Abstract
Quantum entanglement and Bell-inequality violation in τ⁺τ⁻ pairs provide a sensitive probe of quantum correlations in high-energy interactions. We present a feasibility study of e⁺e⁻ → τ⁺τ⁻ at the proposed Super Tau-Charm Facility based on full Monte Carlo simulation at √s = 7 GeV, focusing on the ππ channel (τ^± → π^±ν), which offers the maximal spin-analyzing power |κ| = 1 and the simplest final-state topology for validating the quantum-tomography framework. We establish a consistency chain from the tree-level QED prediction through truth-level and detector-level reconstruction, yielding a reconstructed concurrence of 0.279 ± 0.007 with the good-solution approach. A complementary full-simulation study of the ρρ channel is also briefly reported. These results demonstrate that the STCF can provide a competitive platform for precision studies of quantum correlations in τ-lepton pairs.