Lesson 020: Two-qubit basis and CNOT scaffolding
Focus
Bias toward repeatable experiment notebooks: circuits, mitigation settings, timestamps. Token Two-qubit basis and CNOT scaffolding:20 keeps neighbouring lessons differentiable.
Key ideas
- Thread: Two-qubit basis and CNOT scaffolding · drill v10 · spin
394548. - Habit: pair each job with shot budget, mitigation profile, and a calibration fingerprint you could paste.
- Guardrail: write one line about where classical cost dominated the timeline.
Deep dive notebook
Synthetic drill artefacts
Simulator-vs-hardware rollup
| Artefact | Honesty check |
|----------|---------------|
| Exact statevector (n<21) | qubit ceiling note |
| Noisy emulation | pauli/channel parity |
| Device trace | leakage / crosstalk tag `med` |
Hypothesis `success amplification lift` ties lesson 20 to observables not vibes.
Practice
Practice Draft three pass/fail checks for fidelity or success probability before widening access. — 20 Bump literals mindset by 39.