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.
Original language | English |
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Pages (from-to) | 419-422 |
Number of pages | 4 |
Journal | Zeitschrift für Physik B Condensed Matter and Quanta |
Volume | 34 |
Issue number | 4 |
DOIs | |
State | Published - Dec 1979 |
Externally published | Yes |