Nord Quantique has published research demonstrating quantum error correction of a single-mode grid state qubit with state preparation and measurement (SPAM) errors below 0.1% — roughly a 100-fold improvement over prior GKP-based systems, now on par with leading superconducting transmon platforms. The achievement uses a repeat-until-success post-selected stabilization protocol that improves state preparation fidelity without requiring complex real-time classical control. The protocol also supports high-fidelity magic state preparation, a resource-intensive requirement for universal quantum computation. The company's CEO cited this as a step toward fault-tolerant quantum computing by 2030, leveraging a 1:1 physical-to-logical qubit approach.
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