3 papers
quant-ph2026
Fundamental limitations on entanglement extraction from purity
Tulja Varun Kondra, Pedro Barrios Hita, Justus Neumann +2
States of sufficiently low purity are separable and cannot be entangled by unital (purity-non-generating) operations. Since high-purity states are experimentally demanding, it is n…
quant-ph2026
The relative entropy of magic and its nonadditivity
Carolin Deckers, Justus Neumann, Hermann Kampermann +1
In most stabilizer-based quantum computing schemes, so-called magic states are a necessary resource for implementing non-transversal quantum gates. With the resource theory of magi…
quant-ph2026
Bounds on quantum conference key agreement in pair-entangled networks
Justus Neumann, Hermann Kampermann, Dagmar Bruà +1
We investigate the task of conference key agreement in near-term quantum networks, where the nodes are connected by sources of bipartite entangled states, under the class of local…