A system’s state is characterised as entangled or quantum correlated if two or more particles cannot be described as a combination of separate, independent states but only as a whole. Researchers at the Kirchhoff Institute for Physics of Heidelberg University recently succeeded in verifying so-called non-local quantum correlations between ultracold clouds of rubidium atoms. Under the direction of Prof. Dr. Markus Oberthaler und Prof. Dr. Thomas Gasenzer, the researchers were able to gain important new insights into the character of quantum mechanical many-body systems.