Finite-blocklength superactivation is certified numerically for 17 uses of the joint 50% erasure and PPT channel, enabling qubit transmission with fidelity impossible using any number of uses of either channel separately.
If the outcome of the measurement isℓ, he applies the correction X −ℓ B′ 1 (·) :=X −ℓ B′ 1 (·)X ℓ B′ 1 to the key systemB ′
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Onset of superactivation of quantum capacity
Finite-blocklength superactivation is certified numerically for 17 uses of the joint 50% erasure and PPT channel, enabling qubit transmission with fidelity impossible using any number of uses of either channel separately.