We propose a potentially practical scheme for the controllable single-photon transport via waveguides which are coupled to a microcavity–emitter system. The microcavity–emitter system consists of a V-type three-level emitter and two or one single-mode microcavity. A driving field is used to drive a hyperfine transition between two upper excited states of the V-type three-level emitter. Beyond chiral coupling between waveguides and microcavity–emitter system, we show that the perfectly nonreciprocal single-photon transport in a single waveguide and the single-photon router with 100% routing probability in two waveguides can be achieved. Interesting enough, whether the nonreciprocal single-photon transport or the single-photon router can be switched periodically by adjusting the phase associated with microcavity–emitter coupling strength and the driving field. The complete physical explanation of the underlying mechanism is presented.

我们提出了一种潜在的实用方案，用于通过耦合到微腔-发射器系统的波导进行可控单光子传输。微腔-发射器系统由一个V型三能级发射器和两个或一个单模微腔组成。驱动场用于驱动 V 型三能级发射器的两个上激发态之间的超精细跃迁。除了波导和微腔-发射器系统之间的手征耦合之外，我们还证明了在单个波导中的完美单光子传输和在两个波导中具有 100% 路由概率的单光子路由器是可以实现的。够有趣的，通过调整与微腔-发射极耦合强度和驱动场相关的相位，是否可以周期性地切换非互易单光子传输或单光子路由器。给出了底层机制的完整物理解释。