Phase-covariant mixtures of non-unital qubit maps

  title={Phase-covariant mixtures of non-unital qubit maps},
  author={Katarzyna Siudzi'nska},
  journal={Journal of Physics A: Mathematical and Theoretical},
We analyze convex combinations of non-unital qubit maps that are phase-covariant. In particular, we consider the behavior of maps that combine amplitude damping, inverse amplitude damping, and pure dephasing. We show that mixing non-unital channels can result in restoring the unitality, whereas mixing commutative maps can lead to non-commutativity. For the convex combinations of Markovian semigroups, we prove that classical uncertainties cannot break quantum Markovianity. Moreover, contrary… 



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