECHANICS Book download PDF





The volume Measurements in Quantum Mechanics explains different aspects of measurements in quantum mechanical systems. Understanding of quantum mechanics requires a careful definition of measurement. The subject of measurement is a basic part of the problem of the interpretation of quantum mechanics, for which there is currently no consensus. It is a postulate of quantum mechanics that all measurements have an associated observable. The quantum state of a system is a mathematical object that fully describes the quantum systems. From the inception of quantum mechanics, the concept of measurement proved to be a source of difficulties that found a concrete expression in the Einstein-Bohr debates, out of which both the Einstein Podolsky Rosen paradox and the Schrödinger's cat paradox developed. In brief, the difficulties stemmed from an apparent conflict between several principles of the quantum theory of measurement. In particular, the linear dynamics of quantum mechanics seemed to conflict with the postulate that during measurement a non-linear collapse of the wave packet occurred. The measurement problem is not just an interpretational difficulty internal to quantum mechanics


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