Quantum 2025 – scientific programme
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FRI: Friday Contributed Sessions
FRI 6: Quantum Error Mitigation
FRI 6.4: Talk
Friday, September 12, 2025, 11:30–11:45, ZHG007
Mitigation of correlated readout errors without randomized measurements — •Adrian Aasen1,2, Andras Di Giovanni3, Hannes Rotzinger3, Alexey Ustinov3, and Martin Gärttner2 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany — 2Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, Jena, Germany — 3Physikalisches Institut, Karlsruher Institut für Technologie, Karlsruhe, Germany
Quantum simulation, the study of strongly correlated quantum matter using synthetic quantum systems, has been the most successful application of quantum computers to date. It often requires determining observables with high precision, for example when studying critical phenomena near quantum phase transitions. Thus, readout errors must be carefully characterized and mitigated in data post-processing, using scalable and noise-model agnostic protocols. We present a readout error mitigation protocol that uses only single-qubit Pauli measurements and avoids experimentally challenging randomized measurements. The proposed approach captures a very broad class of correlated noise models and is scalable to large qubit systems. It is based on a complete and efficient characterization of few-qubit correlated positive operator-valued measures (POVMs), using overlapping detector tomography. To assess the effectiveness of the protocol, observables are extracted from simulations involving up to 100 qubits employing readout errors obtained from experiments with superconducting qubits.
Keywords: Readout error mitigation; Correlated noise; Quantum simulation; Quantum state tomography; Quantum detector tomography