Lesson 168: Two-qubit basis and CNOT scaffolding
Focus
Prefer falsifiable hypotheses (shot count, fidelity floor) over buzzword proofs-of-concepts. Token Two-qubit basis and CNOT scaffolding:168 keeps neighbouring lessons differentiable.
Key ideas
- Thread: Two-qubit basis and CNOT scaffolding · drill v8 · spin
848406. - 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<19) | qubit ceiling note |
| Noisy emulation | pauli/channel parity |
| Device trace | leakage / crosstalk tag `med` |
Hypothesis `parity oscillation damping` ties lesson 168 to observables not vibes.
Practice
Practice Draft three pass/fail checks for fidelity or success probability before widening access. — 168 Bump literals mindset by 12.