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QI: Fachverband Quanteninformation

QI 16: Quantum Computing Theory III

QI 16.1: Vortrag

Dienstag, 11. März 2025, 14:00–14:15, HS IV

Time-Evolution Approach for Dynamical Mean Field Theory Calculations on a Quantum Computer — •Jannis Ehrlich and Daniel F. Urban — Fraunhofer-Institut für Werkstoffmechanik IWM, 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 of the underlying auxiliary model due to the explicit treatment of electron interactions. We present a time-evolution approach for extracting the Greens function by simulating the quantum system on a quantum computer. We explicitly investigate the influence of errors on the results and show that an efficient treatment of the time-evolution operator along with proper error mitigation strategies allows for simulations even on current NISQ devices.

Keywords: Quantum Computing; Correlated Electrons