Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 3: Quantum Simulation
QI 3.9: Talk
Monday, March 9, 2026, 17:30–17:45, BEY/0137
Quantum Simulation of Electron-Phonon Interactions in Circuit QED — •Riccardo Roma1,2, Tim Bode1, Dmitriy S. Shapiro1, Alessandro Ciani1, Dmitry Bagrets1,3, and Frank Wilhelm-Mauch1,2 — 1Institute for Quantum Computing Analytics (PGI-12), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany — 3Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany
Electron-phonon interaction is a fundamental process in condensed-matter physics, responsible for a variety of phenomena ranging from polaron formation in semiconductors and molecules to charge-density waves, (high-temperature) superconductivity or the Hubbard-Holstein (HH) and the Yukawa-Sachdev-Ye-Kitaev (YSYK) models.
Leveraging physical resonators for emulating bosonic degrees of freedom allows to circumvent the considerable overhead associated with their encoding in qubits. It also avoids the necessity of truncating the bosonic Fock space, which is an inherent limitation of current qubit encodings.
We extend the standard gate set available for superconducting qubits by entangling gates between a transmon and a microwave resonator, showing how this can be achieved experimentally via flux tuning or microwave driving. We then derive the digital simulation circuits for the HH and YSYK models. Our work concludes with a minimal electron-phonon model for which we demonstrate a Dicke-type superradiant transition that is robust to noise and thus experimentally feasible.
Keywords: Simulation; YSYK; Hubbard-Holstein; Resonators; Electron-phonon