We demonstrate the possibility of designing efficient, non reciprocalfew-photon devices by exploiting the chiral coupling between two waveguidemodes and a single quantum emitter. We show how this system can inducenon-reciprocal photon transport at the single-photon level and act as anoptical diode. Afterwards, we also show how the same system shows atransistor-like behaviour for a two-photon input. The efficiency in both casesis shown to be large for feasible experimental implementations. Our resultsillustrate the potential of chiral waveguide-emitter couplings for applicationsin quantum circuitry.
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