BlindChannel

The simulated channel against Pereira, Curty & Tamaki's printed expressions

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Test	What it does	Result
test_biterror	At zero flaw the bit error is Pereira's printed e_Z verbatim.	✅ pass
test_dark	Flaw and dark counts combine through Pereira's expression with the flaw carried as one minus twice the intrinsic error.	✅ pass
test_excess	At unit efficiency the published yield exceeds one by exactly twice the dark count: a defect quoted from the paper rather than repaired.	✅ pass
test_intrinsic	With dark counts off, the bit error is the averaged misalignment of Alice's two Z states against Bob's rotated analyser.	✅ pass
test_yield	The single-photon yield is Pereira's Y_Z = 4(1 - eta/2) p_d + eta.	✅ pass