Bound entangled singlet-like states for quantum metrology

Abstract

Bipartite entangled quantum states with a positive partial transpose (PPT), i.e., PPT entangled states, are usually considered very weakly entangled. Since no pure entanglement can be distilled from them, they are also called bound entangled. In this paper we present two classes of ($2d\times 2d$)-dimensional PPT entangled states for any $d\ge 2$ which outperform all separable states in metrology significantly. We present strong evidence that our states provide the maximal metrological gain achievable by PPT states for a given system size. When the dimension $d$ goes to infinity, the metrological gain of these states becomes maximal and equals the metrological gain of a pair of maximally entangled qubits. Thus, we argue that our states could be called "PPT singlets."

arXiv comment17 pages including 3 figures, revtex4.2; v2: presentation improved, some further results added, links to MATLAB programs generating the bound entangled states added; v3: published version; v4: published version, typo fixed in the first author's name in Ref. [8] and elsewhere

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