{
 "schema_version": "0.2",
 "name": "priced-calculus-15-7-3",
 "code_type": "CSS",
 "n": 15,
 "k": 7,
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 "distance": {
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  "X": {
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   "confidence": "upper_bound",
   "witness": [
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   "witness_provenance": {
    "found_by": [
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    "date": "2026-10-31",
    "found_at_samples": 1000,
    "survived_samples": 1000,
    "tool": "research/kit/surrogate.lightest_logical",
    "seeds": [
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  "Z": {
   "value": 3,
   "confidence": "upper_bound",
   "witness": [
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   "witness_provenance": {
    "found_by": [
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    "date": "2026-10-31",
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    "survived_samples": 1000,
    "tool": "research/kit/surrogate.lightest_logical",
    "seeds": [
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 "provenance": {
  "authors": [
   "@mathysrennela"
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  "construction": "priced calculus E-PUNCTURE transform of codes/16-6-4.json",
  "references": [],
  "date": "2026-10-31",
  "notes": "",
  "model": "Beam 1.0"
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 "locality": {
  "coordinates": [
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  "layers": 1,
  "contributed_by": {
   "by": [
    "@vprusso"
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   "date": "2026-11-04",
   "method": "Inherited from the laid-out parent codes/16-6-4.json: the parent's coordinates with the entry of the removed qubit (parent index 1) dropped, since this puncture child keeps the parent's qubit order. Radius, layer count, and class re-measured by the verifier."
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 },
 "circuit": {
  "d_circ": {
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    "confidence": "upper_bound",
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   "X": {
    "value": 3,
    "confidence": "upper_bound",
    "witness": [
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  "rounds": 3,
  "stim_version": "1.16.0",
  "notes": "Johnson-coil + 4 span flags sequential extraction (max_flags=4 per check, 8 X + 8 Z edge-colored data CX layers per round, coloring candidate 0); generated by qldpc submit (research/circuit_autogen.py, seed 0), the first of up to 6 candidates whose RIS screen at 2 rounds found nothing below d; witnesses from RIS on ker(H_dem) at twice the gate's trial budget, validated in GF(2)",
  "contributed_by": {
   "by": [
    "@vprusso"
   ],
   "date": "2026-11-06",
   "method": "circuit_autogen schedule search (two-block interleaved, then layout, then generic), verified by verify/circuit_verify.py before writing"
  }
 }
}