Nonreciprocal Photon Blockade in an Asymmetric Cavity

We propose a scheme to realize tunable and strong nonreciprocal photon blockade (PB) in an asymmetric Fabry‐Pérot cavity. The setup consists of a single‐mode optical cavity trapping a two‐level atom, with the cavity coherently driven by a laser and the atom pumped by an auxiliary control field of the same frequency. By engineering quantum interference between multiple excitation pathways by adjusting the amplitude and relative phase of the control laser, we identify two distinct optimal control conditions that enable directional suppression of two‐photon states. Under optimal control conditions, strong nonreciprocal PB is achieved, with a nonreciprocal ratio exceeding 30 dB over a broad operational bandwidth. The proposed protocol requires only standard coherent laser sources and is compatible with current cavity QED experimental setups, offering a practical and scalable platform for nonreciprocal quantum photonics.