Backaction‐Noise Suppression and System Stabilization in Double‐Mode Optomechanical Systems

Abstract

A double‐mode strategy of coherent quantum noise cancellation (CQNC) is developed to mitigate the effect of the backaction‐noise in optomechanical systems. Working under an asymmetrical configuration, the CQNC strategy of quantum interference can promote the system stabilization in addition to enhance its sensitivity in weak‐force metrology by offsetting the backaction‐noise. Through exploiting the coupling between the probe mode and the ancillary mode, the rotating‐wave term and the counter‐rotating term are found to be responsible under certain circumstances for system‐stability and noise‐suppression, respectively. They demonstrate a subtle compromise between the resonant noise cancellation ratio and the effective damping rate. This strategy can be carried out in optomechanical setups with a membrane in the middle or a twisted‐cavity‐based weak‐torque detector.

Backaction Evading and Amplification of Weak Force Signal in an Optomechanical System

“…Consequently, weak force can be well discriminated. Different from previous works, [17,36] we do not require the two optical modes to ensure noise path cancellation, but the squeezing of mechanical mode is needed. Comparing with squeezed cavity field system [16,37] and mechanical parametric driven system, [28,38] thermal noise of MO is reduced in current scheme.…”

“…[6] In the OMSs, with the increasing pumping power, the competition between the shot noise and backaction noise leads to the standard quantum limit (SQL). [7] To overcome the SQL, various schemes have been proposed, including two-tone measurements, [8][9][10] negative mass, [11][12][13] atomic assistance in a separate cavity, [14] the coherent quantum noise cancellation, [15][16][17] and so on.…”

“…In quantum precision measurements with OMSs, backaction noise resulting from the optomechanical coupling is larger than shot noise originating from cavity input noise. So, much efforts mainly focus on overcoming backaction noise, [8][9][10][11][12][13][14][15][16][27][28][29][30] for example, introducing an "anti-noise" path to cancel the backaction noise, [11,16,17] squeezing backaction noise. [27][28][29] However, the introducing an "anti-noise" path also brings an added thermal noise.…”

Homodyne coherent quantum noise cancellation in a hybrid optomechanical force sensor

“…Various strategies have been proposed for suppressing the BA noise effects to achieve an ultrasensitive measurement [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]. Among them, coherent quantum noise cancella- * motazedifard.ali@gmail.com tion (CQNC) [54,55] is one of the most successful approaches of noise suppression which utilizes quantum interference.…”