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Alice’s input stateA ′ 1 is coherently copied intoA ′ 2 by applying a generalized controlled-NOT gateU CNOT A′ 1A′ 2 (·) =U CNOT A′ 1A′ 2 (·)U CNOT A′ 1A′ 2 , defined by the unitar

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quant-ph 1

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2026 1

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Onset of superactivation of quantum capacity

quant-ph · 2026-04-29 · unverdicted · novelty 7.0

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.

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  • Onset of superactivation of quantum capacity quant-ph · 2026-04-29 · unverdicted · none · ref 3

    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.