10.18453/rosdok_id00000913 Kiesel, Thomas Thomas Kiesel http://d-nb.info/gnd/1017025266 Universität Rostock 2011 530 Physics 2011 en http://purl.uni-rostock.de/rosdok/id00000913 urn:nbn:de:gbv:28-diss2011-0145-7 Nonclassicality was introduced to examine if experimental observations can be explained with a classical theory. Although the formal definition of nonclassicality is known for several decades, there has been a lack of simple and complete criteria to check nonclassicality. In this work, some criteria are compared. Then, so-called nonclassicality quasiprobabilities are introduced, which allow a full examination of nonclassicality for any quantum state. Finally, some issues of the relation between nonclassicality and entanglement are discussed. All concepts are illustrated with experimental data.