rung: 4
name: "Factory-Style Cost Rung"
description: "Shift the scalar score away from best-state chasing toward accepted states per cost proxy."
objective: "Optimize accepted encoded magic states per unit cost, using circuit suite cost as a first factory-style proxy."

bootstrap_incumbent:
  seed_style: ry_rz
  encoder_style: cx_chain
  verification: z_only
  postselection: z_only
  ancilla_strategy: reused_single
  optimization_level: 3
  layout_method: dense
  routing_method: basic
  approximation_degree: 1.0
  target_backend: fake_brisbane
  noise_backend: fake_brisbane
  shots: 384
  repeats: 2
  notes: "Throughput-oriented incumbent."

search_space:
  max_challengers_per_step: 6
  dimensions:
    verification: [z_only, both, none]
    postselection: [z_only, all_measured, none]
    ancilla_strategy: [reused_single, dedicated_pair]
    optimization_level: [2, 3]
    layout_method: [dense, sabre]
    routing_method: [basic, sabre]
    shots: [256, 384, 512]

tier_policy:
  cheap_margin: 0.001
  confirmation_margin: 0.0
  cheap_shots: 384
  expensive_shots: 1024
  cheap_repeats: 2
  expensive_repeats: 1
  promote_top_k: 1
  enable_hardware: false
  confirm_incumbent_on_hardware: true
  hardware_budget: 1

score:
  name: factory_throughput
  base_cost: 1.0
  cheap_quality:
    noisy_fidelity: 0.15
    logical_witness: 0.25
    codespace_rate: 0.20
    stability_score: 0.10
    spectator_alignment: 0.10
  expensive_quality:
    logical_witness: 0.40
    codespace_rate: 0.20
    stability_score: 0.10
    spectator_alignment: 0.10
  cost_weights:
    two_qubit_count: 0.10
    depth: 0.02
    shot_count: 0.00040
    runtime_estimate: 0.03
    queue_cost_proxy: 0.50

step_budget: 3
patience: 2

hardware:
  backend_name:
  channel:
  instance:
  token_env_var: QISKIT_IBM_TOKEN