Emission characteristics of the resonance fluorescence of semiconductor quantum dots in microcavities

本研究的目的是研究微腔中InGaAs量子点在严格共振激发下的发光特性。主要的焦点是从单量子点的发射以及特别是在连续波（cw）和脉冲相干激发下的空间远程量子点的产生不可区分的光子。为了实现这些目标，预期通过共振激发结合新方法来有效减少限制“纯”发射退相效应，以改变单个量子点与腔模式能量之间的相对光谱失谐，即使在低温下。互补调谐技术将被应用于可控地优化和精细调整QD发射相干特性个别和远程发射器结构之间。特别是在强共振激发下，通过近共振泵浦下的光子相关测量，证明了两个Mollow三重态边带之间的确定性级联光子发射。附加的Hong-Ou-Mandel型干涉研究旨在明确地确定每个单独的Mollow发射边带上的光子不可逆性的程度。上述研究活动代表了实现许多量子光学信息技术概念的重要和必要步骤，其中确定性地产生不可区分的光子是一个基本要求。

The goal of the current research project is the investigation of the emission characteristics of self assembled InGaAs quantum dots (QDs) in microcavities under strictly resonant excitation. The main focus is set on the generation of indistinguishable photons from the emission of single quantum dots as well as particularly spatially remote QDs under continuous wave (cw) and pulsed coherent excitation. To achieve these goals, an efficient reduction of limiting ‘pure’ emission dephasing effects is anticipated by resonant excitation in combination with new methods to alter the relative spectral detuning between individual quantum dots and the cavity mode energy even at low temperatures. Complementary tuning techniques will be applied to controllably optimize and fine adjust the QD emission coherence properties individuallyand also between remote emitter structures. Especially for the regime of strong resonant excitation it is aimed to proof also the deterministic cascaded photon emission between the two Mollow triplet sidebands by photon correlation measurements under close to resonant pumping. Additional Hong-Ou-Mandel type interference studies are intended to explicitly determine the degree of photon indistinguishability on each individual Mollow emission sideband. The above explained research activities represent important and necessary steps towards the realization of numerous quantum-optical information technological concepts, for which the deterministic generation of indistinguishable photons is a fundamental requirement.