Efficient ground state cooling of a membrane by the combination of continuous-wave field and pulses

Abstract

We present an approach that realizes the ground state cooling of the membrane-in-middle optomechanical system. Instead of straightforwardly using the continuous-wave (CW) or pulsed external drives, we consider the combinations of them for having a more efficient cooling process. Due to the dynamical nature of the joint action of both CW and pulse fields, it is necessary to explore the real-time evolutions of the system under various conditions, from which the optimal cooling can be found. Given such setup, the cooling limit previously discovered for the simple optomechanical systems under a single CW drive can be easily broken. The achieved cooling effect indicated by a defined cooling rate is one or more order lower than the cooling limit of a simple optomechanical systems, thus providing an efficient way of ground state cooling. Furthermore, the ground state cooling can be realized for a membrane with much lower mechanical quality factor and with the external drives of the lower intensities, to considerably relax the requirements for optomechanical cooling with the current experimental technology.

We present an approach that realizes the ground state cooling of the membrane-in-middle optomechanical system. Instead of straightforwardly using the continuous-wave (CW) or pulsed external drives, we consider the combinations of them for having a more efficient cooling process. Due to the dynamical nature of the joint action of both CW and pulse fields, it is necessary to explore the real-time evolutions of the system under various conditions, from which the optimal cooling can be found. Given such setup, the cooling limit previously discovered for the simple optomechanical systems under a single CW drive can be easily broken. The achieved cooling effect indicated by a defined cooling rate is one or more order lower than the cooling limit of a simple optomechanical systems, thus providing an efficient way of ground state cooling. Furthermore, the ground state cooling can be realized for a membrane with much lower mechanical quality factor and with the external drives of the lower intensities, to considerably relax the requirements for optomechanical cooling with the current experimental technology.