(color online) (a) Atom–nanowire coupling system. Two grey terminated horizontal lines represent two individual terminal nanowires, and the small red circle denotes an N-type four-level emitter, as shown in panel (b). (c) Schematic diagram of single-photon interconnector. The dotted rectangle represents the coupling system of (a). Two optical devices A and B are connected to the interconnector through two dielectric waveguides.