  We consider two non-Markovian models: Random Telegraph Noise (RTN) and
non-Markovian dephasing (NMD). The memory in these models is studied from the
perspective of quantum Fisher information flow. This is found to be consistent
with the other well known witnesses of non-Markovianity. The two noise channels
are characterized quantum information theoretically by studying their gate and
channel fidelities. Further, the quantum coherence and its balance with
mixedness is studied. This helps to put in perspective the role that the two
noise channels can play in various facets of quantum information processing and
quantum communication.
