Wave function collapse: Difference between revisions

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Beginning in 1970 [[H. Dieter Zeh]] sought a detailed [[quantum decoherence]] model for the discontinuous change without postulating collapse. Further work by [[Wojciech H. Zurek]] in 1980 lead eventually to a large number of papers on many aspects of the concept.<ref>{{Cite journal |last=Camilleri |first=Kristian |date=2009-12-01 |title=A history of entanglement: Decoherence and the interpretation problem |url=https://www.sciencedirect.com/science/article/pii/S1355219809000562 |journal=Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics |series=On The History Of The Quantum |volume=40 |issue=4 |pages=290–302 |doi=10.1016/j.shpsb.2009.09.003 |issn=1355-2198}}</ref> Decoherence assumes that every quantum system interacts quantum mechanically with its environment and such interaction is not separable from the system, a concept called an "open system".<ref name=SchlosshauerReview/>{{rp|1273}} Decoherence has been shown to work very quickly and within a minimal environment, but as yet it has not succeeded in a providing a detailed model replacing the collapse postulate of orthodox quantum mechanics.<ref name=SchlosshauerReview/>{{rp|1302}}

By explicitly dealing with the interaction of object and measuring instrument, von Neumann<ref name="Grundlagen"/> described a quantum mechanical measurement scheme consistent with wave function collapse. However, he did not prove the ''necessity'' of such a collapse. Although vonVon Neumann's projection postulate is often presented as a normative description of quantum measurement, it was conceived bybased taking into accounton experimental evidence available during the 1930s, (in particular [[Compton scattering]] was paradigmatic). Later work discussedrefined so-calledthe measurementsnotion of measurements into the more easily discussed ''secondfirst kind'', that is to say measurements that will not give the same value when immediately repeated, as opposed to the more easily discussed measurements ofand the ''firstsecond kind'', whichthat willgive different values when repeated.<ref>

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|author=W. Pauli