Coherent Transport And Single-photon Cooperative Dynamics In Quantum Network

With the development of quantum computing and quantum information technology,there has been a growing interest in the study of controlling and manipulating microscopic quantum states.As a quantized energy entity of an electromagnetic field,photons have no direct interaction with the electromagnetic environment and have become ideal candidates for quantum information carriers.Compared with other micro-particles with mass,photons have the advantages of fast speed,large capacity,strong anti-interference ability,and good confidentiality.In recent years,the manipulation of photon states through the effective interac-tion between photons and matter has become an important development direction in quantum physics.Studies show that by placing quantum emitters in confined spaces,the interaction be-tween photons and emitters can be significantly enhanced,and the cavity electrodynamics and waveguide electrodynamics developed from them have now become two important branches in quantum optics.In waveguide electrodynamic,photons can propagate along the waveguide.According to the principles of quantum mechanics,decoherence can take place when photons are in the waveguide due to dissipation.At present,many different types of high-Q waveguides have been experimentally realized,such as photonic crystal waveguides,superconducting transmission line waveguides,nano-fibers,and surface plasmon waveguides,which provide a good platform for long-distance transmission of photons.Among these different types of waveguide systems,coupled-cavity array waveguides have gradually attracted people's attention due to their rich physical phenomena and energy spectrum structures.Research on optical switching effects,dynamics problems,bound state problems,and coherent quantum transport problems in coupled-cavity array systems can not only help people understand the quantum properties of this system,but also help design the quantum devices and quantum networks needed in quantum information processing.This dissertation consists of six chapters.In the first chapter,we briefly introduced the development of photon quantization,the devel-opment of photon coupling with quantum emitter in confined waveguides,and the physical implementation of the system.In Chapter 2,we study the system of coupled-cavity waveguides coupled by a two-level quantum emitter,and analyze the coherent transport of single photon states in one-dimensional and two-dimensional coupled-cavity arrays.In Chapter 3,we study a system in which a one-dimensional coupled-cavity waveguide is coupled with a three-level quantum emitter,and the bound states and spontaneous emissions are calculated and discussed.In Chapter 4,we study the system of one-dimensional coupled-cavity waveguide coupling with an ensemble of quantum emitter.The energy level structure and the single-photon collective dynamics are analyzed and discussed.In Chapter 5,single-photon cooperative dynamics of an ensemble of two-level quantum emitters coupled by a bosonic bath are investigated.We analyze and discuss the trapping effect of the bound and dark states in the process of collective photonic dynamics.In the last chapter,we summarize the content of the full text and make some possible prospects for the next work.