Polarization is a significant vector property of the light field that has been widely applied in various fields of modern optical sciences. In this paper, we introduce the concept of polarization into the cavity-magnomechanical system as a platform for studying quantum coherence in the vector regime. Interestingly, we find that quantum coherence can be flexibly and continuously controlled by adjusting the polarization angle of the optical polarizer and implementing coherent switching and role reversal between the two types of photon-magnon-phonon coherences for the transverse electric and transverse magnetic modes. More importantly, this coherent conversion characteristic of quantum coherence exhibits strong robustness to environmental temperature and dissipation channels. In practice, this ability to switch macroscopic quantum coherence would provide another degree of freedom for quantum information science based on the cavity-magnomechanical system. In addition, the experimental feasibility of the polarization-controlled quantum coherence is evaluated, and the strategy for detecting vector quantum coherence is discussed briefly.

• Received 12 October 2023
• Revised 19 January 2024
• Accepted 23 January 2024

DOI:https://doi.org/10.1103/PhysRevB.109.064412