Bonn 2025 – scientific programme
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QI: Fachverband Quanteninformation
QI 1: Certification and Benchmarking of Quantum Systems
QI 1.3: Talk
Monday, March 10, 2025, 11:45–12:00, HS IX
Scalable correlated readout error mitigation without randomized measurements — •Adrian Skasberg 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
Recently, quantum error mitigation techniques have increasingly focused on addressing readout errors. Key attributes sought in these protocols include scalability, practicality, and assumption-free noise models. Among the favored approaches are those utilizing randomized measurements. Despite their favorable scaling in sample complexity, randomized measruemnets are complex to implement. We present an alternative method which avoids randomized measurements, is scalable to large quantum systems, uses only single-qubit Pauli measurements, and captures a very broad class of correlated noise models. It builds on a robust readout error mitigated state tomograpy [1] and makes it scalable by using an efficient characterization of correlated POVMs. The method reconstructs overlapping readout error mitigated reduced density matrices, which gives access to arbitrary low- to medium-order correlators. We demonstrate that they are sample efficient with noisy POVMs extracted from superconducting qubit experiments.
[1] Aasen, A.S. et al. Readout error mitigated quantum state tomography tested on superconducting qubits. Commun Phys 7, 301.
Keywords: Readout error mitigation; Correlated noise; Detector tomography; Quantum state tomography