2007, Vol.10, No.1, pp.102-104
For a classical system which is out of equilibrium, under the proper definition,
the entropy production is shown to satisfy a
fluctuation theorem symmetry. In this paper, for
an externally driven quantum mechanical system which linearly couples to a harmonic
reservoir, the probability density for relative entropy production is explicitly
calculated and shown to be non-Gaussian. We reveal that non-Gaussian nature of the
relative entropy production is purely
quantum-mechanical. From the exact form of probability density of relative entropy
production, quantum extension of fluctuation theorem is derived.
Key words:
quantum fluctuation theorem, non-Gaussian fluctuation,
entropy
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