Physics – Quantum Physics
Scientific paper
2010-06-04
Quantum Inf. Comput. 11 1 & 2 (2011), 104-123
Physics
Quantum Physics
19 pages, see also arXiv:0909.3907
Scientific paper
We consider the problem of computing the family of operator norms recently introduced in arXiv:0909.3907. We develop a family of semidefinite programs that can be used to exactly compute them in small dimensions and bound them in general. Some theoretical consequences follow from the duality theory of semidefinite programming, including a new constructive proof that there are non-positive partial transpose Werner states that are r-undistillable for arbitrary r. Several examples are considered via a MATLAB implementation of the semidefinite program, including the case of Werner states and randomly generated states via the Bures measure, and approximate distributions of the norms are provided. We extend these norms to arbitrary convex mapping cones and explore their implications with positive partial transpose states.
Johnston Nathaniel
Kribs David W.
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