Bound entangled singlet-like states for quantum metrology

• URL: http://arxiv.org/abs/2002.12409v4
• Date: Wed, 25 Aug 2021 14:29:49 GMT
• Title: Bound entangled singlet-like states for quantum metrology
• Abstract summary: Bipartite entangled quantum states with a positive partial transpose (PPT) are usually considered very weakly entangled. We present two classes of ($2dtimes 2d$)-dimensional PPT entangled states for any $dge 2$. We argue that our states could be called "PPT singlets"
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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."

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