Stable Core Contract Fixtures

May 18, 2026 · View on GitHub

These no-QPU, no-network fixtures lock stable core contract payloads.

Fixture summary

Problem ID	Kind	Qubits	Initial state	Coupling matrix	Omega	Metadata
`ring4`	`kuramoto_xy`	4	`0011`	`[[0.0, 0.45, 0.0, 0.45], [0.45, 0.0, 0.45, 0.0], [0.0, 0.45, 0.0, 0.45], [0.45, 0.0, 0.45, 0.0]]`	`[0.8, 0.9, 1.1, 1.2]`	`{"domain": "stable-core", "source": "fixture"}`
`chain3`	`kuramoto_xy`	3	`010`	`[[0.0, 0.55, 0.0], [0.55, 0.0, 0.55], [0.0, 0.55, 0.0]]`	`[1.0, 0.95, 1.05]`	`{"domain": "stable-core", "lane": "chain", "source": "fixture"}`

Backend ID	Kind	Capabilities	Hardware submission	Metadata
`classical-reference`	`classical_reference`	order_parameter, parity, fim, control	`False`	`{"role": "baseline"}`
`hardware-replay`	`hardware_replay`	order_parameter, parity, mitigation_replay	`False`	`{"role": "planner-replay"}`
`qiskit-runtime`	`qiskit`	order_parameter, parity, mitigation_replay	`False`	`{"role": "adapter"}`
`qiskit-runtime-live`	`qiskit`	order_parameter, parity, mitigation_replay	`True`	`{"mode": "fixture", "role": "hardware-path"}`
`qutip-dynamics`	`qutip`	order_parameter, hamiltonian_dynamics, lindblad	`False`	`{"role": "open-system"}`
`pennylane-autodiff`	`pennylane`	order_parameter, parity, control, autodiff	`False`	`{"role": "autodiff"}`
`pulser-surrogate`	`pulser_surrogate`	order_parameter, analog_surrogate, pulse_schedule	`False`	`{"role": "analog"}`

Experiments

Experiment ID	Problem ID	Backend ID	Objective	Seed	Shots	Metadata
`exp-ring4-order-classical`	`ring4`	`classical-reference`	`order_parameter`	`17`	`1024`	`{}`
`exp-ring4-parity-replay`	`ring4`	`hardware-replay`	`parity_leakage`	`23`	`512`	`{}`
`exp-chain3-mitigation-qiskit`	`chain3`	`qiskit-runtime`	`mitigation_replay`	`31`	`None`	`{}`
`exp-chain3-fim-qutip`	`chain3`	`qutip-dynamics-fallback`	`order_parameter`	`41`	`256`	`{"fixture": "fim"}`
`exp-ring4-control-live`	`ring4`	`classical-control`	`control_cost`	`7`	`None`	`{"control_profile": "l2"}`
`exp-ring4-order-qiskit-live`	`ring4`	`qiskit-runtime-live`	`order_parameter`	`53`	`None`	`{"preregistration_id": "fixture-001"}`

Experiment ID	Backend ID	Status	Observables	Blockers	Artifacts
`exp-ring4-order-classical`	`classical-reference`	`succeeded`	`{"order_parameter": 0.742}`	`none`	`artifacts/exp-ring4-order-classical.json`
`exp-ring4-parity-replay`	`hardware-replay`	`succeeded`	`{"parity_leakage": 0.91}`	`none`	`none`
`exp-chain3-mitigation-qiskit`	`qiskit-runtime`	`blocked`	`{}`	mitigation replay requires calibrated parity observables	`none`
`exp-chain3-fim-qutip`	`qutip-dynamics-fallback`	`failed`	`{}`	offline fixture path forbids hardware execution	`none`
`exp-ring4-control-live`	`classical-control`	`succeeded`	`{"control_cost": 0.27}`	`none`	`artifacts/exp-ring4-control-live.json`
`exp-ring4-order-qiskit-live`	`qiskit-runtime-live`	`blocked`	`{}`	live qiskit path intentionally disabled in stable-core fixtures	`none`

Regenerate and compare these fixtures with:

python scripts/run_stable_core_contract_gate.py

Stable-core contract fixtures are deterministic shape checks only. They do not execute on hardware or invoke external providers.