Quantum Coherent Control Of Diamond Tin Vacancy Color Center Optical Bistability

The interaction between laser field and matter is the essential cause of many optical phenomena.The quantum coherence induced by laser field will lead to significant changes in the absorption,dispersion and nonlinear properties of the medium.Therefore,quantum coherence has always been the core and focus of nonlinear optics and quantum optics.In recent years,all-optical switching and all-optical storage devices based on optical bistability in various quantum systems have been extensively investigated both theoretically and experimentally.As a new kind of dot defect color center,diamond tin-vacancy color center plays a key role in solid-state quantum information and quantum computation.Therefore,it is of practical significance to study the optical bistability of the solid-state quantum system for realizing all-optical bistable switching or coding element on the solid-state platform.In this paper,based on the principle of electromagnetically induced transparency,optical bistability behaviors are theoretically investigated in a diamond tin-vacancy color center system.The main content of the paper is divided into the following parts:In the first part,the research progress and current situation of optical bistability and diamond dot defect color center are mainly introduced,which highlights the advantages of optical bistability research in the solid-state quantum system of diamond tin-vacancy color center.In the second part,the theoretical basis of the interaction between light and matter is described in detail,which is the theoretical background of realizing the optical bistability of diamond tin-vacancy color center controlled by quantum coherence.The contents of this part are mainly divided into the following sections:interaction picture in quantum mechanics,electric dipole approximation,rotating wave approximation,slowly varying envelope approximation,probability amplitude method,density matrix method,the principle of electromagnetically induced transparency and the theory of light propagation in media.In the third part,the basic concept,the generation mechanism and the semiclassical theory of optical bistability are introduced.Then,based on the principle of electromagnetically induced transparency,optical bistability behaviors are theoretically investigated in a diamond tin-vacancy color center system.It is showed that by changing the parameters of the system,such as the detunings of the probe field,the detunings and intensities of the coupling fields,the quantum coherence characteristics of the system can be significantly changed,and the threshold of the optical bistability of the solid-state system can be effectively adjusted.In addition,by properly adjusting the intensity of the coupled laser field,the mutual transformation of optical bistability and multistability can be realized.In the fourth part,we summarize the whole paper and look forward to the great application of optical bistability in the future.