Dresden 2026 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 42: Poster: Quantum Dynamics and Many-body Systems (joint session DY/TT)

DY 42.6: Poster

Wednesday, March 11, 2026, 15:00–18:00, P5

Absorbing-State Dynamics and Feedback Control in Quantum Many-Body Scar Systems — •Lara Schorr — University of Innsbruck

We look at quantum many-body scar states, which are special excited states in non-integrable systems that do not thermalize. To better understand their non-equilibrium dynamics, we translate the problem to a measurement-based quantum circuit equipped with feedback control. Focusing on a spin-1/2 chain with SU(2) symmetry, we show that local unitary feedback enables controlled manipulation of non-local charges, allowing the system to relax into highly entangled dark states. By analyzing the convergence towards the target state, we find that the dynamics resembles an emergent absorbing-state process, in which non-local charges diffuse and annihilate over time. Studying the scaling of convergence times allows us to identify conditions under which the dynamics may exhibit an absorbing-state phase transition.

Keywords: Many-Body Scar States; Absorbing-State Dynamics; Quantum Circuit; Feedback Control; State Preparation