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Discrimination of physical states in quantum systems

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  • Shingu-Yano, Mayumi
  • Shibata, Fumiaki

Abstract

Quantum mechanical relaxation and decoherence processes are studied from a view point of discrimination problem of physical states. This is based on an information statistical mechanical method, where concept of a probability density and an entropy is to be generalized. We use a quasi-probability density of Q-function (Husimi function) and the corresponding entropy (Wehrl–Lieb entropy) and apply the method to a Brownian motion of an oscillator and a non-linear spin relaxation process. Our main concern lies in obtaining a discrimination probability Pd as a function of time and temperature. Quantum mechanical fluctuation causes profound effects than the thermal fluctuation.

Suggested Citation

  • Shingu-Yano, Mayumi & Shibata, Fumiaki, 2001. "Discrimination of physical states in quantum systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 293(1), pages 115-129.
    • Handle: RePEc:eee:phsmap:v:293:y:2001:i:1:p:115-129
    DOI: 10.1016/S0378-4371(00)00617-8
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