Herbi Dreiner (U. Bonn) ,Testing for Locality via Bell’s Inequality or for Entanglement versus Non-Entanglement at High-Energy Colliders, [HET seminar]

Thursday 20 Nov 2025, 11:00 → 13:00 US/Eastern

Small Seminar Room

Abstract: The question of non-locality and entanglement of QM has been a long-running and intriguing mystery. There have been successful experimental tests with pairs of photons in the eV energy range, for which the Nobel prize was awarded a few years ago. More recently there has been an increased interest in possible tests 

at colliders, ie at high energies and involving fermions. We argue that it is not possible to test for locality via Bell’s inequality at colliders, as one only measures commuting observables. We similarly argue that it is not possible to test for spin entanglement versus non-entanglement, as one always must invoke QM when translating the

observed angular correlation of momenta to the underlying desired spin correlation. In each case we give several explicit examples.

https://bnl.zoomgov.com/j/16010362754?pwd=Z1l1SS9JUDlyR1hSUHNyaDV1dTZHUT09