Interference-induced directional emission from an unpolarized two-level emitter into a circulating cavity

Chiral coupling between quantum emitters and evanescent fields allows directional emission into nanophotonic devices is now considered to be a vital ingredient for the realization of networks. However, such requires well-defined circular dipole moment emitter---something difficult achieve solid-state at room temperature due thermal population available spin states. Here, we demonstrate that two-level emitter with randomly polarized can made emit directionally circulating cavity if separate chirally coupled same cavity, case when both emitter-cavity couplings are strong but in bad-cavity regime. Our analysis this system first considers transient scenario, which highlights physical mechanism giving rise cavity. An alternative setup involving weak laser field continuously driving also considered, where directionality (our proposed figure merit scheme) shown significantly more robust against noise processes. The results presented here take form approximate analytical expressions backed by complete numerical simulations system.