C028 - Fig. 3b: comparison of steady-state errors for uncorrelated (solid) versus correlated (da...
Verdict: partial
Location: Fig. 3b
Type / expected artifact: plot / figure (errors_bit_flip.pdf)
Claim: Fig. 3b: comparison of steady-state errors for uncorrelated (solid) versus correlated (dashed) errors, showing correlations increase fidelity for similar constituent operators.
Models: extraction claude-opus-4-8; verification gpt-5; verification_chain claude-opus-4-8 -> gpt-5; verdict_chain partial -> partial.
Limitations: visual_match_only, paper_text_only_reimplementation.
Source location(s): source/main.tex:139-145 (Fig. 3b).
Conclusion
Reproduced uncorrelated (solid) vs correlated (dashed) steady-state error curves. Correlated bit-flip ~3.07p (paper ~3.2p) < uncorrelated bit-flip ~6.03p (paper ~5.2p): confirms correlations increase fidelity for similar constituent operators (the claim). Correlated phase-flip ~0 (DFS). Uncorrelated bit-flip coeff ~16% above paper due to channel parametrisation, but the qualitative ordering claimed is reproduced. Theory-reproducible plot; Tier-A visual match only -> caps at partial.
Verification details
Executable rerun: run.py exited 0 in 0.775s; log verification/C028/attempts/R002/run.log.
Output excerpt:
uncorrelated bit-flip (X) coeff: 6.03 (paper ~5.2)
correlated bit-flip (X) coeff: 3.07 (paper ~3.2)
uncorrelated phase-flip (Z) coeff: 3.99
correlated phase-flip (Z) coeff: 0.0 (paper: leaves fidelity unaffected, DFS)
ordering: correlated bit-flip error < uncorrelated bit-flip error? True
wrote figure.png
Plot evidence:
Visual comparison notes: - Reproduced steady-state singlet error vs probability p for uncorrelated (solid) and correlated (dashed) bit-flip (X) and phase-flip (Z) errors. Ordering matches paper Fig 3b: uncorrelated (solid) lies above correlated (dashed) for the bit-flip, confirming the claim that correlations increase the fidelity for similar constituent operators. - Correlated bit-flip coefficient ~3.07 p (paper ~3.2 p, within ~4%). Uncorrelated bit-flip coefficient ~6.03 p vs paper's ~5.2 p (~16% high) -- attributable to the exact parametrisation of the uncorrelated two-ion channel; the qualitative ordering (the substance of the claim) is correct. - Correlated phase-flip (Z, dashed) gives ~0 error, reproducing the paper's statement that correlated phase-flips leave the fidelity unaffected (|Psi-> in a decoherence-free subspace). - Tier-A visual comparison only; no raw data and no digitization.
