Optomechanical force sensor in a non-Markovian regime

Abstract

An optomechanical force sensor for a mechanical oscillator in a non-Markovian environment is presented. By performing homodyne detection, we obtain a general expression for the output signal. It is shown that the weak force detection is sensitive to the non-Markovian environment. The additional noise can be reduced and the mechanical sensitivity can be obviously amplified compared to the Markovian condition even in resolved sideband regimes without using assistant systems or squeezing. Our results provide a promising platform for improving the sensitivity of weak-force ultrasensitive detection.

Quantum-correlation-enhanced weak-field detection in an optomechanical system

“…The minimum additional noise S min has a valley value along with the increase of the linear coupling coefficient, and appears at G = 0.02ω m . When G < 0.02ω m , S min decreases with the increase of G. When G > 0.02ω m , S min increases with the increase of G. This phenomenon is due to the existence of a dependent relationship between the feedback noise and the shot noise, which is dependent on the linearized coupling strength, which have been studied in recent researches [2]. As shown in Fig.…”

Nonreciprocal interference and coherent photon routing in a three-port optomechanical system

“…In optomechanics, mechanical motions can interact with optical modes in a large range of frequencies via radiation pressure. Such interactions, which are intrinsically nonlinear but can be linearized and enhanced via strong optical drivings, lead to a host of important applications such as ground-state cooling of mechanical resonators [3,4], precise sensing [1,[5][6][7][8], and entanglement generation [9,10]. On one hand, one can manipulate mechanical motions and prepare quantum states for mechanical modes via optomechanical interactions [11][12][13].…”

Strong Squeezing of Duffing Oscillator in a Highly Dissipative Optomechanical Cavity System

“…Optomechanical system with the coupling between a cavity field and a macroscopic mechanical oscillator provides us a perfect platform for testing the quantum properties of macroscopic objects, such as macroscopic entanglement, [ 1–8 ] macroscopic steering, [ 9–11 ] macroscopic superposition, [ 12–14 ] macroscopic state transfer, [ 15,16 ] and macroscopic mechanical squeezing. [ 17–23 ] Meanwhile, due to the connection of mechanical motion and cavity field, optomechanical system can be used for high‐precision measurements, for instance ultrasensitive force detection, [ 24–26 ] angular velocity detection, [ 27,28 ] small quantities of adsorbed mass detection, [ 29–31 ] and gravitational wave detection. [ 32–34 ] In the field of high‐precision measurements, optomechanical squeezing, that is, optical squeezing [ 35–38 ] or mechanical squeezing [ 39–41 ] can effectively improve the precision detection; therefore realizing the squeezing of mechanical mode in optomechanical system is significant for its potential applications.…”