Quantum Coherence,Squeezing And Its Optical Properties Based On The Hybrid Cavity Optical System

In recent years,the cavity optomechanical system effectively combines optical modes with mechanical modes in the field of quantum to explore the interaction between light and matter,which has attracted extensive attention in the academic community.The traditional cavity optomechanical system consists of a mechanical vibrator and an optical microcavity.By manipulating the radiation pressure between the light field and the mechanical vibrator,it is mainly used to detect small changes in the force and displacement of the mechanical vibrator of the system.With the continuous advancement of manufacturing processes,many micro-nano structures such as Bose Einstein condensates,quantum dots,N-V color centers,nanospheres,microcantilevers and so on are gradually introduced into the microcavities to form a hybrid cavity optomechanical system.As an effective research platform from the classic to the quantum field,the study of the ground state cooling,precision measurement,quantum information storage,preparation of non-classical quantum coherence and squeezing state of mechanical vibrators in the hybrid cavity optomechanical system has been explored,and the application value has been gradually highlighted.Compared with the traditional cavity optomechanical system,we propose two kinds of hybrid cavity optomechanical systems in this paper.By selecting suitable parameters of the systems,the quantum coherence,squeezing and optical response characteristics in the hybrid cavity optomechanical systems are studied.The specific research contents are as follows:(1)Based on the direct coupling of the optical mode and mechanical mode in the traditional cavity optomechanical system,we trap the Bose ultracold atoms in the optical microcavity,and propose a hybrid cavity optomechanical system that indirectly regulates the coupling of the light field and the mechanical vibrator through the atomic ensemble as an intermediary.In this system,we analyzed in detail the coherence and squeezing characteristics of macroscopic mechanical vibrator,as well as the coherence and output spectral properties of the optical field.We found that as the distance between the mechanical vibrator and the atomic ensemble decreases,i.e.,the vacuum coupling strength increases of the system,the quantum coherence in the optomechanical system can be transferred from the optical field to the mechanical vibrator.Moreover,the quantum squeezing of the mechanical vibrator and output spectrum of optical field can be obtained.(2)Based on the recent research progress of the hybrid cavity array,we theoretically proposed a hybrid four-mode coupled optomechanical system to explore the effect of the mechanical vibrator on the optical properties of the optical trimer system.We find that when approaching the boundary of the stable and unstable regimes,with the tunneling strength between the optical cavities decreases or the gain ratio of the gain cavity increases,the optical characteristics of optical trimer system at the resonance detuning can be changed from strong absorption to strong amplification.Further,when the mechanical oscillator is coupled to the trimer system,it is found that the intermediate resonance peak of the optical characteristic curve of the four-mode optomechanical system is split and an optomechanically induced transparency window appears.In the four-mode optomechanical system,when the tunneling strength between the optical cavities or the gain rate of the gain cavity is changed,the optical transparent behavior of system at the resonance detuning does not change.However,the split peaks caused by the optomechanical coupling can appear the strong absorption and amplification phenomenon.