2016/02/27 by Yang Gao, Gao, Yang, Ho‐Pui Ho +3
Engineering · Physics and Astronomy · #Advanced MEMS and NEMS Technologies #FOS: Physical sciences #Force Microscopy Techniques and Applications #Mechanical and Optical Resonators #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.1602.08586
openalex publication_date 2016/02/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We prove that the force sensitivity of the conventional optomechanical detector associated with the optical quadrature measurement of the output beam is lower bounded by the so-called ultimate quantum limit (UQL), i.e., the absolute value of the imaginary part of the inverse mechanical susceptibility. Through the linear response theory, we find that the force sensitivity of any linear detector is lower bounded by a generalized UQL, which might beat the usual UQL by properly tailoring the detector-oscillator interaction. We believe that our results open a new direction for improving the performance of high-sensitivity detection schemes.