Abstract
The idea is discussed according to which, in the Heisenberg picture, the operators correspond to the dynamic properties while the density matrix corresponds to our knowledge. A simple, soluble model is made use of in order to determine in what way this idea needs to be refined and what it then tells us about the relationship of reality and physics.
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References
A. Peres, inNew Techniques and Ideas in Quantum Measurement Theory, D. M. Greenberger, ed. (New York Academy of Science, New York, 1986).
W. G. Unruh, in Ref. 1.
B. d'Espagnat,Conceptual Foundations of Quantum Mechanics, 2nd edn. (Addison-Wesley, New York, 1976).
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d'Espagnat, B. Heisenberg picture and reality. Found Phys 22, 1495–1504 (1992). https://doi.org/10.1007/BF01883736
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DOI: https://doi.org/10.1007/BF01883736