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276, 277, 278, 279, 355, 358 ], [ 280, 281, 282, 283, 362, 367 ], [ 284, 285, 286, 287, 359, 366 ], [ 288, 289, 290, 291, 354, 356 ], [ 292, 293, 294, 295, 357, 361 ], [ 296, 297, 298, 299, 353 ], [ 300, 301, 302, 303, 358, 361 ], [ 304, 305, 306, 307, 354, 362 ], [ 308, 309, 310, 311, 381 ], [ 312, 313, 314, 315, 359 ], [ 316, 317, 318, 319, 354 ] ] }, "distance": { "d": 10, "X": { "value": 10, "confidence": "upper_bound", "witness": [ 20, 21, 56, 57, 116, 117, 128, 129, 236, 237 ] }, "Z": { "value": 10, "confidence": "upper_bound", "witness": [ 40, 41, 168, 169, 184, 185, 220, 221, 276, 277 ] } }, "provenance": { "authors": [ "@MathysRennela" ], "construction": "Distance-amplified code: one [[4,2,2]] tensor-product amplification step (central three-term truncation of the chain-complex tensor product, arXiv:2609.37231 Eq. 1/Eq. 12-15) applied to the board's [[80,18,5]] planar hyperbolic {5,5} code entry, using a sparse independent-row presentation of its checks: n' = 4n + m_X + m_Z = 382, k' = 2k = 36, check weight w' = w+1 = 6. X/Z witnesses are the base witnesses tensored with the weight-2 [[4,2,2]] logical on the central register (weights 10/10); a 100000-trial fast-backend search (seed 5000) found nothing lighter (min weight 10). Base provenance: Planar hyperbolic {5,5} code, literature reproduction from github.com/QEC-pages/Quantum_LDPC_Codes @ 1c95489383564e4dc2cce517de00d64d6f2c4f56, Hyperbolic_Codes_Planar.zip, parity-check matrices for N=80. Same source repository already used for codes/720-122-8.json, codes/864-146-8.json, codes/896-194-6.json, codes/900-182-8.json, codes/960-258-6.json (Seam D, fieldnotes/2026-09-18-hackathon-1155-frontier-map-and-playbook.md); this pulls a different (p,q,N) entry from the same pinned catalog (Hyperbolic_Codes.tsv) that those five did not use. CSS code, edge model.", "references": [ "arXiv:2609.37231", "github.com/QEC-pages/Quantum_LDPC_Codes" ], "date": "2026-09-30", "notes": "Constructed and packaged with the Space Bunny Alpha 1.0 model.", "model": "Space Bunny Alpha 1.0" }, "family": "distance-amplified" }