John von Neumann and the Foundations of Quantum Physics
Volume 8 of the series Vienna Circle Institute Yearbook [2000] pp 6374
Von Neumann’s Theory of Quantum Measurement
 Jeffrey BubAffiliated withPhilosophy Department, University of Maryland
Abstract
I said quantum physicists bother very little about accounting, according to the accepted law, for the supposed change of the wavefunction by measurement. I know of only one attempt in this direction, to which Dr. Balazs recently directed my attention. You find it in John von Neumann’s wellknown book. With great acuity he constructs one analytical example. It does not refer to any actual experiment, it is purely analytical. He indicates in a simple case a supplementary operator which, when added to the internal wave operator, would with any desired approximation turn the wave function as time goes on into an eigenfunction of the observable that is measured. He found it necessary to show that such a mechanism is analytically possible. The idea has not been taken up and worked out since — in about twenty years or more. Indeed I do not think it would pay. I do not believe any real measuring device is of this kind. ([1], p. 83)
 Title
 Von Neumann’s Theory of Quantum Measurement
 Book Title
 John von Neumann and the Foundations of Quantum Physics
 Book Part
 A
 Pages
 pp 6374
 Copyright
 2001
 DOI
 10.1007/9789401720120_5
 Print ISBN
 9789048156511
 Online ISBN
 9789401720120
 Series Title
 Vienna Circle Institute Yearbook [2000]
 Series Volume
 8
 Series Subtitle
 Institut ‘Wiener Kreis’ Society for the Advancement of the Scientific World Conception
 Series ISSN
 09296328
 Publisher
 Springer Netherlands
 Copyright Holder
 Springer Science+Business Media Dordrecht
 Additional Links
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 Industry Sectors
 eBook Packages
 Editors

 Miklós Rédei ^{(2)}
 Michael Stöltzner ^{(3)}
 Editor Affiliations

 2. Eötvös University
 3. Institute Vienna Circle, Vienna, University of Salzburg
 Authors

 Jeffrey Bub ^{(4)}
 Author Affiliations

 4. Philosophy Department, University of Maryland, College Park, MD, 20742, USA
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