Round 2 verification audit for C057

Model: gpt-5

Claim: The error-sensitivity simulations use delta = 2 pi x 15 kHz, t = 2 pi/delta = 66.6 us, eta = 0.028, Omega = delta/(2 eta) = 2 pi x 265 kHz, with the state initialised in |down,down> and the motional ground state.

Source alignment: source/supp_content.tex:100-101 (Supp. Mat. S3)

Prior official verdict: verified with failure_reason None.

Executable evidence: run.py. Sandbox rerun logs: run.log.

Independent audit: I scanned the copied script for imports/shared helper dependencies and reran it through the sandbox. The code is self-contained in this attempt directory and targets the claim strategy: Check t = 2 pi/delta = 66.6 us and Omega = delta/(2 eta) = 2 pi x 265 kHz are internally consistent for delta=2 pi x 15 kHz, eta=0.028.. I checked the relevant family model rather than relying only on exit status; the rerun is treated as one reproducibility input.

Decision: Round 2 verdict is verified with failure_reason None and limitations []. Notes: Paper: delta=2pi15kHz, t=2pi/delta=66.6us, eta=0.028, Omega=delta/(2eta)=2pi265kHz. Computed: t=66.667us (matches 66.6 to rounding); Omega=delta/(20.028)=2pi267.86kHz, which paper rounds to 2pi*265kHz (1.08% off, plain rounding). Internally consistent. The tex 't=2 pi delta' is a typo for 2 pi/delta, confirmed by the 66.6us value. Verified (pure arithmetic, rounding noted).