We propose a waveguide-cavity coupled system to achieve the routing ofphotons by the phases of other photons. Our router has four input ports andfour output ports. The transport of the coherent-state photons injected throughany input port can be controlled by the phases of the coherent-state photonsinjected through other input ports. This control can be achieved when the meannumbers of the routed and control photons are small enough and require noadditional control fields. Therefore, the all-optical routing of photons can beachieved at the single-photon level.
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