System-environment correlations and Markovian embedding of quantum non-Markovian dynamics

@article{Campbell2018SystemenvironmentCA,
  title={System-environment correlations and Markovian embedding of quantum non-Markovian dynamics},
  author={Steve Campbell and Francesco Ciccarello and G. Massimo Palma and Bassano Vacchini},
  journal={Physical Review A},
  year={2018}
}
We study the dynamics of a quantum system whose interaction with an environment is described by a collision model, i.e., the open dynamics is modeled through sequences of unitary interactions between the system and the individual constituents of the environment, termed ``ancillas,'' which are subsequently traced out. In this setting, non-Markovianity is introduced by allowing for additional unitary interactions between the ancillas. For this model, we identify the relevant system-environment… 

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