Hi everyone,

Last month we were absolutely thrilled to share our new results from Meridian, our purpose-built AI system for fault-tolerant quantum computing design!

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We wanted to test Meridian to see how it stacks up against existing methods and general-purpose AI.
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Across more than 100 fault-tolerance design tasks, Meridian achieved a median reduction of over 10× in logical error rates compared with the best-performing circuits from five leading published algorithms. It also outperformed a general-purpose AI agent, with a median reduction of over 40%.

These results focus on a critical part of quantum computer architecture: the circuits that detect errors in protected quantum information. Our evaluation spans 10 quantum error correction (QEC) code families, varied hardware layouts and error models representing the major quantum computing platforms.
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Meridian’s specialized AI scientists combine frontier models, human-curated knowledge and validation tools from Plaquette, QC Design’s quantum design-automation platform. Plaquette tests candidate designs under realistic hardware imperfections, helping Meridian distinguish genuine improvements from designs that score well for the wrong reasons.
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For quantum hardware teams, this means being able to explore more design possibilities and evaluate which ones work best for their hardware, which is very exciting for us! You can read more about it here.

Until next month,

The QC Design team