Bonn 2025 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 28: Decoherence and Open Quantum Systems (joint session QI/Q)
QI 28.6: Vortrag
Donnerstag, 13. März 2025, 12:30–12:45, HS II
Entanglement phase transitions in boundary-driven open quantum systems — •Darvin Wanisch1,2, Nora Reinić1,2, Daniel Jaschke1,2,3, Pietro Silvi1,2, and Simone Montangero1,2,3 — 1Dipartimento di Fisica e Astronomia "G. Galilei'', Università di Padova, I-35131 Padova, Italy — 2Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Padova, I-35131 Padova, Italy — 3Institute for Complex Quantum Systems & Center for Integrated Quantum Science and Technology, Ulm University, 89069 Ulm, Germany
We present a numerical framework based on tree tensor networks that enables large-scale simulations of open quantum many-body systems and the efficient computation of entanglement monotones. We apply this framework to a paradigmatic open-system problem, the boundary-driven XXZ spin-chain. Our results demonstrate the framework's capability to probe entanglement in open systems and distinguish it from correlations with the environment. Furthermore, we find that the system undergoes entanglement phase transitions in both the coupling to the environment and the anisotropy parameter. Regarding the latter, our results connect the known transport regimes of the model to different entanglement phases, i.e., separable, area-law, and volume-law. Our work paves the way toward exploring entanglement in open systems, a necessary step for the development of scalable quantum technologies.
Keywords: Entanglement; Open quantum systems; Tensor networks