Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 3: Quantum Simulation
QI 3.1: Talk
Monday, March 9, 2026, 15:00–15:15, BEY/0137
Real-Time Dynamics in a (2+1)-D Gauge Theory: The Stringy Nature on a Superconducting Quantum Simulator — Jesús Cobos1, Joana Fraxanet2, César Benito3, Francesco di Marcantonio1, Pedro Rivero2, Kornél Kapás4, •Miklós Antal Werner4, Örs Legeza4,5,6,7, Alejandro Bermudez3, and Enrique Rico1,8,9,10 — 1EHU QC, Bilbao, Spain — 2IBM Quantum, New York, USA — 3UAM-CSIC, Madrid, Spain — 4Wigner RCP, Budapest, Hungary — 5Dynaflex LTD, Budapest, Hungary — 6TUM IAS, Garching, Germany — 7Parmenides St., Pöcking, Germany — 8DIPC, San Sebastián, Spain — 9IKERBASQUE, Bilbao, Spain — 10CERN, Geneva, Switzerland
We probe string modes of motion with dynamical matter in a digital quantum simulation of the Z2-Higgs model with an optimized embedding into a heavy-hex organized superconducting quantum processor with up to 144 qubits. Using local gauge symmetries, we implement various error suppression, mitigation, and correction strategies to enable high control of electric strings connecting dynamical charges and to observe longitudinal oscillations and transverse bending at the endpoints of the string, which are precursors to hadronization and rotational spectra of mesons. To validate our error-aware protocols, we employ extensive tensor network simulations: the relevant parameter regimes of the model are determined by large-scale DMRG simulations. The dynamics are classically simulated by the basis update and Galerkin (BUG) method, and the agreement with hardware results is remarkable.
Keywords: Real-Time Simulation; Quantum Error Mitigation; Lattice Gauge Theory; Density Matrix Renormalization Group; Tensor Network States