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

本研究项目的目标是研究在严格共振激励下，在微腔中自组装的InGaAs量子点的发射特性。主要的焦点集中在在连续波(CW)和脉冲相干激发下从单个量子点以及特别是空间遥远的量子点的发射中产生难以区分的光子。为了实现这些目标，通过共振激发与改变单个量子点和腔模能量之间的相对光谱失谐的新方法相结合，即使在低温下，也有望有效地减少有限的“纯”发射消相效应。互补调谐技术将被应用于可控地优化和微调QD发射相干特性，无论是在单独的还是在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的级联光子发射。额外的Hong-Ou-Mandel类型干涉研究旨在明确地确定每个单独Mollow发射边带上的光子不可分辨程度。上述研究活动是实现众多量子光学信息技术概念的重要和必要步骤，对这些概念来说，确定地产生不可分辨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.