  Inside computer networks, different information processing tasks are
necessary to deliver the user data efficiently. This processing can also be
done in the quantum domain. We present simple optical quantum networks where
the orbital angular momentum of a single photon is used as an ancillary degree
of freedom which controls decisions at the network level. Linear optical
elements are enough to provide important network primitives like multiplexing
and routing. First we show how to build a simple multiplexer and demultiplexer
which combine photonic qubits and separate them again at the receiver. We also
give two different self-routing networks where the OAM of an input photon is
enough to make it find its desired destination.
