  Quantum state can be teleported to a remote site by only local measurement
and classical communication if the prior Einstein-Podolsky-Rosen quantum
channel is available between the sender and the receiver. Those quantum
channels shared by multiple nodes can constitute a quantum network. Yet,
studies on the efficiency of quantum communication between nodes of quantum
networks remain limited, which differs from classical case in that the quantum
channel will be consumed if teleportation is performed. Here, we introduce the
exclusive quantum channels (EQC) as the measure of efficiency of quantum
information transmission. It quantifies the amount of quantum information which
can be teleported between nodes in a quantum network. We show that different
types of EQC are local quantities with effective circles. Significantly,
capacity of quantum communication of quantum networks quantified by EQC is
independent of distance for the communicating nodes. Thus, the quantum network
can be dealt as the isotropic medium where quantum communication is
no-decaying. EQC are studied by both analytical and numerical methods. The EQC
can be enhanced by transformations of lattices of quantum network via
entanglement swapping. Our result opens the avenue in studying the quantum
communication of the quantum networks.
