Round 2 verification audit for C016

Model: gpt-5

Claim: The collective excitation step is implemented as two pulses (t = 2 n pi/delta, n=2) with eta Omega = delta/2, giving Phi = pi/4 and a drive time t = 150 us.

Source alignment: source/main.tex:122-122 (Experiment)

Prior official verdict: partial 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: Verify Phi = n pi (eta Omega)^2 / (2 delta^2) = 2 pi (1/2)^2/2 = pi/4 for eta Omega = delta/2, n=2, and t = 2 n pi/delta ~= 150 us for delta = 2 pi x 14.7 kHz.. 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 partial with failure_reason None and limitations ['paper_text_only_reimplementation']. Notes: Paper: Phi=n pi (etaOmega)^2/(2 delta^2)=pi/4 (n=2, etaOmega=delta/2) and drive time t=150us. The Phi computation is an exact closed-form identity: with etaOmega=delta/2,n=2 it gives exactly pi/4 (0.250 pi) — matches. The t=150us does NOT equal the ideal 2 n pi/delta=136.1us; it equals two 75us ramped segments (C068), pulling the pulse-ramp model from paper text. Phi is verified-grade but the timing relies on a paper assumption -> overall partial.