Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 1: Quantum Computing and Algorithms I
QI 1.8: Talk
Monday, March 9, 2026, 11:45–12:00, BEY/0137
Greens Function on Quantum Computers: Error Mitigation and application in Dynamical Mean Field Theory — •Jannis Ehrlich1, Aljoscha F. Baumann1, Daniel F. Urban1,2, and Christian Elsässer1,2 — 1Fraunhofer-Institut für Werkstoffmechanik IWM, Freiburg, Germany — 2Freiburger Materialforschungszentrum, Universität Freiburg, Germany
Dynamical Mean Field Theory (DMFT) has become a powerful tool for investigating the physics of materials that exhibit strong electronic correlations, like high-temperature superconductivity or metal-insulator transitions. The numerically challenging part is the calculation of the Greens function (GF) of the underlying Anderson impurity auxiliary model due to the explicit
treatment of electron interactions, which is also directly connected to the energy of the system and the spectral function.
We present a time-evolution approach for extracting the GF by simulating the quantum system on a quantum computer and show its performance for the auxiliary Anderson impurity model of DMFT on real quantum processors with systems of increasing sizes. We further investigate the relevance of accuracy in the ground-state preparation and demonstrate possibilities to reduce and mitigate errors of current quantum devices.
Keywords: Quantum Computing; Time-Evolution; Correlated Electrons