Figure 3.

a) Molecular orbital diagram of the oxygen molecule in the ¹Δ_g excited state,64 which consists of eight electrons in six orbitals and with the entanglement diagram in the center. Dashed arrows symbolize an electron pair that is equally likely to be in either of the two π* orbitals. The area of the red dot of each orbital is proportional to its single‐orbital entropy, whereas the thickness of the connecting lines is proportional to the value of the mutual information (see text for brief explanations). Reprinted from Ref. 64 with permission, Copyright (2017) Swiss Chemical Society. b) Entanglement diagram for trans‐[RuCl₄(NO)(1H‐indazole)] with 18 orbitals.68 Reprinted from Ref. 68 with permission.