40 citations · 66 across the 2 of their papers we have counts for
5 papers
Characterization of Distillable and Activable States using Entanglement Witnesses
B. Kraus, M. Lewenstein, J. I. Cirac
We introduce a formalism that connections entanglement witnesses and the distillation and activation properties of a state. We apply this formalism to two cases: First, we rederive…
Separability and entanglement in 2x2xN composite quantum systems
S. Karnas, M. Lewenstein
We investigate separability and entanglement of mixed states in three party quantum systems. We show that all states with positive pa…
Separable approximations of density matrices of composite quantum systems
S. Karnas, M. Lewenstein
We investigate optimal separable approximations (decompositions) of states rho of bipartite quantum systems A and B of arbitrary dimensions MxN following the lines of Ref. [M. Lewe…
Optimization of entanglement witnesses
M. Lewenstein, B. Kraus, J. I. Cirac +1
An entanglement witness (EW) is an operator that allows to detect entangled states. We give necessary and sufficient conditions for such operators to be optimal, i.e. to detect ent…
Separability in 2xN composite quantum systems
B. Kraus, J. I. Cirac, S. Karnas +1
We analyze the separability properties of density operators supported on $\C^2\otimes \C^N$ whose partial transposes are positive operators. We show that if the rank of equals…