Round 2 verification audit for C020

Model: gpt-5

Claim: Averaged over all the data, the singlet fidelity is 93(1)% at 16 cycles of the protocol.

Source alignment: source/main.tex:132-132 (Experiment); source/main.tex:63-63 (Abstract); source/main.tex:163-163 (Conclusions)

Prior official verdict: not_verified with failure_reason data_unavailable.

Executable evidence: none. Sandbox rerun logs: none.

Independent audit: I checked the paper inventory and source context. This claim depends on measured/raw experimental data or device-specific calibration values, and inventory.json records no paper-provided dataset/code artifact. The correct action is not to synthesize data; the data_unavailable verdict is preserved.

Decision: Round 2 verdict is not_verified with failure_reason data_unavailable and limitations ['data_unavailable']. Notes: Measured headline value: singlet fidelity 93(1)% at 16 cycles, averaged over all data (Fig.2/abstract/conclusions). No paper-provided raw data (inventory.json). Cannot reproduce a measurement; never synthesize. Internal-consistency check: error 0.07(1)=1-0.93 matches paper's 3.2p model for p~0.02 (3.20.02=0.064), so consistent, but not verifiable without the dataset. Verdict: data_unavailable.