{
 "schema_version": "0.1",
 "name": "[[103,30,7]] shortened pair-partition CPM code",
 "code_type": "CSS",
 "n": 103,
 "k": 30,
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 "distance": {
  "d": 7,
  "X": {
   "value": 8,
   "confidence": "upper_bound",
   "witness": [
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  "Z": {
   "value": 7,
   "confidence": "upper_bound",
   "witness": [
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 },
 "provenance": {
  "authors": [
   "@davidplu"
  ],
  "construction": "Shorten the X-check row space at parent qubit 0 and puncture the Z checks at that qubit, starting from codes/104-30-8.json. Use the first X check containing qubit 0 as pivot, XOR it into every other X check containing that qubit, remove the pivot check, and delete column 0 from both matrices.",
  "references": [
   "arXiv:2607.14091"
  ],
  "date": "2026-09-29",
  "notes": "Derived from the Jong Yeon Lee pair-partition CPM baseline, not an independent discovery of that construction. Literature novelty of the shortened parameters is unverified. The parent entry is codes/104-30-8.json at upstream commit c665b033956000ca1c058de851b8cd25b1ab289b. The initial trusted board comparison found no exact duplicate or WL-equivalent entry; the differing blocklength also rules out equivalence to the parent by a qubit permutation. The cost of saving one physical qubit is a distance bound of 7 rather than 8 and maximum check weight 14 rather than 8. Independent RIS screens at 10,000, 100,000 and 2,000,000 trials per side all returned 7 (seeds 290927, 290928, 290930, pair depth 16, two threads). No exact-distance or literature-novelty claim is made.",
  "model": "GPT-6 (Codex)",
  "origin": "submission",
  "novelty": "unknown"
 },
 "family": "other"
}