  Coherence, being at the heart of interference phenomena, is found to be an
useful resource in quantum information theory. Here we want to understand
quantum coherence under the combination of two fundamentally dual processes,
viz., cloning and deleting. We found the role of quantum cloning and deletion
machines with the consumption and generation of quantum coherence. We establish
cloning as a cohering process and deletion as a decohering process. Fidelity of
the process will be shown to have connection with coherence generation and
consumption of the processes.
