Summary
In the conventional formulation of quantum mechanics, a measurement is an interaction between a quantum object and a classical apparatus. The quantum motions of the object dynamically induce the apparatus into a classical path (e.g., into a reading). The rules for computing the induced apparatus Lagrangians are here discussed.
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References
See, for example,Quantum Theory and Measurement, edited byJ. A. Wheeler andW. H. Zurek (Princeton University Press, Princeton, N.J., 1983).
For N. Bohr’s discussions with A. Einstein on epistemological problems in atomic physics, see Chapt. 7 ofAlbert Einstein: Philosopher Scientist, Vol. 7 of theLibrary of Living Philosophers, edited byP. A. Schlipp (Evanston, Ill., 1949) (reprinted by Open Court, La Salle, Ill., 1970).
L. Landau andE. M. Lifshitz:Statistical Physics, second edition (Addison Wesley Publishing Co., Reading, Mass., 1969), p. 28.
The quantum dynamics of ferromagnetic grains illustrating some of the general formalism presented here can be found in a recent work:Quantum electrodynamic circuit theory of measurements on ferromagnetic grains byA. Widom andY. Srivastava:Nuovo Cimento B,103, 185 (1989).
For a recent review, seeY. Srivastava andA. Widom:Phys. Rep.,148, 1 (1987).
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Widom, A., Srivastava, Y. Lagrangian formulation of Bohr’s measurement theory. Nuov Cim B 107, 71–75 (1992). https://doi.org/10.1007/BF02726886
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DOI: https://doi.org/10.1007/BF02726886