ApiComposition

Which path consumes which impairment, and the pair that describes one thing

7/7 passed in 1ms

Test	What it does	Result
test_afterpulse_reaches	Afterpulsing on the decoy family raises the error rate and costs key, and $p_{AP}=0$ is the plain model.	✅ pass
test_backflash_reported	Backflash leaves the rate unchanged and reports leak as $P_b$ times the sifted rate.	✅ pass
test_dead_time_placed	Dead time is refused on the decoy family, whose interleaved intensities have no single rate, and as an impairment on the phase-keyed path, which already models it.	✅ pass
test_dephasing_alone	With no DSP chain q.Dephasing is charged as its own row.	✅ pass
test_dephasing_once	Where the DSP produced a residual only budget.phase(v_err) is charged: a declared q.Dephasing changes no rate and reports v_floor below the residual.	✅ pass
test_dephasing_ordering	A declared linewidth that diffuses further over its delay than the whole estimator residual is a contradiction and raises, naming both variances.	✅ pass
test_family_impairments	A descriptor no path consumes is refused: timing and polarisation on the pinned click path, backflash and detector memory on a quadrature one.	✅ pass