  We exploit controlled breaking of time-reversal symmetry to realize coherent
routing of quantum information in spin networks. The key component of our
scheme is a spin triangle whose chirality is determined by the quantum state of
a control qubit which thus defines the propagation direction, or a
superposition thereof, of the quantum information. We then consider a
particular realization of a coherent router using Rydberg atoms. Our results
can facilitate scalable quantum information processing and communication in
large arrays of Rydberg atoms.
