Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 23: Quantum Control

QI 23.6: Talk

Thursday, March 21, 2024, 10:45–11:00, HFT-FT 131

Benchmarking a readout noise mitigation method on a superconducting qubit — •Andras Di Giovanni¹, Adrian S. Aasen^3,4, Hannes Rotzinger^1,2, Martin Gärttner^3,4, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut, — ²Institut für QuantenMaterialien und Technologien, Karlsruher Institut für Technologie, Karlsruhe, Germany — ³Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, German — ⁴Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität, Jena, Germany

Quantum technologies rely both on precise control and accurate readout of quantum systems. Current experiments are limited by numerous sources of noise that can only be partially captured by analytical models and therefore additional characterization of the noise sources is required. We benchmark a device tomography based method for readout error mitigation on a superconducting qubit. For this, we implement an experiment on a transmon with the goal of increasing its readout fidelity. In this talk, we present experimental results obtained by characterizing the performance of the method by carrying out a systematic sweep of noise sources on a superconducting qubit chip: suboptimal readout signal amplification and resonator photon population, off-resonant qubit drive, and effectively increased decoherence. Overall, a significant improvement of the infidelity up to a factor of 30 is observed, enabling the reliable readout of very noisy quantum systems.

Keywords: transmon; readout; noise; superconducting; qubit