If we reduce coherence in a given quantum system, the result is an increase in entropy. Does this necessarily convert this quantum system into a classical system? The answer to this question is No. The decrease of coherence means more uncertainty. This does not seem to make the system closer to classical system where there are no uncertainties. We examine the problem using two coupled harmonic oscillators where we make observations on one of them while the other oscillator is assumed to be unobservable or to be in Feynman’s rest of the universe. Our ignorance about the rest of the universe causes an increase in entropy. However, does the system act like a classical system? The answer is again No. When and how does this system appear like a classical system? It is shown that this paradox can be resolved only if measurements are taken along the normal coordinates. It is also shown that Feynman’s parton picture is one concrete physical example of this decoherence mechanism.
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29 May 2001
BAYESIAN INFERENCE AND MAXIMUM ENTROPY METHODS IN SCIENCE AND ENGINEERING: 20th International Workshop
8-13 July 2000
Gif-sur-Yvette (France)
Research Article|
May 29 2001
Feynman’s entropy and decoherence mechanism Available to Purchase
Y. S. Kim
Y. S. Kim
Department of Physics, University of Maryland, College Park, Maryland 20742
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Y. S. Kim
Department of Physics, University of Maryland, College Park, Maryland 20742
AIP Conf. Proc. 568, 409–417 (2001)
Citation
Y. S. Kim; Feynman’s entropy and decoherence mechanism. AIP Conf. Proc. 29 May 2001; 568 (1): 409–417. https://doi.org/10.1063/1.1381903
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