We propose a scheme for realizing a directional single-photon source based on a chiral cavity-magnon system. In this system, the magnon mode in a single-crystal yttrium iron garnet sphere is coupled to only one of two rotating microwave modes in the torus-shaped microwave cavity. When two-photon driving fields are applied to both ports of the waveguide, the chiral cavity-magnon coupling leads to an unconventional photon blockade in one propagation direction, resulting in directional single-photon emission. The emission direction of the single-photon source can be controlled by reversing the bias magnetic field. Furthermore, we examine the effects of imperfect chiral cavity-magnon coupling and the coupling between the two cavity modes on the photon-blockade behavior. The results show that the system remains robust in the presence of these nonideal factors, and the unidirectional photon-blockade effect remains clearly preserved. Our approach may offer a different perspective for the design of unidirectional single-photon devices.

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• Quantum optics