ExpZhangLongHaul

Tier B: Zhang et al. 2020, six measured CV points to 202.81 km

6/6 passed in 1ms

Test	What it does	Result
test_zhang_attenuation	Their loss column over length gives 0.15988 to 0.16816 dB/km against a stated 0.16 without splices, three of six on it exactly.	✅ pass
test_zhang_curve	Through their clock, overhead and FER the asymptotic rate upper-bounds K_finite at all six points, 1.0056 to 9.39 times, and 3.97 times at 202.81 km on the worst-case ${\xi }^{\prime }$, the Tier A anchor's 5.5e-5 bit/symbol.	✅ pass
test_zhang_deficit	Declared miss: their $(1-\kappa )=7.6$e-5 carries 72.8% of the measured $\xi$ at 27.27 km and 7.2% at 202.81 km, against their naming residual phase noise the main contribution.	✅ pass
test_zhang_forms	Their $V_A(1-e^{-v_{err}})$ phase form agrees with qkd's literature and estimator forms to 1.9e-5 and 1.8e-4 relative at $v_{err}$ = 7.600e-5 rad^2.	✅ pass
test_zhang_scaling	The log-log slope against end-to-end transmittance is 1.658 measured, the steepest, against 1.266 asymptotic and 1.419 worst-case.	✅ pass
test_zhang_snr	Their SNR column recomputed from $V_A$, $T$, $v_{el}$ and $\xi$ needs 0.020-0.290 dB of loss the "without splices" attenuation leaves unreported.	✅ pass