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Decoherence in continuous measurements: From models to phenomenology

  • Part II. Invited Papers Dedicated to Mikio Namiki
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Abstract

Decoherence is the name for the complex of phenomena leading to appearance of classical features of quantum systems. In the present paper decoherence in continuous measurements is analyzed with the help of restricted path integrals (RPI) and (equivalently in simple cases) complex Hamiltonians. A continuous measurement results in a readout giving information in the classical form on the evolution of the measured quantum system. The quantum features of the system reveal themselves in the variation of possible measurement readouts. For example, the monitoring energy of a multi-level system may visualize a transition between levels as a process evolving in time but with an unavoidable quantum noise. Decoherence of a continuously measured system is completely determined by the measurement readout, i.e., by the information recorded in its environment. It is shown that the ideology of RPI makes the Feynman version of quantum mechanics closed, contrary to the conventional operator form of quantum mechanics which needs quantum theory of measurement as a necessary additional part.

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Authors and Affiliations

  1. P. N. Lebedev Physical Institute, 117924, Moscow, Russia

    Michael B. Mensky

  2. Fakultät für Physik der Universität Konstanz, Postfach 5560 M 674, D-78434, Konstanz, Germany

    Michael B. Mensky

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Mensky, M.B. Decoherence in continuous measurements: From models to phenomenology. Found Phys 27, 1637–1654 (1997). https://doi.org/10.1007/BF02551442

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  • DOI: https://doi.org/10.1007/BF02551442

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