ATLAS observes first entangled qutrits from Higgs decay

Scientists from the ATLAS collaboration at CERN have for the first time recorded quantum entanglement between Z bosons produced in Higgs boson decay. This is the first observation of entanglement in elementary qutrits—three-state quantum systems; significance is 4.7 sigma based on 400 collision events.

• Entanglement of Z bosons in Higgs decay measured for the first time
• Significance is 4.7 sigma, 400 collision events analyzed
• First observation of entanglement in qutrits, not qubits