Professor Shenglong Xu
Texas A&M
Volume-Law Entangled Quantum Many-Body Scars and Their Applications
Location: 1080 Physics Research Building
Faculty Host: Nandini Trivedi
Abstract: Quantum many-body scars are rare, nonthermal eigenstates of interacting quantum systems that give rise to anomalously slow thermalization and long-lived coherent dynamics, as observed in recent experiments on Rydberg atom arrays. A key diagnostic of conventional scars is their low bipartite entanglement entropy, often obeying area-law scaling, in sharp contrast to the volume-law scaling typical of thermal eigenstates. In this talk, I will introduce a new class of quantum many-body scars that, despite exhibiting extensive bipartite entanglement entropy, retain a highly structured entanglement pattern—distinct from that of generic thermal states. I will show that such scar states arise in a variety of quantum many-body models, including the XY model, where they coexist with otherwise thermalizing dynamics. Finally, I will present a protocol that leverages the entanglement structure of these states to enable quantum many-body teleportation, highlighting their potential application in quantum information processing.
Bio: Shenglong Xu is an Assistant Professor in the Department of Physics & Astronomy at Texas A&M University. He received his Ph.D. in Physics from the University of California, San Diego in 2017, and then became a postdoctoral researcher at the Condensed Matter Theory Center at the University of Maryland. He joined the faculty at Texas A&M in 2020. His research focuses on condensed matter theory and quantum physics, with a current emphasis on non-equilibrium quantum many-body dynamics.
