Practical method to obtain a lower bound to the three-tangle
Quantum Physics
2014-03-17 v2
Abstract
The quantitative assessment of the entanglement in multipartite quantum states is, apart from its fundamental importance, a practical problem. Recently there has been significant progress in developing new methods to determine certain entanglement measures. In particular, there is a method---in principle, analytical---to compute a certified lower bound for the three-tangle. The purpose of this work is to provide a manual for the implementation of this approach and to explicitly discuss several analytically solvable cases in order to gauge the numerical tools. Moreover, we derive a simple analytical bound for the mixed state three-tangle.
Cite
@article{arxiv.1310.8311,
title = {Practical method to obtain a lower bound to the three-tangle},
author = {Christopher Eltschka and Jens Siewert},
journal= {arXiv preprint arXiv:1310.8311},
year = {2014}
}
Comments
9 pages, 4 figures, typo in important Eq (14) corrected, section on tomography added