Quantum gyroscope based on the cavity-magnon system

In this paper, we propose a quantum gyroscope scheme based on a cavity-magnon system, which enables high-precision rotation angular velocity sensing by harnessing hybrid light-magnon interactions. Central to this framework is the employment of a two-mode squeezed coherent state, generated via parametric coupling of dual quantized optical fields with collective spin excitations (magnons), which serves as the quantum metrological probe. We demonstrate that this scheme can significantly enhance the sensitivity of quantum gyroscopes beyond the shot-noise limit. Furthermore, in the non-Markovian case, the performance of the quantum gyroscope in a dissipative environment does not deteriorate over time, provided that the environmental spectral density satisfies certain conditions. Another notable advantage of the proposed quantum gyroscope lies in its ability to overcome the size constraints inherent in current quantum gyroscope designs. These findings provide critical insights for advancing miniaturized quantum gyroscopes with sub-microradian precision, addressing long-standing challenges in inertial navigation systems under strong ambient noise.