Round 2 verification audit for C009

Model: gpt-5

Claim: The qubit Zeeman sublevels |down>=|S1/2,mj=-1/2> and |up>=|S1/2,mj=+1/2> have a frequency splitting of 2 pi x 16.5 MHz in the applied magnetic field of 0.59 mT.

Source alignment: source/main.tex:113-113 (Experiment)

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 the Zeeman splitting g_J mu_B B / h for S1/2 (g_J=2) at B=0.59 mT equals ~16.5 MHz.. 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: 2pi*16.5 MHz at B=0.59 mT. Pure arithmetic identity f=g_J mu_B B/h with g_J=2 (S1/2) gives 16.516 MHz (16.534 with g=2.00226). Relative error 0.09% vs 16.5 MHz, well within the 1% tolerance set by the paper's 3-sig-fig quote. Fully determined by stated B and known constants -> verified.