Influences Of Pure Dephasing And Incoherent Pumping In A Coupled Quantum Dot-Cavity System And Its Application

Cavity quantum electrodynamics (CQED) is used to research light-matter interaction, and has been studied for several decades. At the beginning, the interaction of light with matter is modeled by a quantized single mode radiation field with a two-level atom. In recent years, motivated by the applications in quantum information science, The model of a coupled quantum dot-cavity system has been studied both theoretically and experimentally.This work was supported by the National High Technology Research and Development Program of China "GaAs-based quantum dot light-emitting materials’performance prediction and characterization for the optical communication", and the National Natural Science Foundation of China "The research of coupling of quantum dot and photonic nanocavity". This dissertation focuses on the model of a coupled quantum dot-cavity system, which considers pure dephasing, incoherent pumping and stimulated emission. The influences of pure dephasing and incoherent pumping on the coupled quantum dot-cavity system are systematically investigated.1. Under thermal bath approximation theory and Born-Markov approximation, we build a quantum dissipative master equation, which taking into account of pure dephasing, incoherent pumping and stimulated emission. The roles of pure dephasing and incoherent pumping on the spectra are investigated, respectively. We can easily come to a conclusion that pure dephasing and incoherent pumping have similar influence on the spectra.2. While in the off-resonance situation, the spectrum from coupled quantum dot-cavity can emit at the frequency of cavity by changing pure dephasing and incoherent pumping. Based on this phenomenon, a new way to realize a solid-state single photon source was provide, Then we investigate the strategies to enhance the efficiency of a single photon source.3. Under laser model approximation theory and Born-Markov approximation, we build a quantum dissipative master equation, which taking into account of pure dephasing, incoherent pumping and stimulated emission. We draw the condition of lasing regime by considering the changing of cavity population, quantum dot population and statistics of the emitted field with increasing incoherent pumping.4. Analyzing the influences of pure dephasing and system detuning on the coupled system, we find that lasing regime can be realize by changing pure dephasing and system detuning. Based on the results of simulation, the optimum allocation of the coupled system was obtained, which offers a theoretical direction in developing a stabilized and efficient single quantum dot laser.This topic goal is to explore a new way of developing an efficient frequency-stabilized single photon source and single quantum dot laser. After this stage research work, Schemes for achieving single photon source and single quantum dot laser have theoretically proposed. These results pave the road towards further experiments preparation.