Regensburg 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

QI: Fachverband Quanteninformation

QI 10: Quantum Simulation and Many-Body Systems

QI 10.6: Vortrag

Donnerstag, 8. September 2022, 11:15–11:30, H9

Quantum Information Scrambling in Thermalizing Spin Chains with Nonlocal Interactions — •Darvin Wanisch^1,2,3 and Stephan Fritzsche^1,2,3 — ¹Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany — ²Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany — ³GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany

Motivated by recent works on information scrambling in spin systems with nonlocal interactions, and their potential of sharing features of quantum gravity, we study scrambling in different variants of the Ising model. Our results demonstrate that out-of-time-order correlators (OTOCs) might not be sufficient to properly characterize information scrambling in the presence of nonlocal interactions. In particular, two models that exhibit a highly nonlinear lightcone can vary widely in their thermalization timescale. More elaborate measures of operator growth can distinguish these two scenarios and reveal very different operator dynamics. Moreover, we find a distinct analogy between the growth of a local operator under time-evolution and the entanglement entropy following a quantum quench. Our work gives new insights into scrambling properties of systems that are within reach of state-of-the-art experimental platforms and complements results on the possibility of observing features of quantum gravity in the laboratory.