Manuscript Hawk04-A@1 · Hawk04-A.tex · corollary · 526092ba

Corollary: A nearly classical channel is still an obstruction

An exact dynamical negative control › Commuting source couplings · lines 1423–1434 · proof included or linked

If $N_{cl}$ is entanglement breaking and $d_{⋄} (N, N_{cl}) \leq η$ , then

ε_{rec} (N) \geq max {0, 1 - d^{- 1} - η} .

Proof. Use postprocessing contraction and Theorem thm:QND's separable Bell-state argument.

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