Physics – Quantum Physics
Scientific paper
1998-02-03
Int.J.Theor.Phys. 37 (1998) 241-247
Physics
Quantum Physics
8 pages, LaTeX, Contribution to the Quantum Structures Conference, Berlin, 1996
Scientific paper
The quantum measurement problem is formulated in the form of an insolubility theorem that states the impossibility of obtaining, for all available object preparations, a mixture of states of the compound object and apparatus system that would represent definite pointer positions. A proof is given that comprises arbitrary object observables, whether sharp or unsharp, and besides sharp pointer observables a certain class of unsharp pointers, namely, those allowing for the property of pointer value definiteness. A recent result of H. Stein is applied to allow for the possibility that a given measurement may not be applicable to all possible object states but only to a subset of them. The question is raised whether the statement of the insolubility theorem remains true for genuinely unsharp observables. This gives rise to a precise notion of unsharp objectification.
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