Tunable single-photon nonreciprocal scattering and targeted router in a giant atom-waveguide system with chiral couplings

We investigate the single-photon scattering properties of a driven three-level giant atom chirally coupled to two waveguides simultaneously in both the Markovian and the non-Markovian regimes. It is shown that under the Markovian limit, the chiral photon-atom interactions enable nonreciprocal scattering in a single waveguide and targeted photon routing with a probability of 100% in two waveguides, while the presence of the driving field and the giant atom structure introduce a more tunable parameter to manipulate the single-photon scattering behaviors. We also examine how the non-reciprocity and routing capability are influenced by the imperfect chirality and the atomic dissipation. In the non-Markovian regime, we show that the scattering behaviors are more complicated. The non-Markovicity induced non-reciprocity and photon routing are demonstrated in this paper. We believe that those results have potential applications in quantum network engineering.

Automated summary

In this study, we investigate the scattering properties of a driven three-level giant atom chirally coupled to two waveguides simultaneously in both the Markovian and non-Markovian regimes. We show that under the Markovian limit, the chiral photon-atom interactions allow for nonreciprocal scattering in one waveguide and targeted photon routing in two waveguides with a probability of 100%. The presence of the driving field and giant atom structure introduce additional tunable parameters for manipulating single-photon scattering. We also explore the effects of imperfect chirality and atomic dissipation on non-reciprocity and routing capability. In the non-Markovian regime, we demonstrate non-Markovian-induced non-reciprocity and photon routing. These results have potential applications in quantum network engineering.