  Mixing dynamical maps describing open quantum systems can lead from Markovian
to non-Markovian processes. Being surprising and counter-intuitive, this result
has been used as argument against characterization of non-Markovianity in terms
of information exchange. Here, we demonstrate that, quite the contrary, mixing
can be understood in a natural way which is fully consistent with existing
theories of memory effects. In particular, we show how mixing-induced
non-Markovianity can be interpreted in terms of the distinguishability of
quantum states, system-environment correlations and the information flow
between system and environment.
