ABSTRACT
Probing quantum entanglement in high-energy collisions has recently become a rapidly growing direction in particle physics, aiming to measure quantum correlations at the highest energy scales accessible to humans. A key question is how such entanglement relies on the analytic structure of scattering amplitudes. In this talk, I will show that the pole structure, associated with intermediate heavy particles, leads to distinctive entanglement features. When a heavy particle mediates inelastic scatterings with three or more final particles, the entanglement entropy between its decay products and the rest exhibits a universal dip as the energy increases, reflecting the limited information flow through on-shell heavy particles and signaling entanglement suppression in the heavy-particle-dominated regime. This reveals entanglement structures beyond the usual “area-law” behavior of 2-to-2 processes, where the entropy typically scales with the scattering cross section. Finally, I will comment on possible ways to probe these features experimentally through analyses of final-state phase-space distributions. This talk is based on JHEP 10 (2025) 003 [arXiv: 2507.03555].
BIOGRAPHY
Chon Man SOU is a postdoctoral Shuimu Scholar at Tsinghua University. He received his PhD from the Hong Kong University of Science and Technology in 2023. His research lies at the intersection of quantum information and high-energy physics, with current interests including quantum entanglement in scattering, quantum nature of cosmological perturbations, and cosmological open systems during inflation.
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