Digital Predistortion for Flux Control of Tunable Superconducting Qubits

• URL: http://arxiv.org/abs/2604.15895v1
• Date: Fri, 17 Apr 2026 09:47:17 GMT
• Title: Digital Predistortion for Flux Control of Tunable Superconducting Qubits
• Abstract summary: Digital predistortion (DPD) framework for characterizing and compensating for distortion.<n>Experiments on a flux-tunable quantum processing unit (QPU)<n>Method enables automated rapid calibration of flux control channels for superconducting QPUs.
• Score: 0.5339714295362322
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Flux-tunable superconducting qubits rely on fast flux control pulses to implement two-qubit entangling quantum gates, a key building block for quantum algorithms. However, distortion effects introduced by non-ideal control electronics, parasitic components, and the cryogenic quantum chip response can all degrade the gate fidelity. We present a digital predistortion (DPD) framework for characterizing and then compensating for these distortions using a combination of infinite impulse response (IIR) and finite impulse response (FIR) filters. Experiments on a flux-tunable quantum processing unit (QPU) demonstrate a successful correction of step-response distortions on the flux-control line, with a compensated control signal showing only sub-percent deviations from the ideal target linear behavior. The demonstrated method enables automated rapid calibration of flux control channels for superconducting QPUs.

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