Tag: Logical Qubit

Quantinuum QC

Quantinuum Breaks Error Correction World Record Is This Just Chest-Puffing or a Substantive Milestone?

Quantinuum’s Helios system has set a new logical fidelity record of 99.9995%, equal to five errors per million operations. The result is 10 times better than the company’s September demonstration and shows a factor-of-12 reduction in logical errors with each increase in code distance. Independent assessment from Sandia and comparisons to prior published work indicate the milestone goes beyond a single fidelity record.

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Alice & Bob Logo

Alice & Bob Proposes Five-Criteria Framework to Benchmark Logical Qubit Claims

Alice & Bob has published a whitepaper defining five criteria to benchmark logical qubit claims. The framework provides a modality-agnostic way to evaluate demonstrations of quantum error correction for fault-tolerant quantum computing. Key requirements include achieving breakeven with physical qubits, using scalable code parameters, running sufficient QEC cycles, measuring performance across all runs without post-selection, and operating on utility-relevant timescales. This structured approach enables consistent comparisons across hardware modalities and aligns claims with practical FTQC needs.

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