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QI: Fachverband Quanteninformation

QI 8: Implementations III

QI 8.4: Vortrag

Dienstag, 10. März 2026, 14:45–15:00, BEY/0137

Inherent crosstalk in superconducting circuits — •Balázs Gulácsi and Guido Burkard — University of Konstanz, Konstanz, Germany

Crosstalk refers to unwanted qubit addressing. This is particularly detrimental for scaling quantum information systems because unintended interactions limit overall performance. For superconducting qubits, tunable couplings and frequency tunability achieved through externally applied magnetic fluxes enable high-fidelity entangling gates; however, they also introduce crosstalk through flux linkage. In this work, we are investigating the impact of time-dependent external-flux-aware circuit quantization on superconducting qubit couplings. We find that non-trivial couplings emerge between capacitively linked qubits when the magnetic flux threading one qubit's loop varies in time, in a manner analogous to Faraday's law of induction. These effects influence the performance of parametrically activated two-qubit gates and enable flux noise to propagate even to fixed-frequency transmons.

Keywords: flux crosstalk; quantum circuit theory; two-qubit gates; flux noise