Testing Quantum Entanglement at Extreme Energies What remained less clear was whether entanglement could survive under far more extreme conditions, including the violent, high-energy particle collisions produced at CERN.
The Z bosons examined in the experiment came from the decay of a Higgs boson, the particle discovered at the LHC in 2012.
A Higgs boson can briefly decay into two Z bosons, which then decay into pairs of electrons or muons.
That allowed the team to determine whether the two Z bosons displayed the correlations expected from quantum entanglement.
The result represents one of the highest energy confirmations of quantum entanglement ever achieved.