Atomic ensemble-assisted ground-state cooling of a rotating mirror in a triple Laguerre–Gaussian cavity

We propose a novel cooling protocol within a triple-Laguerre–Gaussian cavity optomechanical system, which is designed to suppress the thermal vibrations of a rotating mirror to reach its quantum ground state. The system incorporates two auxiliary cavities and an atomic ensemble coupled to a Laguerre–Gaussian rotational cavity. By carefully selecting system parameters, the cooling process of the rotating mirror is significantly enhanced, while the heating process is effectively suppressed, enabling efficient ground-state cooling even in the unresolved sideband regime. Compared to previous works, our scheme reduces the stringent restrictions on auxiliary systems, making it more experimentally feasible under broader parameter conditions. These findings provide a robust approach for achieving ground-state cooling in mechanical resonators.