Cavity-Assisted Generation Of Single Photons In Semiconductor Quantum Dots

The Stimulated Raman Adiabatic Passage(STIRAP) is an important technique in controlling the atomic or quantum dot’s states and it has been widely used in manipulation, population transfer among quantum states of atoms or quantum dots, preparation of a quantum states and deterministic single-photon source. The quantum dot-cavity coupled system is being more and more used as a single-photon dot source with the STIRAP happened in it. We utilize cavity quantum electrodynamics theory to solve the main equation of this system, thus analyze the process of generating single-photons and characteristics of the single-photon source.This dissertation focus on the STIRAP in the quantum dot-cavity coupled system. Taken several dissipation factors into account, we analyze the characteristics of this single-photon source.1. We solve the main equation of the system in Quantum Trajectory Method, without taking phonon scatterings into consideration, and estimate the influence of detunings and cavity leakage to the population transfer efficiency. We also find a way to optimize the Pump pulse to offset the negative effects of the scattering channels.2. When take phonon scatterings into account, we find that the system is reset to the initial state after the emission of a photon, and there is a small possibility that the system would emit a second photon.3. The waveform of the single photon generated from the system is analyzed. We find that we can control the waveform of the emitted photon by turning the shape of the Pump pulse.The aim of this dissertation is to explore a new and deterministic way of generating single-photons. Schemes for realizing single-photon source is theoretically proposed in this dissertation. We also come up with a way to control the waveform of the single-photon. All of these results can build up a solid foundation towards further experiments preparation.