Yes — with strong but not yet discovery-level evidence. ATLAS physicists at CERN reported that pairs of Z bosons produced in Higgs boson decays (H → ZZ* → 4 leptons) show spin correlations consistent with quantum entanglement, rejecting a non-entangled hypothesis at about 4.7 sigma in their most sensitive test.
That result is just shy of the traditional 5-sigma discovery threshold in particle physics. The finding was covered in mid-September 2026 science reporting and published in Physical Review Letters; researchers note it is the first strong evidence of entanglement between two massive vector bosons from Higgs decays.