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Non-classical and stimulated photon emission processes from semiconductor nanostructures Peter Michler Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart During the last few years remarkable progress has been achieved in the development of single and coupled semiconductor quantum dots and high-quality micro-cavities which might open the way for new applications in the field of quantum information processing. Here we demonstrate triggered polarization-entangled photon pair emission from a single quantum dot up to temperatures of 30 K. The fidelity of the maximally entangled state decreases only little from 72 % at 5 K to 68 % at 30 K. This is especially encouraging for future implementations in practical devices. We report inter-dot electron coupling on laterally coupled (In,Ga)As QDs. The degree of tunnel coupling can be controlled by applying a static electric field along the quantum dot molecule (QDM) axis. By applying a voltage the electron probability can be reversibly shifted to either QD, and the QDM can be used to create a wavelength-tunable single photon emitter. Furthermore, we present systematic first-order coherence measurements of high-β quantum-dot micro-pillar lasers. Our results show a strong influence of the β-factor on the coherence properties of the emitted light and reveal a correlation of the coherence length with the spontaneous emission coupling β.