[[147,21,6]] · QEC Challenge

[[147,21,6]] d ≤stabilizer

147

kd²/n

5.143

Share this result

Distance

a general stabilizer code has no X and Z sides: d is the minimum Pauli weight of a nontrivial logical operator (a Y factor counts one qubit), and the witness is one Pauli operator that commutes with every generator and is not a product of them

d 6 · witness Pauli weight 6 (claimed upper_bound)

witness operator (Pauli string, 6 qubits)

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certificate none yet · distance stands as a self-certified upper bound (d ≤); the Pauli-weight certifier is not built yet, so stabilizer entries cannot earn d= for now

Diagnostics

computed by the verifier from the parity checks, the layout, and the stored witnesses; shown as evidence, not used for ranking

girth S 4 (shortest cycle of the generator Tanner graph; longer is friendlier to belief propagation)

check weights S 6

qubit degrees S 6

trapping sets S (1,6)×147 (2,8)×882 (3,6)×441 (smallest syndrome weight at each size, connected sets of up to 3 qubits)

full (size, syndrome weight): count census for S

(1,6): 147 (2,8): 882 (2,10): 441 (3,6): 441 (3,8): 882 (3,10): 4263 (3,12): 5292 (3,14): 1323

Construction & provenance

authors @FarLab

provenance submitted through the challenge

novelty novelty not audited

construction One-block cyclic stabilizer code: generator X^a Z^b and its 147 cyclic shifts, a(x) = x⁶² + x⁶⁴ + x⁸³ + x⁸⁵, b(x) = x²² + x⁶⁴ + x⁸³ + x¹²⁵ in F_2[x]/(x¹⁴⁷ - 1); a = g p, b = g q with p, q palindromic so that a b* + b a* = 0; k = deg gcd(a, b, x¹⁴⁷ - 1)

model Claude Fable 5.1 (claimed, not verified)

builds on arXiv:quant-ph/0502086

date 2026-10-01

notes Found by a sweep of one-block palindromic cyclic codes (Camara-Ollivier-Tillich-type group-algebra code over Z_147, arXiv:quant-ph/0502086), n = 17..200, weight <= 8. Distance ladder: 300-trial Pauli-weight RIS screen, then 2 x 20,000 trials on fresh seeds (held). Novelty unknown: not checked against codetables.de; the dedup gate found no exact, WL-equivalent or Hadamard-image board entry. Genuinely non-CSS: a and b overlap, so every generator carries Y.

family other (a tag, not a ranking)

locality unrestricted (computed from the layout)

weight class weight ≤ 6 (computed)

How this code was found

the research note submitted with this code · raw markdown · all notes

[[147,21,6]] — one-block palindromic cyclic stabilizer code X^a Z^b, weight 6

Direction & hypothesis

The general-stabilizer board's low-weight cells (w <= 8) held only a handful of small codes and the two Chamon baselines (kd^2/n = 4), while the higher-k entries have weight 32. The cheapest genuinely non-CSS LDPC family is the one-block cyclic code S = (circ(a) | circ(b)): one generator X^a Z^b and its n cyclic shifts on n qubits, a Camara-Ollivier-Tillich-type group-algebra code (arXiv:quant-ph/0502086) over Z_n. The shifts commute iff a b* + b a* = 0 (b*(x) = b(1/x)); that holds whenever a = g p and b = g q with p, q palindromic (p = p*) and g arbitrary, and for even n also after b -> x^(n/2) b. Then k = deg gcd(a, b, x^n - 1) and the check weight is |supp a u supp b|. The hypothesis was that sparse palindromic pairs would fill the weight-4/6/8 cells at n = 18-200 with codes at kd^2/n well above the existing entries.

What was searched

All n from 17 to 200; p, q palindromic of weight <= 4 (p taken up to the multiplier

group Z_n^*), g in {1} u {1 + x^j}, both shift variants for even n, check weight <= 8. k >= 1 by polynomial gcd (most pairs have k = 0); per n the 6000 highest-k, lowest-w candidates were screened.

Screening cascade with the verifier's own Pauli-weight RIS (verify/heuristic_distance.py):

8 trials (drop d < 5, and kd^2/n < 3 for n > 40), then 300 trials; kept only if not dominated on (n, k, d, w) by any stabilizer board entry or earlier find.

Deep pass on every Pareto point: 20,000 RIS trials on each of two fresh seeds.

