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No-local-broadcasting theorem for quantum correlations
Marco Piani, Pawel Horodecki, Ryszard Horodecki
We prove that the correlations present in a multipartite quantum state have an \emph{operational} quantum character as soon as the state does not simply encode a multipartite class…
Separability in terms of a single entanglement witness
Piotr Badziąg, Paweł Horodecki, Ryszard Horodecki +1
The separability problem is formulated in terms of a characterization of a single entanglement witness. More specifically, we show that any (in general multipartite) state \varrho…
Entanglement-swapping boxes and their communication properties
Andrzej Grudka, Michal Horodecki, Pawel Horodecki +2
We pose the fundamental question of communication properties of primitives irrespectively of their implementation. To illustrate the idea we introduce the concept of entanglement-s…