Quantum State Reduction: An Operational Approach

Details Quantum State Reduction: An Operational Approach Quantum State Reduction: An Operational Approach

1997-11-07

arxiv.org/abs/quant-ph/9711006v1

Fortschr.Phys.46:615,1998

Physics

Quantum Physics

12 pages, LaTeX, no figures, Fundamental problems in quantum theory workshop (August 1997, Baltimore), invited lecture

Scientific paper

A rigorous theory of quantum state reduction, the state change of the measured system caused by a measurement conditional upon the outcome of measurement, is developed fully within quantum mechanics without leading to the vicious circle relative to the von Neumann chain. For the basis of the theory, the local measurement theorem provides the joint probability distribution for the outcomes of local successive measurements on a noninteracting entangled system without assuming the projection postulate, and the quantum Bayes principle enables us to determine operationally the quantum state from a given information on the outcome of measurement.

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