Quantum force sensing using backaction noise suppression in optomechanical system
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RESEARCH ARTICLE
Quantum force sensing using backaction noise suppression in optomechanical system Tesfay Gebremariam Tesfahannes1 • Mengistu Markos Tsanger2
Received: 8 April 2020 / Accepted: 16 September 2020 Ó The Optical Society of India 2020
Abstract In this paper, we investigate the quantum force sensing in a single optomechanical system by the use of a coherent quantum noise cancellation scheme. The system consists of a Fabry–Pe´rot cavity simultaneously coupled to a mechanical oscillator and an ensemble of atom. Accordingly, the dynamics of the systems are studied by utilizing the quantum Langevin equations approach. It is found that the backaction noise can be eliminated from coherent quantum noise cancellation. Remarkably, we examine a force sensor that uses coherent noise cancellation to beat the standard quantum limit. We also investigate the effect of coherent transitions to atomic noise suppresses, and these simultaneous processes can significantly enhance the performance of the quantum force sensor. Our scheme can be generalized to other hybrid optomechanical systems, and these results may have spectacular applications for the realization of the quantum force sensor. Keywords Quantum force sensor Standard quantum limit Optomechanical system Coherent quantum noise cancellation
& Tesfay Gebremariam Tesfahannes [email protected] Mengistu Markos Tsanger [email protected] 1
Department of Physics, Arba Minch University, Arba Minch 21, Ethiopia
2
Department of Physics, Kamba Secondary and Preparatory School, Gamo Zone, Ethiopia
Introduction Quantum noise of light introduces sensing errors because it is unknown to the observer and induces fundamental limits [1]. This allows searching a method of noise suppression is an essential ingredient in realizing the large-scale architecture of quantum information processing [2]. Recently, several sophisticated quantum noise reduction schemes have been proposed to overcome the standard quantum limit [3, 4]. For instance, coherent quantum noise cancellation (CQNC) schemes have been introduced [5–7], in which the anti-noise path can be canceling the original noise [8, 9]. The measurement of weak forces at the quantum limit [10] and the search for quantum behavior in microscopic degrees of freedom have been some of the motivations for the basis of the development of cavity optomechanics [11, 12]. In a force measurement based on an optomechanical scheme [13], the competition between shot noise and radiation pressure backaction noise leads to the notion of Standard Quantum Limit (SQL) [14, 15]. The sensitivity of force sensors in optomechanical is limited by the thermal noise acting on the mechanical oscillator, the shot noise of the input laser beam, and the radiation pressures backaction noise [16]. The exchange of imprecise measurements due to backaction noise and the photon shot noise leads to the standard quantum limit [17]. In particular, the shot noise is a known effect limiting high precision interferometry at high frequencies, wh
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