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Developer Finds Six Real Bugs in Quantinuum's Quantum Computing Stack While Building Tools

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A developer building three open-source tools for Quantinuum's guppy and HUGR quantum computing stack uncovered six genuine bugs in the process. The tools include qshelf, a package registry for quantum algorithms; Estimand, a fault-tolerant resource estimator; and qmatchpoint, a decoder integration layer. Four bugs were found in the guppylang library itself, including incorrect unitaries produced by quantum Fourier transform circuits. Two more significant bugs emerged in Estimand, one involving a missing additive constant in a tile-count formula traced to a cited research paper, and another where an incorrect threshold constant was silently used in a magic-state factory error model. The findings were reported to maintainers, with at least one fix already submitted as a pull request and others prompting ongoing technical discussion.

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