Author

Artus Krohn-Grimberghe

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Preprint Aug 2026

The entanglement of purification is not additive

The entanglement of purification $E_P$, introduced by Terhal, Horodecki, Leung, and DiVincenzo in 2002, measures the total correlations of a bipartite state by the entanglement needed to purify it; whether it is additive on tensor powers has been open since its introduction. In 2012 Chen and Winter argued"beyond reason...

Artus Krohn-Grimberghe · 1 citation · ⚡1

Preprint Aug 2026

A certified lower bound on the quantum-capacity threshold of the depolarizing channel

The noise threshold below which the qubit depolarizing channel retains positive quantum capacity has been studied since 1996. The classic constructions come with exact finite formulae, but in every reported threshold to date -- most recently the record of Agarwal et al. -- the final step, the sign of the coherent infor...

Artus Krohn-Grimberghe · 1 citation