A measure of non-Markovianity for unital quantum dynamical maps

  title={A measure of non-Markovianity for unital quantum dynamical maps},
  author={Soroush Haseli and S. Salimi and A. S. Khorashad},
  journal={Quantum Information Processing},
One of the most important topics in the study of the dynamics of open quantum systems is the information exchange between system and environment. Based on the features of back-flow information from an environment to a system, an approach is provided to detect non-Markovianity for unital dynamical maps. The method takes advantage of non-contraction property of the von Neumann entropy under completely positive and trace-preserving unital maps. Accordingly, for the dynamics of a single qubit as an… 
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