Polarization and spin correlations play an important role in precision physics and searches for Beyond Standard Model (BSM) physics. Recently, there has been interest in using them to study quantum information phenomena, particularly quantum entanglement, at high energies. We present some of these ideas, focusing on top quarks and weak vector bosons. First, we demonstrate that entanglement can be studied in the semileptonic channel of top quark pair production. We then provide a phenomenological study of higher-order effects on angular coefficients and quantum observables in diboson production. We find that some of these effects can be large and, in some cases, disturb the properties of the density matrix. We then present possible ways to mitigate such effects.
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