Quantum theory as the most important physical theory of the 20th century has to have its place in the school curriculum. For most teachers quantum physics seems to be quite abstract and hence difficult to understand for their pupils. However, concentration on essential aspects as superposition or uncertainty opens up teaching paths that equally lead to an understanding of the most important traits of quantum theory as well as to its relevance to world view. Possible approachesand related activities will be presented during the workshop. The approaches use the simplest possible systems: two-state quantum objects. They rely on the polarisation properties of light. These are visualized with aid of java applets. An other central notion is the term "information". The implications are demonstrated in an experiment building on the classical double slit experiment and visualizing the discussion on the so-called which way information with aid of different polarization. Also a so-called quantum eraser can be built. The discussed version of the double slit experiment allows for building on the pupils' pre-knowledge from optics. Furthermore the experimental device can easily be built by the pupils themselves. It is reported on results of experimentation activities and learning success in classroom.
