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THU: Thursday Contributed Sessions

THU 7: Entanglement and Complexity: Contributed Session to Symposium II

THU 7.1: Talk

Thursday, September 11, 2025, 14:15–14:30, ZHG008

Complexity-driven ground state estimation in the Agassi model — •Sönke Momme Hengstenberg¹ and Caroline Robin^1,2 — ¹Fakultät für Physik, Universität Bielefeld, D-33615, Bielefeld, Germany — ²GSI Helmholtzzenturm für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany

I will discuss entanglement and non-stabilizerness (also referred to as magic) in ground states of the Agassi model. This model describes a non-trivial quantum many-body system exhibiting both superfluid pairing and collective deformation phases. We present multi-partite entanglement measures and stabilizer Rényi entropies to characterize the quantum complexity of the system. Based on this knowledge, we provide techniques to accelerate the estimation of ground states of this model in different regimes. I conclude with a short outlook on how to generalize this method to more complex quantum many-body systems.

Keywords: entanglement; non-stabilizerness; magic; Agassi model; complexity