Entanglement entropy is elastic cross section

Tuesday 3 Dec 2024, 10:00 → 12:00 Asia/Shanghai

online

Abstract:

I will present universal relations between the cross section, which is the primary observable for high energy particle scattering, and entanglement entropy, which quantifies the quantumness of the process. A careful formulation of incoming wave packets is essential to uncover these relations. We show that for 2-particle scattering with no initial entanglement, the entanglement entropy for elastic final states is the elastic cross section in the unit of the transverse size for the initial wave packets, which can be alternatively interpreted as the elastic scattering probability. This statement does not depend on details of the local dynamics, and is valid to all orders in coupling strength. Furthermore, different ways to partition the system of the two particles lead to final state entanglement entropy expressed as different kinds of semi-inclusive elastic cross sections. Our results imply a version of an area law for entanglement entropy of a two-body system.

Bio:

Dr Zhewei Yin obtained his BSc degree in 2015 at Peking University, China, and his PhD degree in 2020 at Northwestern University, USA. He then became a postdoctoral researcher at Uppsala University, Sweden, after which he has been holding a joint appointment as a postdoctoral fellow at Northwestern University and Argonne National Laboratory, USA. He works in the field of theoretical high energy physics, with a focus on discovering new properties and developing modern methods in scattering amplitudes and effective field theories, as well as connecting these formal development to particle phenomenology, gravitational wave physics and quantum information science.