Research On Photon Emission Features Based On Guantum Dot-bimodal Cavity Coupling System

All optical information processing,as a key technology in high speed optical network,optical computing and optical communication,has attracted wide attention.The system which is built on the basis of the device has the advantages of low energy consumption,large capacity,high performance,high integration,high reliability and.It has rich and extensive application scenarios and development space in the field of photonic information,integrated photonics,and the preparation of integrated optical devices and photonic computers.In this paper,the quantum dot and bimodal cavity coupling system is analyzed.The main works and innovations are as follows:1.Bimodal cavity system coupled with a two level quantum dot system is studied.Two laser beams with different phase difference are used to stimulate the quantum dots and optical microcavity at the same time.The optical properties of the system are analyzed.Sub Poisson distribution light and super Poisson distribution light are obtained in the same system.On the one hand,in the driven cavity mode,due to the quantum interference effect,we obtain a low second-order coherence function,which means the system can be used for single photon emission.On the other hand,because of the coupling between the dot and cavity,the other cavity mode will produce bunching light.Based on this theory,we can merely adjust the appropriate excitation parameters,including the phase difference between lasers and excitation intensity,so as to control the property of the system's outgoing light.2.Bimodal cavity system coupled with a four level quantum dot system is studied.We make full use of the complex level of the four level quantum dot and the various transition paths provided by the two modes of the bimodal.We put forward a solution for the integration of single photon source and two-photon source for the first time.We have designed an optical system in theory.Under specific and controllable external conditions,the system can transmit single photons or photons pairs on demand.Based on the comparison and selection of system parameters and considering the actual production process conditions,we can get an ideal value of evaluating photon emission efficiency for the preparation of single photons and photon pairs.Especially for single photons,we also give consideration to the purity of the single photons and the number of photons in the cavity,so that the system can adapt to the actual production.In addition,we further study the density operator matrix of the system,compare the characteristics of photon pairs emitted from the two modes of the cavity,and we propose a hybrid excitation scheme,which cannot only control the two-photon polarization state,but also design logic gate based on the system.To summary,based on the bimodal cavity coupled with a quantum dot system,we will study the photon emission features of the system,and design a stable and reliable integrated light source device in low photon number regime.