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QI: Fachverband Quanteninformation

QI 17: Quantum Information: Concept and Methods I

QI 17.4: Vortrag

Mittwoch, 20. März 2024, 10:15–10:30, HFT-TA 441

Cost-efficient readout error mitigation — •Ákos Budai^{1, 2}, Zoltán Zimborás², and András Pályi¹ — ¹Budapest University of Technology and Economics — ²Wigner RCP, Hungarian Academy of Sciences

Readout error mitigation (REM) is an efficient tool to improve the functionality of Noisy Intermediate-Scale Quantum (NISQ) devices. In most superconducting prototype quantum computers, the readout error dominates the errors of individual gates. The level of improvement gained by REM depends on the error probabilities and number of shots available. In this work, we quantify the efficiency of REM in quantum state tomography. We derive approximate analytical results for the mean squared error of the estimation. We start by introducing the measurement protocol for the case of single-qubit tomography, then we generalize to the N-qubit case and derive the scaling properties of the calculation with the number of qubits and the order of the Taylor expansion.

Keywords: readout error mitigation; NISQ devices; state tomography