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QI: Fachverband Quanteninformation

QI 23: Quantum Control

QI 23.2: Vortrag

Donnerstag, 21. März 2024, 09:45–10:00, HFT-FT 131

Modelling two-qubit gates of superconducting transmon processors — Michael Krebsbach, •Martin Koppenhöfer, and Thomas Wellens — Fraunhofer-Institut für Angewandte Festkörperphysik IAF, Tullastraße 72, 79108 Freiburg, Deutschland

Two-qubit gate errors remain one of the biggest obstacles on the road towards scalable quantum processors and circuits. In fixed-coupling superconducting transmon qubits, crosstalk effects can cause a significant degradation of two-qubit gate fidelities [1]. A precise understanding of these errors and their origin is an important step for error mitigation and thus crucial for the implementation of deeper circuits. We develop a noise model based on Hamiltonian simulation of coupled three-level systems, taking into account higher transmon levels and their anharmonicities. By comparing simulation results with experiments on IBM hardware, we identify important error mechanisms such as frequency collisions and investigate their impact on gate fidelities. [1] A. Ketterer and T. Wellens, Phys. Rev. Applied 20, 034065 (2023)

Keywords: Superconducting transmon qubits; Crosstalk; Improving noise models; Improving gate fidelities; Impact of higher transmon levels