Measurement in Quantum Theory
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Description: Study of the details and some of the implications of the measurement problem. By Henry Krips of the University of Pittsburgh.
Measurement in Quantum Theory (Stanford Encyclopedia of Philosophy) First published Tue Oct 12, 1999; substantive revision Wed Aug 22, 2007 From the inception of Quantum Mechanics (QM) the concept of measurement proved a source of difficulties that found concrete expression in the Einstein-Bohr debates, out of which both the Einstein Podolsky Rosen paradox and 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. David Albert puts the problem nicely when he says:
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