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Prof. Dr. Klaus Hornberger Universitat Duisburg-Essen Probing the quantum superposition principle Does the quantum superposition principle hold on mesoscopic or even macroscopic scales? The tremendous success of quantum theory notwithstanding, this question remains unsettled to date. I will discuss experimental tests of the quantum superposition principle, such as matter wave interferometry with large particles as well as their implications on theories predicting a breakdown of quantum mechanics at macroscopic scales. I will also explain how the degree of macroscopicity reached in various superposition experiments can be assessed and compared. The wave nature of highly massive particles can be tested in a near-field interferometer based on standing VUV-light beams Mo. 3.11.14 16:00 Uhr Ort: H34