Evidence trail

Screen: d <= 6 at 300 trials. Deep: 2 x 20,000 trials found nothing lighter (held).

qldpc submit re-searched (20,000 trials) and the filed witness has Pauli weight 6.

Claim: d <= 6, witness-backed upper bound; the board's certifier does not minimise Pauli

weight, so no stabilizer entry is exact on the board.

Dead ends

Two-generator and non-palindromic pairs were not searched; the family is exactly the

one above.

Composite n (63, 68, ...) produce 50-80k k >= 1 candidates and dominate the run time; prime

n produce few and mostly k = 1 codes (the X_{i,i+1} Z_{i-j,i+j} weight-4 family, d up to 11 at n = 61).

Candidates that screened at 300 trials and dropped under the deep pass were discarded;

the deep pass changed the distance of a minority of finds by one or two.

Tools

Claude Fable 5.1 in Claude Code; numpy; verify/heuristic_distance.py (Pauli-weight RIS), cli/qldpc.py, verify/. Laptop CPU, a few hours for the whole sweep.

Reproduction

n = 147; a(x) = x^62 + x^64 + x^83 + x^85; b(x) = x^22 + x^64 + x^83 + x^125. Generator i (i = 0..n-1) is X on {i + e mod n : e in supp a} and Z on {i + e mod n : e in supp b} (both -> Y). S = (circ(a) | circ(b)); k = n - rank_2(S) = 21. Witness: X on [99, 101], Z on [59, 80, 120, 141].

Stabilizer generators

generators 147 (max weight 6; 147 mixed X/Z) (one binary symplectic matrix S = (A | B); generator i is X on A_i and Z on B_i, Y where both)

generators (147, Pauli strings on 147 qubits)

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IYIIIIIIIIIIIIIIIIIIYIXIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIX XIYIIIIIIIIIIIIIIIIIIYIXIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IXIYIIIIIIIIIIIIIIIIIIYIXIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIXIYIIIIIIIIIIIIIIIIIIYIXIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIXIYIIIIIIIIIIIIIIIIIIYIXIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIXIYIIIIIIIIIIIIIIIIIIYIXIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII 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symplectic rows (A | B) (147, sparse supports)

