Year: 2021
Type: article
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 × 2d)-dimensional PPT entangled states for any d 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."
Source: Physical Review Research
Authors: Károly F. Pál, Géza Tóth, Erika Bene, Tamás Vértesi
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
Funders: Alexander von Humboldt-Stiftung, Ministerio de Ciencia, Innovación y Universidades, European Cooperation in Science and Technology, Agence Nationale de la Recherche, Eusko Jaurlaritza, Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, QuantERA, European Regional Development Fund, Agencia Estatal de Investigación, National Research, Development and Innovation Office
Awards: G1044755706, G15821529, G298511182, G3161857774, G3209485537, G3510600673, G4098316781, G4553253017, G4568777066, G4651337954, G4833133300, G5041408995, Controling EPR and Bell correlations in atomic Bose-Einstein condensates, G5471176184, G6386978087, G6392224089, G6728930308, G6731467812, G7233901060, G7472709510, G7627621740, G7750642748, G8840635553
OpenAlex ID: W3098282216