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Generation of a maximally entangled state using collective optical pumping

verification/C025/attempts/R002/claim_report.md

C025 - A bit-flip error with probability p per cycle reduces the singlet fidelity by ~= 5.2 p wh...

Verdict: verified Location: Theoretical error analysis; Supp. Mat. S2 Type / expected artifact: numeric / math / numeric Claim: A bit-flip error with probability p per cycle reduces the singlet fidelity by ~= 5.2 p when uncorrelated and ~= 3.2 p when correlated. Models: extraction claude-opus-4-8; verification gpt-5; verification_chain claude-opus-4-8 -> gpt-5; verdict_chain verified -> verified. Source location(s): source/main.tex:145 (Theoretical error analysis).

Conclusion

Steady-state singlet error vs p at optimal Phi=pi/4, gamma=0.221pi, theta=0.716pi, error after drive (A), via 8000-cycle power iteration. Uncorrelated = local M_{x,0}=exp(-i(pi/2)X_e (x) I); correlated = U_x(sqrt(2p)); both parametrized so one-cycle one-ion-flip prob = p. Fitted slopes (p<0.01): uncorrelated 5.25/5.11 -> rounds 5.2; correlated 3.18/3.13 -> rounds 3.2. Paper: 5.2p and 3.2p. Match within tolerance; ratio ~1.65 confirms correlated gives lower steady-state error. Verified.

Verification details

Executable rerun: run.py exited 0 in 0.518s; log verification/C025/attempts/R002/run.log.

Output excerpt:

p=0.001: one-ion-flip prob (matched param)  uncorr=1.000000e-03  corr=9.993335e-04  (target 1.000000e-03)
p=0.005: one-ion-flip prob (matched param)  uncorr=5.000000e-03  corr=4.983356e-03  (target 5.000000e-03)
   p          err_uncorr      err_corr      ratio
  5.0e-05   2.624963e-04   1.588850e-04   1.652
  1.0e-04   5.248329e-04   3.177132e-04   1.652
  2.0e-04   1.049028e-03   6.352000e-04   1.651
  5.0e-04   2.617798e-03   1.586304e-03   1.650
  1.0e-03   5.219766e-03   3.166970e-03   1.648
  2.0e-03   1.037678e-02   6.311510e-03   1.644
  5.0e-03   2.548233e-02   1.561297e-02   1.632

Supporting files