Abstract: The Large Hadron Collider is opening a new avenue for studying fundamental aspects of quantum mechanics at the highest energies. In this seminar, I will review recent measurements of quantum correlations at the LHC and discuss why collider processes provide a unique laboratory for testing quantum phenomena. After introducing the key observables used to characterize these correlations, I will focus on top-quark pair production, highlighting the impact of near-threshold toponium effects. Finally, I will discuss the hierarchy of quantum correlations, from entanglement to quantum steering, and the prospects for probing them in current and future collider experiments