Completely positive master equation for arbitrary driving and small level spacing

@article{Mozgunov2020CompletelyPM,
  title={Completely positive master equation for arbitrary driving and small level spacing},
  author={Evgeny Mozgunov and Daniel A. Lidar},
  journal={Quantum},
  year={2020},
  volume={4},
  pages={227}
}
Markovian master equations are a ubiquitous tool in the study of open quantum systems, but deriving them from first principles involves a series of compromises. On the one hand, the Redfield equation is valid for fast environments (whose correlation function decays much faster than the system relaxation time) regardless of the relative strength of the coupling to the system Hamiltonian, but is notoriously non-completely-positive. On the other hand, the Davies equation preserves complete… 

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