Force Sensing in an Optomechanical System with Feedback-Controlled In-Loop Light

Year: 2022

Authors: Bemani F.; Cernotik O.; Ruppert L.; Vitali D.; Filip R.

Autors Affiliation: Department of Optics, Palacke University, 17. listopadu 1192/12, Olomouc, 77146, Czechia, Czech Republic; Physics Division, School of Science and Technology, University of Camerino, (MC), Camerino, I-62032, Italy; INFN, Sezione di Perugia, via A. Pascoli, Perugia, I-06123, Italy; CNR-INO, L.go Enrico Fermi 6, Firenze, I-50125, Italy

Abstract: Quantum control techniques applied at macroscopic scales provide us with opportunities in fundamental physics and practical applications. Among them, measurement-based feedback allows efficient control of optomechanical systems and quantum-enhanced sensing. In this paper, we propose a near-resonant narrow-band force sensor with extremely low optically added noise in a membrane in the middle optomechanical system subject to a feedback-controlled in-loop light. The membrane?s intrinsic motion consisting of zero-point motion and thermal motion is affected by the added noise of measurement due to the backaction noise and imprecision noise. We show that, in the optimal low-noise regime, the system is analogous to an optomechanical system containing a near quantum-limited optical parametric amplifier coupled to an engineered reservoir interacting with the cavity. Therefore, the feedback loop enhances the mechanical response of the system to the input while keeping the optically added noise of measurement below the standard quantum limit. Moreover, the system based on feedback offers a much larger amplification bandwidth than the same system with no feedback. Without the need to hybridize it with other quantum systems or introduce nonlinearities, our force sensor may have broad applications ranging from biology and medicine to gravitational wave detection and tests of fundamental physics.


Volume: 17 (3)      Pages from: 034020-1  to: 034020-14

More Information: We thank Stefano Zippilli and Ali Motazedifard for their useful conversations. F.B. and L.R. acknowl-edge the support of project 19-22950Y of the CzechScience Foundation. O. C?. acknowledges the project CZ.02.1.01/0.0/0.0/16_026/0008460 of MEYS CR and national funding together with funding from the European Union´s Horizon 2020 (2014-2020) research and innovation framework programme under Grant Agreement No. 731473 (project 8C18003 TheBlinQC) . R.F. acknowledges the project 20-16577S of the Czech Science Foundation. D.V. acknowledges the support of the Euro-pean Union Horizon 2020 Programme for Research and Innovation through the Project QuaSeRT funded by the QuantERA ERA-NET Cofund in Quantum Technologies and the Project No. 862644 (FET Open QUARTET) .
KeyWords: quantum control; motion
DOI: 10.1103/PhysRevApplied.17.034020