Abstract
In the literature one finds several different Markov approximations for a quantum system weakly coupled to a thermal reservoir. We want to point out that, in general, only the rigorous approximation given by E.B. Davies preserves positivity.
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Dümcke, R., Spohn, H. The proper form of the generator in the weak coupling limit. Z Physik B 34, 419–422 (1979). https://doi.org/10.1007/BF01325208
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DOI: https://doi.org/10.1007/BF01325208