How three stories starting 100 years ago, combine on the optical table: Relativity, QM and the SG experiment

Matter-wave interferometry provides an excellent tool for fundamental studies as well as technological applications. In our group, several interferometry experiments have been done with a BEC on an atom chip. I will give a brief description of the advantages of the atom chip, and will then present how the atom chip and matter-wave interferometry enable to combine three 100-year-old topics: Relativity (Gravity), QM (Superposition) and the SG experiment (Spin). I will conclude with an outlook concerning ideas for possible tests of exotic physics such as quantum gravity, and mention several speculations which we hope to examine in the future.