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arXiv · 1310.8311

Practical method to obtain a lower bound to the three-tangle

Christopher Eltschka·Jens Siewert
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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.

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Christopher Eltschka, Jens Siewert. 2014-02-09. Practical method to obtain a lower bound to the three-tangle. https://doi.org/10.1103/physreva.89.022312

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