Chiral dark mode for nonreciprocal transmission and asymmetric quantum state transfer in a magneto-optical hybrid system
Phys. Rev. A 113, 063718 – Published 12 June, 2026
DOI: https://doi.org/10.1103/yc3j-ffyj
Abstract
We propose a scheme to realize nonreciprocal dark modes in a coupled optomagnonic system consisting of a yttrium iron garnet (YIG) cavity and a silica cavity. Through magnon-induced Brillouin scattering, we establish a chiral optomagnonic coupling which leads to a dark mode occurring only under one propagation direction. Owing to the chiral dark mode, the system supports a nonreciprocal optical transmission channel that exhibit distinct transparency windows for leftward and rightward propagation. The system also supports an asymmetric quantum state transfer channel. Specifically, an optical quantum state prepared in one circulating direction can be coherently transferred to the magnon mode with high fidelity, while the mode in the opposite direction cannot be transferred due to the absence of the dark mode. We further identify the parameter regimes of coupling strength and dissipation that ensure high-quality state transfer. Our works introduce chiral dark modes as a quantum resource with applications in unidirectional quantum communication and quantum memory.
