Nonlinear Effects Of Optical Microcavity And Its Application In Quantum Information

In recent years,in the research of quantum information and quantum computing,effective manipulation of single qubits has become a key issue to be solved.For the effective manipulation of single qubits,an efficient interface between light and matter is required.The optical microcavity enhances the interaction of light and matter by virtue of a higher quality factor(Q)and a smaller mode volume(V).It has great potential for application in the enhancement of light-matter interaction.This doctoral thesis takes optical microcavity system as the research object,mainly studies the nonlinear effect in microcavity and its application in quantum information.The main results and innovations are as follows:First,the nonlinear effects in microcavity systems are studied.The high-order sideband generation process in the optomechanical system which has parity-time symmetry is analytically analyzed.In the surface plasmon waveguide and cavity coupling system,the mechanism of electromagnetic-induced transparency is analyzed.A method for distinguishing Autler-Townes splitting and electromagnetic-induced transparency is proposed.Second,the application of optical microcavity in quantum information is studied.We constructed a hybrid system of diamond nitrogen-vacancy color center and whispering-gallery-mode optical microcavity,and analyzed the nonlinear interaction between the solid-state qubit and the optical microcavity.The hybrid system enables entanglement concentration,universal high-dimensional quantum logic gates for controlled-flipping operations and high-dimensional Bell state analysis.Third,the experimental study of the effective coupling between the integrated optical microcavity and optical fiber.A high-quality factor lithium niobate microring cavity was fabricated,and a double-layer reverse tapered mode size converter was designed.The coupling loss during fiber-to-waveguide coupling was reduced from 14dB to 3.4dB,thus solving the inefficient coupling problems between integrated optical microcavities and optical networks.