Applications are invited for a PhD position on quantum causality, focussing on the characterization of nonclassicality in the presence of (definite and) indefinite causal order. The position is funded by the QuanTEdu-France (France 2030) project at Aix-Marseille Université in the Calcul Naturel (CANA) team of the computer science lab, Laboratoire d’Informatique et des Systèmes (LIS).