|Instituto de Ciencia de Materiales de Madrid|
|Condensed Matter Theory|
|Sigmund Kohler||home | cv | research | publications|
On the conundrum of deriving exact solutions from approximate master equationsRoland 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.
[Condensed Matter Theory]
last modified: 18.6.2018 by Sigmund Kohler