SAMOP 2021 – scientific programme

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QI: Fachverband Quanteninformation

QI 12: Quantum Simulation and Many-Body Systems

QI 12.2: Invited Talk

Friday, September 24, 2021, 11:15–11:45, H3

An entanglement-based perspective on quantum many-body systems — •Norbert Schuch — University of Vienna, Austria

Quantum many-body systems exhibit a wide range of exciting and unconventional phenomena, such as order outside the conventional framework of symmetry breaking (``topological order'') which is accompanied by excitations with exotic properties (``anyons''), and the ability to store and process quantum information. All these phenomena are deeply rooted in the complex global quantum entanglement present in these systems. In my talk, I will explain how Quantum Information Theory, and in particular the theory of entanglement, provides us with a comprehensive perspective on these systems, which reconciles their global entanglement with the locality inherent to the physical laws, using the language of tensor networks. I will discuss how this allows us to obtain a full picture of how symmetries and entanglement interplay, and how it provides us both with a mathematical framework to analytically study exotic topologically ordered quantum systems, and with a wide range of numerical tools which allow to probe their unconventional physics at a microscopic level.