Quantum Entanglement and Bell Nonlocality at Future Lepton Collider

Quantum entanglement and Bell nonlocality–cornerstones of quantum mechanics–have traditionally been investigated only in low-energy experimental settings. Only recently, these fundamental phenomena have come to be explored in the high-energy domain of particle physics, where collider experiments offer a powerful new platform for studying the phenomenology of quantum correlations. We present here recent results on the detection of entanglement and Bell nonlocality in processes such as tau-lepton, $WW$, and $ZZ$ pair production, illustrating the potential of Future Lepton Colliders to probe the quantum properties of fundamental interactions.