Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 1: Quantum Computing and Algorithms I
QI 1.6: Talk
Monday, March 9, 2026, 10:45–11:00, BEY/0137
Entanglement-informed construction of variational quantum circuits — Alina Joch1,2, Götz Uhrig1, and •Benedikt Fauseweh1,2 — 1Condensed Matter Theory, TU Dortmund University, Otto-Hahn-Straße 4, 44227 Dortmund, Germany — 2Institute of Software Technology, German Aerospace Center (DLR), 51147 Cologne, Germany
The variational quantum eigensolver is a promising tool for simulating ground states of quantum many-body systems on noisy quantum computers. Its effectiveness relies heavily on the ansatz, which must be both hardware-efficient for implementation on noisy hardware and problem-specific to avoid local minima and convergence problems. Here, we explore entanglement-informed ansatz schemes that naturally emerge from specific models, aiming to balance accuracy with minimal use of two-qubit entangling gates. We investigate quasi-1D Hamiltonians focusing on entanglement barriers and long-range interactions. We find that including the entanglement structure in the parameterized quantum circuit reduces the resources necessary to achieve a given accuracy. A better assessment is obtained by analyzing how the ansatz captures the entanglement spectrum. Our comprehensive analysis provides a new perspective on the design of ansätze based on the expected entanglement structure of the approximated state.
Quantum Sci. Technol. 10 035032 (2025)
Keywords: VQE; Entanglement Spectrum; Random Quantum Critical Point