Syndrome-Resolved Decoding of Qubit Readout Errors
Abstract
Readout errors in superconducting qubits include incorrect state assignment, bit flips within the computational subspace, and leakage to non-computational states. These errors require different mitigation strategies, yet conventional measurement fidelity and repeatability metrics do not resolve their individual contributions. Previous repeated-readout studies have shown that temporal correlations reveal additional information about readout errors. Here we introduce the Readout Error Decoder (RED), which converts repeated thresholded binary records into a channel-resolved error budget. Controlled error injections validate the channel-specific response of the decoder. We demonstrate RED on both fluxonium and transmon qubits and across distinct leakage-lifetime regimes. RED identifies the error channels limiting readout performance without requiring dedicated discrimination of non-computational states, providing a basis for targeted readout optimization across different qubit modalities.
Related
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BibTeX
@misc{zheng2026syndromeresolved,
title = {{Syndrome-Resolved Decoding of Qubit Readout Errors}},
author = {Han Zheng and Vladimir Pešić and Nikolay Gusarov and Andrea Lizzit and Taketo Imaizumi and Chulwoo Ahn and Marco Nicolas Mueller and Raymond Mencia and Edoardo Charbon and Vladimir E. Manucharyan},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.20810},
eprint = {2610.20810},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.20810},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Syndrome-Resolved Decoding of Qubit Readout Errors
AU - Han Zheng
AU - Vladimir Pešić
AU - Nikolay Gusarov
AU - Andrea Lizzit
AU - Taketo Imaizumi
AU - Chulwoo Ahn
AU - Marco Nicolas Mueller
AU - Raymond Mencia
AU - Edoardo Charbon
AU - Vladimir E. Manucharyan
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.20810
UR - https://arxiv.org/abs/2610.20810
AB - Readout errors in superconducting qubits include incorrect state assignment, bit flips within the computational subspace, and leakage to non-computational states. These errors require different mitigation strategies, yet conventional measurement fidelity and repeatability metrics do not resolve their individual contributions. Previous repeated-readout studies have shown that temporal correlations reveal additional information about readout errors. Here we introduce the Readout Error Decoder (RED), which converts repeated thresholded binary records into a channel-resolved error budget. Controlled error injections validate the channel-specific response of the decoder. We demonstrate RED on both fluxonium and transmon qubits and across distinct leakage-lifetime regimes. RED identifies the error channels limiting readout performance without requiring dedicated discrimination of non-computational states, providing a basis for targeted readout optimization across different qubit modalities.
ER -