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Physics

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

The mathematics of graphs has helped reveal a principle that limits the strength of quantum correlations – and explains why physicists have never measured any stronger connections in some post-quantum realm

By Karmela Padavic-Callaghan

6 May 2025

Quantum correlations are the strongest ones ever measured

SAKKMESTERKE/SCIENCE PHOTO LIBRARY

The strange connections between quantum objects are the strongest relationships physicists can detect – and the mathematics of graphs may help explain why that is.

“We are touching the question of, in some way, why quantum theory is as it is,” says at the State University of Campinas in Brazil. Together with and , also at the State University of Campinas, he has now offered one mathematically compelling answer…

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