Dresden 2020 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 19: Nonequilibrium Quantum Many-Body Systems 1 (joint session TT/DY)
DY 19.11: Talk
Tuesday, March 17, 2020, 12:15–12:30, HSZ 204
Disentangling sources of quantum entanglement in quench dynamics — •Lorenzo Pastori1, Markus Heyl2, and Jan Carl Budich1 — 1Institute of Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany — 2Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany
Quantum entanglement may have various origins ranging from solely interaction-driven quantum correlations to single-particle effects. Here, we explore the dependence of entanglement on time-dependent single-particle basis transformations in fermionic quantum many-body systems, thus aiming at isolating single-particle sources of entanglement growth in quench dynamics. Using exact diagonalization methods, for paradigmatic nonintegrable models we compare to the standard real-space cut various physically motivated bipartitions. Moreover, we search for a minimal entanglement basis using local optimization algorithms, which at short to intermediate postquench times yields a significant reduction of entanglement beyond a dynamical Hartree-Fock solution. In the long-time limit, we identify an asymptotic universality of entanglement for weakly interacting systems, as well as a crossover from dominant real-space to momentum-space entanglement in Hubbard models undergoing an interaction quench. Finally, we discuss the relevance of our findings for the development of tensor-network based algorithms for quantum dynamics.