Nord Quantique Implements Post-Selected Stabilization to Suppress GKP Qubit SPAM Errors Below 0.1% - Quantum Computing Report

Quantum hardware developer Nord Quantique has detailed an error-mitigation methodology that curtails State Preparation and Measurement (SPAM) error rates within single-mode bosonic grid-state qubits. Published as a preprint on arXiv (“Quantum error correction of a grid-state qubit with state preparation and measurement errors below 10−3“), the research team leveraged high-performance autonomous quantum error correction (QEC) to implement a repeat-until-success initialization sequence alongside a multi-round repeated measurement framework. The combined optimization suppresses total SPAM errors to below 0.1% (7(7)×10−4 average across all cardinal states), delivering a 100-fold reduction in operational noise compared to traditional Gottesman-Kitaev-Preskill (GKP) architectures. This optimization brings bosonic initialization [...]

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