Characterizing qubit channels in the context of quantum teleportation

We consider a scenario where party, say, Alice prepares pure two-qubit (either maximally entangled or non-maximally entangled) state and sends one half of this to another distant Bob through qubit unital non-unital) channel. Finally, the shared is used as teleportation In scenario, we focus on characterizing set channels with respect final state's efficacy resource quantum (QT) in terms maximal average fidelity deviation (fluctuation values over input states). Importantly, point out existence subset for which becomes useful universal QT (having strictly greater than classical bound having zero deviation) when initially prepared either (i.e., state) not Interestingly, latter case, show that non-unital (dissipative interactions) are more effective (non-dissipative producing states from states.