Intracavity-squeezed Cooling in the via Quadratic Optomechanical Coupling with the Hybrid Optomechanical System

In this paper, a hybrid intracavity squeezing optomechanical cooling system is proposed to achieve ground state cooling. The results show that the quantum backaction heating can be completely suppressed by adding nonlinear medium. The optimal squeezing parameters are obtained so that the final phonon number is significantly less than one. It is demonstrated that the mechanical resonator can be cooled to the ground state by adjusting the parameters between the two cavities even in the unresolved sideband regime. The cooling rate is greatly faster than the linear optomechanical coupling due to the two-phonon cooling process in the quadratic coupling. In addition, the system has no strict requirements for an auxiliary cavity, which provides a new path for the subsequent research of ground state cooling.