Quantum Langevin equation from forward--backward path integral

Details Quantum Langevin equation from forward--backward path integral Quantum Langevin equation from forward--backward path integral

1995-03-02

arxiv.org/abs/quant-ph/9503004v1

Phys.Lett. A200 (1995) 224-232

Physics

Quantum Physics

Scientific paper

10.1016/0375-9601(95)00169-4

The quantum Langevin equation is derived from the Feynman-Veron forward--backward path integral representation for a density matrix of a quantum system in a thermal oscillator bath. We exhibit the mechanism by which the classical, $c$-valued noise in the Feynman-Vernon theory turns into an operator-valued quantum noise fulfilling characteristic commutation relation necessary for the unitarity of the time evolution in the quantum Langevin equation.

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