Enhancing force sensing in a squeezed optomechanical system with quantum nondemolition measurement  

作　　者：Shi-Lei Chao Zi-Hao Li Xin-You Lü 

机构地区：[1]School of Physics,Huazhong University of Science and Technology,430074 Wuhan,China

出　　处：《Communications in Theoretical Physics》2024年第1期49-60,共12页理论物理通讯（英文版）

基　　金：supported by the National Key Research and Development Program of China Grant No.2021YFA1400700;National Natural Science Foundation of China Grant No.11974125。

摘　　要：A theoretical scheme is proposed to enhance the sensitivity of force sensors with quantum nondemolition measurement(QND)in an optomechanical setup assisted by four-tone optical driving and an optical parametric amplifier(OPA).With the help of special drive,the system can be simplified as the typical type of QND for force sensing,so that the backaction noise can be evaded to surpass the standard quantum limit.Besides,the added noise can be suppressed owing to the modified optical susceptibility resulting from the OPA.By introducing two oscillators coupling with two charged bodies respectively,the signal can be enhanced with the nonlinearity caused by Coulomb interaction,while the noise presents an exponential decrease.Moreover,considering the homodyne detection effect,the range of system parameters and frequency bands will be broadened.The present investigation may provide a route toward simultaneously evading backaction noise,reducing the mechanical thermal noise,and enhancing the external signal,which can be an alternative design for sensitive devices.

关 键 词：force sensing optical parametric amplifier quantum non-demolition measurement optomechanical system 

分 类 号：O431.2[机械工程—光学工程]