Enhanced force sensitivity based on Duffing nonlinearity in a dissipatively coupled optomechanical system

Abstract

The study of force sensitivity based on a cavity optomechanical system plays a prominent role in quantum precision measurement and provides an ideal platform for precision sensing technology. Here, we propose a scheme to enhance the force sensitivity of a dissipatively coupled optomechanical system by inducing Duffing nonlinearity. The numerical analysis shows that inducing Duffing nonlinearity significantly improves the force sensitivity compared to the system without Duffing nonlinearity, even surpassing the standard quantum limit (SQL) by more than five orders of magnitude. Moreover, we demonstrated that the sensitivity of force sensing is robust to temperature when Duffing nonlinearity is induced. More interestingly, the induction of Duffing nonlinearity broadens the detection bandwidth. At the same time, the detection frequency below the SQL also experiences a significant frequency shift with changes in the nonlinear amplitude. Our scheme not only holds potential for applications in quantum manipulation but also realizes macroscopic quantum effects.