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quant-ph2000
A counterexample to a conjectured entanglement inequality
R. F. Werner, K. G. H. Vollbrecht
We give an explicit counterexample to an entanglement inequality suggested in a recent paper [quant-ph/0005126] by Benatti and Narnhofer. The inequality would have had far-reaching…
quant-ph2000
Separability properties of tripartite states with UxUxU-symmetry
T. Eggeling, R. F. Werner
We study separability properties in a 5-dimensional set of states of quantum systems composed of three subsystems of equal but arbitrary finite Hilbert space dimension. These are t…
math-ph2000
On some additivity problems in quantum information theory
G. G. Amosov, A. S. Holevo, R. F. Werner
A class of problems in quantum information theory, having an elementary formulation but still resisting solution, concerns the additivity properties of various quantities character…