3 papers
quant-ph2001
Can spectral and local information decide separability?
Karl G. H. Vollbrecht, Michael M. Wolf
We discuss the discriminating power of separability criteria, which are based on the spectrum of a quantum state and its reductions. Common examples are entropic inequalities utili…
quant-ph2001
Comment on: Necessary and sufficient condition of separability of any system
T. Eggeling, K. G. H. Vollbrecht, M. M. Wolf
In a recent paper (quant-ph/0102133) Chen, Liang, Li and Huang suggest a necessary and sufficient separability criterion, which is supposedly practical in judging the separability…
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…