Characterizing quantum correlations and quantum teleportation in gg → tbar{t} and qbar{q} → tbar{t} processes under noisy channels

The measurement of top-quark spin correlations provides a key tool for probing its interactions with high precision. Owing to its extremely short lifetime $τsim 10^-25$ s, the top quark preserves its spin polarization information, making the tbar{t} system an ideal framework for investigating quantum correlations in high-energy physics. In this work, we analyze quantum correlations in tbar{t} pairs produced in QCD using several quantum information-theoretic measures, including Bell nonlocality, quantum steering, concurrence, and geometric quantum discord. Their dependence on kinematic variables is examined in both the gg → tbar{t} and qbar{q} → tbar{t} channels, with convergence toward the gg → tbar{t} dominated regime in the ultra-relativistic limit $β= 1$. We also investigate the effect of three effective decoherence channels (AD, PD, and PF). The AD and PD channels lead to a monotonic degradation of correlations as the decoherence parameter p increases, while the PF channel exhibits a symmetric behavior around p=1/2. The impact of these channels on quantum teleportation is analyzed, showing that it remains above the classical threshold of 2/3 even in the presence of noise. These results indicate that certain quantum resources can persist despite decoherence, opening new perspectives at the interface of quantum information and particle physics.