Instituto de Ciencia de Materiales de Madrid
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On the conundrum of deriving exact solutions from approximate master equations

Roland Doll, David Zueco, Martijn Wubs, Sigmund Kohler, and Peter Hänggi
Chem. Phys. 347, 243 (2008)

We derive the exact time-evolution for a general quantum system under the influence of a bosonic bath that causes pure phase-noise and demonstrate that for a Gaussian initial state of the bath, the exact result can be obtained also within a perturbative time-local master equation approach already in second order of the system-bath coupling strength. We reveal that this equivalence holds if the initial state of the bath can be mapped to a Gaussian phase-space distribution function. Moreover, we discuss the relation to the standard Bloch-Redfield approach.
arXiv:0707.3938 [quant-ph]

[ICMM-CSIC] [Condensed Matter Theory]
last modified: 23.11.2017 by Sigmund Kohler