Quantum

Syndrome-Resolved Decoding of Qubit Readout Errors

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 16/10/2026, 04:13:25 UTC.

Briefings

A new decoder named Readout Error Decoder (RED) converts repeated thresholded binary records into a channel-resolved error budget for superconducting qubits. The study validates RED using controlled error injections on fluxonium and transmon qubits across distinct leakage-lifetime regimes, identifying specific error channels that limit performance without needing dedicated state discrimination.

Key points

• The Readout Error Decoder (RED) converts repeated thresholded binary records into a channel-resolved error budget.
• RED identifies specific error channels limiting readout performance on fluxonium and transmon qubits without requiring dedicated discrimination of non-computational states.

Context

Previous repeated-readout studies showed temporal correlations reveal additional information about readout errors, but conventional metrics do not resolve individual contributions. This work introduces RED to address this gap.

Limitations

The study uses controlled error injections to validate the decoder's channel-specific response. Results are limited to fluxonium and transmon qubits across distinct leakage-lifetime regimes, and the decoder's performance in other modalities remains untested.

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