  Helicity selection rules can defy the expectation that the leading
contributions from Standard Model Effective Field Theory operators occur at
dimension 6, potentially reducing sensitivity to new physics scenarios. This
paper investigates how spin correlations can restore ("resurrect") the
interference contributions of the $\tau$ lepton's anomalous dipole moment. We
first illustrate the mechanism for this interference restoration using a simple
quantum mechanical example. We then calculate the sensitivity of these spin
correlations to new physics. Additionally, we compute quantum information
observables, namely measures of entanglement, Bell inequality violation, and
the irreducible quantum uncertainty of the $\tau\tau$ state. Our findings show
that spin correlation observables outperform both the cross-section and quantum
information observables, by providing greater sensitivity to new physics and
preserving information about $CP$ violation.
