Modelling two-qubit gates of superconducting transmon processors

ORAL

Abstract

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)

* The authors acknowledge funding from the Ministry of Economic Affairs, Labour and Tourism Baden-Württemberg, under the project QORA in the frame of the Competence Center Quantum Computing Baden-Württemberg.

–

Presenters

  • Michael Krebsbach

    Fraunhofer Institute for applied Solid State Physics IAF

Authors

  • Michael Krebsbach

    Fraunhofer Institute for applied Solid State Physics IAF