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
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Quantum correlations are the strongest ones ever measuredSAKKMESTERKE/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.
Read moreQuantum weirdness isn’t weird – if we accept objects don’t exist
“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, also at the State University of Campinas, he has now offered one mathematically compelling answer…
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