Nothing is stronger than quantum connections – and now we know why

The unusual connections between quantum objects are the strongest relationships physicists can detect – and the arithmetic of graphs might assist clarify why that is.

“We are touching the question of, in some way, why quantum theory is as it is,” says Carlos Vieira at the State University of Campinas in Brazil. Together with José Nogueira and Marcelo Terra Cunha, additionally on the State University of Campinas, he has now supplied one mathematically compelling reply…