Nonreciprocal Conversion in Microwave Optomechanical Ring Resonator via Synthetic Magnetisms

ABSTRACT

We propose a hybrid microwave‐optomechanical system enabling high‐efficiency, nonreciprocal conversion between optical and microwave modes. The design combines a superconducting microwave cavity (MC) capacitively coupled to a mechanically compliant ring resonator, which is side‐coupled to two optical waveguides. Synthetic magnetism, induced by phase‐controlled optomechanical interactions, breaks time‐reversal symmetry to achieve directional energy transfer. By optimizing pump detuning, power, and phase, we demonstrate reconfigurable nonreciprocity with >90% conversion efficiency and low noise, supporting bidirectional mode conversion. The system further functions as a tunable multimode circulator when mechanical damping rates are engineered. Our work provides a scalable platform for integrated quantum networks and microwave‐photonic interfaces, supported by a predictive theoretical framework for parameter optimization.