Dressed bound states at chiral exceptional points

Atom-photon dressed states are a basic concept of quantum optics. Here, we demonstrate that the non-Hermiticity open cavity can be harnessed to form bound (DBS) and identify two types DBS, vacancy-like DBS Friedrich-Wintgen in microring resonator operating at chiral exceptional point. With analytical conditions, show occurs when an atom couples standing wave mode is node photonic function, thus immune dissipation characterized by null spectral density resonance. While accessed continuously tuning system parameters, such as atom-photon detuning, evidenced vanishing Rabi peak emission spectrum, unusual feature strong-coupling anticrossing. We also quantum-optics applications proposed DBS. Our work exhibits control through presents clear physical picture on points, which holds great potential building high-performance devices for sensing, photon storage, nonclassical light generation.