Dynamical redistribution of quantum resources in tree-level Bhabha scattering

Research Approach

This study investigates the dynamical redistribution of quantum resources—specifically entanglement, coherence, and entropic uncertainty—during electron-positron (Bhabha) scattering. Using the framework of Quantum Resource Theory (QRT), the authors model the scattering process in the center-of-mass frame to evaluate how fermion mass and QED kinematics dictate the evolution of quantum states. By comparing non-relativistic (low momentum) and ultra-relativistic (high momentum) regimes, the researchers map the transition from mass-dominated helicity-flip dynamics to chiral-symmetric scattering.

Key Findings

The researchers identify a strict anti-correlation between entropic uncertainty and dynamically generated entanglement. In the ultra-relativistic limit, chiral symmetry restoration suppresses helicity-flip transitions, causing entanglement to peak sharply at specific scattering angles where s- and t-channel amplitudes equalize. The study also proves a rigorous mathematical equivalence between local wave-particle duality and global bipartite quantum coherence. Crucially, the authors demonstrate that while transverse scattering of factorized states can optimize non-local correlations, the presence of pre-existing local coherence disrupts this delicate kinematic balance, thereby suppressing the Bell parameter and preventing maximal violation of local realism.

By applying information-theoretic tools to high-energy physics, this work bridges the gap between fundamental QED processes and quantum information science. It provides a quantitative basis for understanding how relativistic scattering acts as a resource-processing mechanism. These insights are essential for researchers attempting to certify quantum signatures in high-energy environments, such as particle colliders, where the interplay between kinematics and quantum correlations is often obscured by complex scattering dynamics.