Critical reflections on quantum probability theory*

László E. Szabó
Theoretical Physics Research Group of HAS
Department of History and Philosophy of Science
Eötvös University, Budapest

It is proved that quantum probabilities have no, in general, relative frequency interpretation. Consequently, quantum probability theory, as a probability theory, is inadequate for the description of quantum phenomena. Moreover, it is needless because all the phenomena of quantum physics can be well understood within the framework of the classical probability theory.

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* In M. Rédei, M. Stoeltzner (eds.), John von Neumann and the Foundations of Quantum Physics, Kluwer, Dordrecht, 2001.