The shape of higher-dimensional state space: Bloch-ball analog for a qutrit

This work was funded by the German Research Foundation Project EL710/2-1 (C.E., J.S.), by grant PGC2018-101355-B-100 (MCIU/FEDER,UE) and Basque Government grant IT986-16 (J.S.). C.E. and J.S. acknowledge Klaus Richter's support for this project. M.H. and S.M. acknowledge funding from the Austrian Science Fund (FWF) through the START project Y879-N27 and the stand-alone project P 31339-N27.