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"witness": [ 9, 13, 26, 30, 35, 39, 57, 59, 61, 63, 81, 85, 128, 132, 152, 154, 156, 158, 187, 191, 211, 215, 235, 239 ], "witness_provenance": { "found_by": [ "@vprusso" ], "date": "2026-10-30", "found_at_samples": 300000000, "survived_samples": 300000000, "tool": "verify/ris_gpu.py (Perlmutter A100)", "seeds": [ 1 ] } } }, "provenance": { "authors": [ "@vprusso" ], "construction": "Bivariate bicycle on Z_16 x Z_8 (n = 2lm = 256) with A = x^7y^4 + x^5y^7 + y + x^2y^5 and B = x^5y^3 + x^6y^3 + x^12y^2 + x^3y^3, H_X = [A | B], H_Z = [B^T | A^T]; built by research/kit/bb.build_bb(l=16, m=8, A_terms=[[7, 4], [5, 7], [0, 1], [2, 5]], B_terms=[[5, 3], [6, 3], [12, 2], [3, 3]]).", "references": [ "S. Bravyi, A. W. Cross, J. M. Gambetta, D. Maslov, P. Rall, and T. J. Yoder, High-threshold and low-overhead fault-tolerant quantum memory, Nature 627, 778 (2024), arXiv:2308.07915" ], "date": "2026-10-23", "notes": "Unattended loop run on Perlmutter, iteration 397, direction bb-w4-mid, seed 20261414. The deeper rungs recorded in notes/ agree with the gate's reading of d = 24.", "model": "Claude Fable 5.1 (Claude Code) working for @vprusso", "origin": "submission", "search_budget": { "candidates_screened": 106817, "tool": "research/kit/search.screen_adaptive; verify/heuristic_distance.estimate; verify/ris_gpu.py", "notes": "candidates_screened counts direction bb-w4-mid of the loop through 29 October; the loop's 390.6 CPU hours cover all five directions", "gpu_hours": 0.34, "ris_trials_per_side": 300000000 } }, "family": "bivariate-bicycle" }