  The recent observation of entanglement between top and anti-top quarks at the
LHC opens the way to interpreting collider data with quantum information tools.
In this work we investigate the relevance of quantum observables in searches of
new physics. To this aim, we study spin correlations of top/anti-top pairs
originating from various intermediate resonances, and compare the discovery
reach of quantum observables compared to classical ones. We find that they
provide complementary information and, in several notable cases, also the
additional leverage necessary to detect new effects.
