The Study Of Optical Chaos And Quantum Phenomena Of Phonon In The Hybrid Optomechanical System

With the increase of the importance of photons and phonons in information science,people derive "optomechanics".The research object of this subject is the optomechanical system,which consists of an optical cavity and a mechanical oscillator through radiation pressure.In the optomechanical system,we can study the classical and quantum effects via linear and nonlinear interaction,such as:high order sideband,optomechanically induce transparency,chaos,photon entanglement and photon blockade,et al.But for phonons,we can just observe the classical and linear quantum behaviors,because the optomechanical interaction is very weak.Therefore,in order to comprehensively study the linear and nonlinear quantum behaviors of phonons,we couple optomechanical system to other systems to form hybrid optomechanical systems.In the hybrid optomechanical systems,not only the effects of photons,but the various quantum behaviors of phonons can also be observed comparing with the standard optomechanical system.Simultaneously,they also reduce the difficulty and improve the controllability of the experiment.This paper is main about the optical chaos,phonon entanglement and phonon blockade in the hybrid systems.The content is also the research topic during my PhD.In the following I will introduce content of my research.1.We study a hybrid optomechanical system,in which a microwave oscillator couples to the optomechanical system,and get the controllable optical chaos.The result shows that:we can effectively regulate the life of chaos by adjusting the intensity,frequency and phase of the electric driving;comparing with the standard optomechanical system,electric hybrid optomechanical system greatly reduces the optical driving threshold needed for chaotic(two orders of magnitude lower).This scheme provides a new method-electric field to control the optical chaos.Optical chaos can be used to make a chaotic laser;meanwhile,it may offer the prospect of exploring the controllable chaos in on-chip optoelectronic devices and its applications in secret communication.2.In the same way,through study the hybrid optomechanical system,which consists of a microwave oscillator and an optomechanical system,we get a strong steady-state phonon entanglement.The research shows that:the entanglement degree can exceed the steady-state entanglement limit,ln2;the entangled state has very high purity,and is robust against the thermal fluctions(the thermal occupation number is10~1magnitude);using this entangled state as a source to transfer information,we can get a high fidelity.Such a stable entangled state can be used to transmit information with high fidelity.3.In a hybrid optomechanical system consisting of a two-level atom and an optomechanical system,we study the unconventional phonon blockade via the effectively enhanced atom-phonon interaction.Analysis revealed:the atom-phonon interaction can also enhanced by adding one more optomechanical cavity,in this case,unconventional phonon blockade can also be observed.We provide a much more reasonable method to observe phonon antibunching in experiment.Single-phonon quantum technology has potential application in producing single phonon logic devices,building hybrid quantum networks and quantum devices on engineering chips.In conclusion,the above is the main content about the classical and quantum control in the hybrid systems.