Entanglement in bipartite X-states: Analytical results for the volume of states with positive partial transpose

Abstract

We provide an analytical formula for the volume ratio between bipartite X-states with positive partial transpose and all bipartite X-states. The result applies to arbitrary $m\times n$-bipartite systems and the volume expressions are derived with respect to the Hilbert-Schmidt measure.

arXiv comment13 pages

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