Enhancing Exceptional‐Point‐Based Sensing via Pump Gain in Reversed‐Dissipation Cavity Optomechanics

Abstract An enhancing exceptional‐point‐based (EP‐based) sensing scheme with the pump gain in the reversed‐dissipation regime is proposed. It is showed that EP‐based sensing has excellent signal‐to‐noise ratio (SNR) at the balanced total gain and loss. Meanwhile, this scheme is adaptable to a wide range of sensing targets represented by the perturbations, encompassing the isolated resonance, the loss (gain), and the coupling mechanism. Compared with conventional sensing schemes, this scheme significantly boosts the sensitivity coefficient across all types of perturbations, especially in small perturbations. Particularly, the readout process can be simplified for perturbations involving loss (gain) and coupling mechanism. Moreover, the robustness against noise for EP‐based sensing is confirmed through an analysis of the output spectra. This work reveals the condition for realizing the EP‐based sensing in reversed‐dissipation regime, and paves the way for the development of multifunctional and high‐sensitivity sensors within various non‐Hermitian quantum systems. It also opens new avenues for the creation of compact, integrated, and readout‐friendly optomechanical sensors.