  The reliability of quantum channels for transmitting information is of
profound importance from the perspective of quantum information. This naturally
leads to the question as how well a quantum state is preserved when subjected
to a quantum channel. We propose a measure of quantumness of channels based on
non-commutativity of quantum states that is intuitive and easy to compute. We
apply the proposed measure to some well known noise channels, both Markovian as
well as non-Markovian and find that the results are in good agreement with
those from a recently introduced $l_1$-norm coherence based measure.
