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  "construction": "Triangular 4.8.8 (square-octagon) color code at distance 15, reproduced from arXiv:2609.21376 Appendix D: data qubits on a triangular region of the square lattice (row widths 3,5,7,9,11,13,15,15,13,11,9,7,5,3,1), square weight-4 and octagon weight-8 faces, each face carrying both an XX and a ZZ check; H_X = H_Z = face-incidence matrix.",
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  "date": "2026-09-21",
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  "notes": "Reproduction of the published triangular 4.8.8 color code family (arXiv:2609.21376v1, Appendix D); parameters known in the literature. Checked against the board: no exact or WL-equivalent match to an existing entry. The paper proves circuit distance d_circ = d at d = 15 under superdense extraction; the code distance here is a witness-backed upper bound."
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