Phys. Rev. A 35, 3156–3158 (1987)Approach to equilibrium of a quantum-mechanical systemReceived 26 August 1985; published in the issue dated April 1987 A path-integral formalism is used to describe a quantum system weakly coupled to a heat bath. The heat bath is described by a set of harmonic oscillators, which can be integrated out of the functional integral. The remaining functional integral shows how the quantum system approaches thermal equilibrium. © 1987 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.35.3156
DOI:
10.1103/PhysRevA.35.3156
PACS:
05.30.-d
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