2006/08/11 by Reinaldo O. Vianna, Andrew C. Doherty · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.74.052306
published as Physical Review A, 74, 052306 (2006) · 16 pages, 2 figures
arxiv created 2006/08/11 · arxiv updated 2009/12/01
We use Robust Semidefinite Programs and Entanglement Witnesses to study the distillability of Werner states. We perform exact numerical calculations which show 2-undistillability in a region of the state space which was previously conjectured to be undistillable. We also introduce bases which yield interesting expressions for the \em distillability witnesses and for a tensor product of Werner states with arbitrary number of copies.