Force-induced Transparency And Quantum Steering In Double-cavity Optomechanical System

Cavity optomechanics focuses on the interaction between optical fields and mechanical systems.In recent years,with the development of nanofabrication processes and semiconductor technology,the quality of devices for optomechanical system has improved enormously.Different from previous superconducting system and cavity atomic system,cavity optomechanical system is easy to regulate,has higher degree of integration and lower dissipation rate.Due to these advantages,cavity optomechanical system has become an important research platform for fundamental physics and applied science.In particular,in the field of quantum optics and quantum information,scientists have conducted research related to the regulation of the optical field by mechanical oscillators,the preparation of non-classical states and the cooling of the ground state based on cavity optomechanical system.Early research focused on single cavity optomechanical system,using a single cavity field coupled to a mechanical oscillator for related studies.Recently,it has been found that the nonlinear effect or quantum interference effect between cavity fields can be used to bring about many interesting physical phenomena if the multimode cavity optomechanical system is considered.In this paper,we mainly consider whether we can provide a new research scheme for optomechanical induced transparency,quantum entanglement and quantum steering based on the nonlinear effect or quantum interference effect in double-cavity optomechanical system.Specific studies have shown as:In Chapter 1,we firstly introduce the development of quantum physics.Then,the research history and research directions of cavity optomechanics and several typical optomechanical systems are presented.Finally,the research history,research overview and main criteria of quantum steering also are presented.In Chapter 2,we mainly investigate force-induced transparency in double-cavity optomechanical system.The system model consists of two mutually coupled optical cavities with a mechanical oscillator attached to one end,on which a constant external force is applied.Firstly,we briefly analyse the physical mechanisms that achieve force-induced transparency.Then,the influence of system parameters such as external constant force,detuning,coupling strength and decay rate on force-induced transparency is considered.It is shown that detuning affects the position of the sideband mode.Moreover,coupling strength and decay rate can change the width and depth of transparent window.More importantly,the absorption profile in the system can be tunable between double window transparency,single window transparency or absorption structure by adjusting the external force.Furthermore,the conversion between fast and slow light is also realized by adjusting the external force.In Chapter 3,we mainly investigate quantum steering and quantum entanglement in hybrid cavity optomechanical system.The system model consists of an optical cavity,a microwave cavity and a mechanical oscillator,with the optical cavity and microwave cavity coupled to a mechanical resonator respectively.The influence of system parameters such as the detuning,coupling strength and decay rate on quantum entanglement and quantum steering is discussed.It is found that the direction of one-way steering can be changed or the transition between one-way steering and two-way steering can be realized by adjusting decay rate of the cavity field.In addition,quantum entanglement and quantum steering in the system can be maximized when the coupling strength meets certain conditions.Especially,the system with large detuning is more robust to thermal noise,which makes it possible to realize quantum entanglement and quantum steering at higher temperature.In Chapter 4,we provide a brief summary of the article’s research and some prospects for later research.At present,the theoretical and experimental research of cavity optomechanics are in a rapid development stage.In the field of modern quantum technology,the optomechanical technology has wide application prospect and great research value.In this paper,some simple theoretical studies have been carried out based on cavity optomechanical system,and the study of more complex systems needs to be further explored.