Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 26: Correlated Magnetism – Frustrated Systems

TT 26.2: Talk

Tuesday, March 10, 2026, 09:45–10:00, HSZ/0103

Quantum annealing for lattice models with long-range interactions — •Jan Alexander Koziol and Kai Phillip Schmidt — Department of Physics, Staudtstraße 7, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), D-91058 Erlangen, Germany

We use superconducting qubit quantum annealing devices to determine the ground state in the thermodynamic limit of Ising models with algebraically decaying long-range interactions. This is enabled by a unit-cell-based optimization scheme, in which the finite optimizations on each unit cell are performed using commercial quantum annealing hardware. To demonstrate the capabilities of the approach, we choose three exemplary problems relevant for other quantum simulation platforms and material science: (i) the calculation of devil’s staircases of magnetization plateaux of the long-range Ising model in a longitudinal field on the triangular lattice, motivated by atomic and molecular quantum simulators; (ii) the evaluation of the ground state of the same model on the Kagomé lattice in the absence of a field, motivated by artificial spin ice; (iii) the study of models with modified few-nearest-neighbor interactions relevant for Ising compounds with potential long-range interactions. The approach discussed in this work provides a useful and realistic application of existing quantum annealing technology, applicable across many research areas in which lattice problems with resummable long-range interactions are relevant.

Keywords: quantum annealing; long-range Ising model; dipolar interactions; competing interactions; ground-state optimization