{
  "schema": "classical-reconstruction-model-competition/v1",
  "dataset_id": "carosini-2026-qdot-g2-pre-fiber",
  "target": {
    "g2_zero": 0.021319517718349962,
    "poisson_sigma": 7.630834297654814e-05
  },
  "models": {
    "one_input_independent_threshold": {
      "status": "RED",
      "best_possible_g2_lower_bound": 1.0,
      "minimum_abs_residual": 0.97868048228165,
      "reason": "For common positive pulse intensity and independent identical monotone detectors, g2=E[p^2]/E[p]^2 >= 1."
    },
    "two_input_stochastic_interference_threshold": {
      "status": "FIT_TARGET_ONLY",
      "equations": "I1,2=(1+z +/- 2*sqrt(z)*cos(phi))/2; p=logistic((I-threshold)/noise)",
      "best": {
        "background_to_signal": 0.32,
        "threshold": 1.45,
        "noise": 0.16,
        "g2_model": 0.021299507778796353,
        "single1": 0.046790930044135155,
        "single2": 0.046790930044135155,
        "same_pulse": 4.663295349787727e-05,
        "abs_residual": 2.0009939553609912e-05,
        "z_residual": -0.26222479447312297
      },
      "candidates_total": 16359,
      "within_1sigma": 2,
      "within_3sigma": 14,
      "full_grid_file": "qdot-g2-model-grid-v1.csv"
    },
    "detector_refractory_only_v04": {
      "status": "NOT_COMPARABLE",
      "reason": "The earlier sandbox measured one-detector close-pair suppression, not two-detector HBT cross-correlation."
    }
  },
  "physical_bill": [
    "Second beam-splitter input must carry a stochastic field with independently justified mode energy and phase statistics.",
    "Detector response curve and threshold must be measured rather than fitted.",
    "Full 7000-bin peak shapes, singles rates, power dependence, and changed beam-splitter ratios remain untested."
  ],
  "scope_exclusion": "Matching one integrated g2 statistic does not establish a microscopic classical source theory. The candidate earns a mechanism-level lead, not Q4 or Q5."
}