In quantum theory as it is currently formulated the measurement of an observable quantity of a physical system is the occasion for a change of state of the system, except when the state prior to the measurement is an eigenstate of the observable. Two proposals for interpreting this kind of change are examined in detail, and several variant proposals are considered briefly. According to the interpretation proposed by von Neumann, and by London and Bauer the change of state is completed only when the result of the observation is registered in the observer's consciousness. Although this interpretation appears to be free from inconsistencies, it is not supported by psychological evidence and it is difficult to reconcile with the intersubjective agreement of several independent observers. According to the interpretation proposed by Bohr, the change of state is a consequence of the fundamental assumption that the description of any physical phenomenon requires reference to the experimental arrangement. Bohr's proposals are valuable as practical maxims in scientific activity, but they are shown to involve the renunciation of any ontological framework in which all types of events—physical and mental, microscopic and macroscopic—can be located. It is concluded that a satisfactory account of the observation of microphysical quantities is unlikely if the present formulation of quantum theory is rigorously maintained.
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October 1963
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October 01 1963
Role of the Observer in Quantum Theory
Abner Shimony
Abner Shimony
Department of Humanities, Massachusetts Institute of Technology, Cambridge, Massachusetts
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Am. J. Phys. 31, 755–773 (1963)
Article history
Received:
April 15 1963
Citation
Abner Shimony; Role of the Observer in Quantum Theory. Am. J. Phys. 1 October 1963; 31 (10): 755–773. https://doi.org/10.1119/1.1969073
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