X: [62, 64, 83, 85] Z: [22, 64, 83, 125] X: [63, 65, 84, 86] Z: [23, 65, 84, 126] X: [64, 66, 85, 87] Z: [24, 66, 85, 127] X: [65, 67, 86, 88] Z: [25, 67, 86, 128] X: [66, 68, 87, 89] Z: [26, 68, 87, 129] X: [67, 69, 88, 90] Z: [27, 69, 88, 130] X: [68, 70, 89, 91] Z: [28, 70, 89, 131] X: [69, 71, 90, 92] Z: [29, 71, 90, 132] X: [70, 72, 91, 93] Z: [30, 72, 91, 133] X: [71, 73, 92, 94] Z: [31, 73, 92, 134] X: [72, 74, 93, 95] Z: [32, 74, 93, 135] X: [73, 75, 94, 96] Z: [33, 75, 94, 136] X: [74, 76, 95, 97] Z: [34, 76, 95, 137] X: [75, 77, 96, 98] Z: [35, 77, 96, 138] X: [76, 78, 97, 99] Z: [36, 78, 97, 139] X: [77, 79, 98, 100] Z: [37, 79, 98, 140] X: [78, 80, 99, 101] Z: [38, 80, 99, 141] X: [79, 81, 100, 102] Z: [39, 81, 100, 142] X: [80, 82, 101, 103] Z: [40, 82, 101, 143] X: [81, 83, 102, 104] Z: [41, 83, 102, 144] X: [82, 84, 103, 105] Z: [42, 84, 103, 145] X: [83, 85, 104, 106] Z: [43, 85, 104, 146] X: [84, 86, 105, 107] Z: [0, 44, 86, 105] X: [85, 87, 106, 108] Z: [1, 45, 87, 106] X: [86, 88, 107, 109] Z: [2, 46, 88, 107] X: [87, 89, 108, 110] Z: [3, 47, 89, 108] X: [88, 90, 109, 111] Z: [4, 48, 90, 109] X: [89, 91, 110, 112] Z: [5, 49, 91, 110] X: [90, 92, 111, 113] Z: [6, 50, 92, 111] X: [91, 93, 112, 114] Z: [7, 51, 93, 112] X: [92, 94, 113, 115] Z: [8, 52, 94, 113] X: [93, 95, 114, 116] Z: [9, 53, 95, 114] X: [94, 96, 115, 117] Z: [10, 54, 96, 115] X: [95, 97, 116, 118] Z: [11, 55, 97, 116] X: [96, 98, 117, 119] Z: [12, 56, 98, 117] X: [97, 99, 118, 120] Z: [13, 57, 99, 118] X: [98, 100, 119, 121] Z: [14, 58, 100, 119] X: [99, 101, 120, 122] Z: [15, 59, 101, 120] X: [100, 102, 121, 123] Z: [16, 60, 102, 121] X: [101, 103, 122, 124] Z: [17, 61, 103, 122] X: [102, 104, 123, 125] Z: [18, 62, 104, 123] X: [103, 105, 124, 126] Z: [19, 63, 105, 124] X: [104, 106, 125, 127] Z: [20, 64, 106, 125] X: [105, 107, 126, 128] Z: [21, 65, 107, 126] X: [106, 108, 127, 129] Z: [22, 66, 108, 127] X: [107, 109, 128, 130] Z: [23, 67, 109, 128] X: [108, 110, 129, 131] Z: [24, 68, 110, 129] X: [109, 111, 130, 132] Z: [25, 69, 111, 130] X: [110, 112, 131, 133] Z: [26, 70, 112, 131] X: [111, 113, 132, 134] Z: [27, 71, 113, 132] X: [112, 114, 133, 135] Z: [28, 72, 114, 133] X: [113, 115, 134, 136] Z: [29, 73, 115, 134] X: [114, 116, 135, 137] Z: [30, 74, 116, 135] X: [115, 117, 136, 138] Z: [31, 75, 117, 136] X: [116, 118, 137, 139] Z: [32, 76, 118, 137] X: [117, 119, 138, 140] Z: [33, 77, 119, 138] X: [118, 120, 139, 141] Z: [34, 78, 120, 139] X: [119, 121, 140, 142] Z: [35, 79, 121, 140] X: [120, 122, 141, 143] Z: [36, 80, 122, 141] X: [121, 123, 142, 144] Z: [37, 81, 123, 142] X: [122, 124, 143, 145] Z: [38, 82, 124, 143] X: [123, 125, 144, 146] Z: [39, 83, 125, 144] X: [0, 124, 126, 145] Z: [40, 84, 126, 145] X: [1, 125, 127, 146] Z: [41, 85, 127, 146] X: [0, 2, 126, 128] Z: [0, 42, 86, 128] X: [1, 3, 127, 129] Z: [1, 43, 87, 129] X: [2, 4, 128, 130] Z: [2, 44, 88, 130] X: [3, 5, 129, 131] Z: [3, 45, 89, 131] X: [4, 6, 130, 132] Z: [4, 46, 90, 132] X: [5, 7, 131, 133] Z: [5, 47, 91, 133] X: [6, 8, 132, 134] Z: [6, 48, 92, 134] X: [7, 9, 133, 135] Z: [7, 49, 93, 135] X: [8, 10, 134, 136] Z: [8, 50, 94, 136] X: [9, 11, 135, 137] Z: [9, 51, 95, 137] X: [10, 12, 136, 138] Z: [10, 52, 96, 138] X: [11, 13, 137, 139] Z: [11, 53, 97, 139] X: [12, 14, 138, 140] Z: [12, 54, 98, 140] X: [13, 15, 139, 141] Z: [13, 55, 99, 141] X: [14, 16, 140, 142] Z: [14, 56, 100, 142] X: [15, 17, 141, 143] Z: [15, 57, 101, 143] X: [16, 18, 142, 144] Z: [16, 58, 102, 144] X: [17, 19, 143, 145] Z: [17, 59, 103, 145] X: [18, 20, 144, 146] Z: [18, 60, 104, 146] X: [0, 19, 21, 145] Z: [0, 19, 61, 105] X: [1, 20, 22, 146] Z: [1, 20, 62, 106] X: [0, 2, 21, 23] Z: [2, 21, 63, 107] X: [1, 3, 22, 24] Z: [3, 22, 64, 108] X: [2, 4, 23, 25] Z: [4, 23, 65, 109] X: [3, 5, 24, 26] Z: [5, 24, 66, 110] X: [4, 6, 25, 27] Z: [6, 25, 67, 111] X: [5, 7, 26, 28] Z: [7, 26, 68, 112] X: [6, 8, 27, 29] Z: [8, 27, 69, 113] X: [7, 9, 28, 30] Z: [9, 28, 70, 114] X: [8, 10, 29, 31] Z: [10, 29, 71, 115] X: [9, 11, 30, 32] Z: [11, 30, 72, 116] X: [10, 12, 31, 33] Z: [12, 31, 73, 117] X: [11, 13, 32, 34] Z: [13, 32, 74, 118] X: [12, 14, 33, 35] Z: [14, 33, 75, 119] X: [13, 15, 34, 36] Z: [15, 34, 76, 120] X: [14, 16, 35, 37] Z: [16, 35, 77, 121] X: [15, 17, 36, 38] Z: [17, 36, 78, 122] X: [16, 18, 37, 39] Z: [18, 37, 79, 123] X: [17, 19, 38, 40] Z: [19, 38, 80, 124] X: [18, 20, 39, 41] Z: [20, 39, 81, 125] X: [19, 21, 40, 42] Z: [21, 40, 82, 126] X: [20, 22, 41, 43] Z: [22, 41, 83, 127] X: [21, 23, 42, 44] Z: [23, 42, 84, 128] X: [22, 24, 43, 45] Z: [24, 43, 85, 129] X: [23, 25, 44, 46] Z: [25, 44, 86, 130] X: [24, 26, 45, 47] Z: [26, 45, 87, 131] X: [25, 27, 46, 48] Z: [27, 46, 88, 132] X: [26, 28, 47, 49] Z: [28, 47, 89, 133] X: [27, 29, 48, 50] Z: [29, 48, 90, 134] X: [28, 30, 49, 51] Z: [30, 49, 91, 135] X: [29, 31, 50, 52] Z: [31, 50, 92, 136] X: [30, 32, 51, 53] Z: [32, 51, 93, 137] X: [31, 33, 52, 54] Z: [33, 52, 94, 138] X: [32, 34, 53, 55] Z: [34, 53, 95, 139] X: [33, 35, 54, 56] Z: [35, 54, 96, 140] X: [34, 36, 55, 57] Z: [36, 55, 97, 141] X: [35, 37, 56, 58] Z: [37, 56, 98, 142] X: [36, 38, 57, 59] Z: [38, 57, 99, 143] X: [37, 39, 58, 60] Z: [39, 58, 100, 144] X: [38, 40, 59, 61] Z: [40, 59, 101, 145] X: [39, 41, 60, 62] Z: [41, 60, 102, 146] X: [40, 42, 61, 63] Z: [0, 42, 61, 103] X: [41, 43, 62, 64] Z: [1, 43, 62, 104] X: [42, 44, 63, 65] Z: [2, 44, 63, 105] X: [43, 45, 64, 66] Z: [3, 45, 64, 106] X: [44, 46, 65, 67] Z: [4, 46, 65, 107] X: [45, 47, 66, 68] Z: [5, 47, 66, 108] X: [46, 48, 67, 69] Z: [6, 48, 67, 109] X: [47, 49, 68, 70] Z: [7, 49, 68, 110] X: [48, 50, 69, 71] Z: [8, 50, 69, 111] X: [49, 51, 70, 72] Z: [9, 51, 70, 112] X: [50, 52, 71, 73] Z: [10, 52, 71, 113] X: [51, 53, 72, 74] Z: [11, 53, 72, 114] X: [52, 54, 73, 75] Z: [12, 54, 73, 115] X: [53, 55, 74, 76] Z: [13, 55, 74, 116] X: [54, 56, 75, 77] Z: [14, 56, 75, 117] X: [55, 57, 76, 78] Z: [15, 57, 76, 118] X: [56, 58, 77, 79] Z: [16, 58, 77, 119] X: [57, 59, 78, 80] Z: [17, 59, 78, 120] X: [58, 60, 79, 81] Z: [18, 60, 79, 121] X: [59, 61, 80, 82] Z: [19, 61, 80, 122] X: [60, 62, 81, 83] Z: [20, 62, 81, 123] X: [61, 63, 82, 84] Z: [21, 63, 82, 124]

Code ID 147-21-6 · download JSON · raw on GitHub