%0 Journal Article %T Quantum interferometry with complex molecules %A Markus Arndt %A Klaus Hornberger %J Physics %D 2009 %I arXiv %X This chapter reviews recent experiments on matter wave interferometry with large molecules. Starting from an elementary introduction to matter wave physics we discuss far-field diffraction and near-field interferometry with thermally excited many-body systems. We describe the constraints imposed by decoherence and dephasing effects, and present an outlook to the future challenges in macromolecule and cluster interferometry. %U http://arxiv.org/abs/0903.1614v1