MdiForward

Ma and Razavi's MDI-BB84 observables at the limits that pin them

6/6 passed in 0ms

Test	What it does	Result
test_bell_ceiling	Without dark counts Y11 is eta_a*eta_b/2, two of the four Bell states identified.	✅ pass
test_diag_interferes	The diagonal gain over the rectilinear one is 2.000001, 2.000050 and 2.010069 at mu = 1e-5, 0.001 and 0.2.	✅ pass
test_diag_quarter	The diagonal-basis QBER of two independent coherent sources tends to 1/4 + e_d/2 as the signal weakens, not to the misalignment.	✅ pass
test_gain_scaling	Halving one arm efficiency halves the single-photon-pair yield, halving both quarters it.	✅ pass
test_pair_error	Without dark counts the single-photon-pair error rate is the misalignment itself, in both bases and at every arm efficiency.	✅ pass
test_rect_error	Without dark counts the rectilinear error rate is the misalignment at any intensity.	✅ pass