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- W3190231631 abstract "Recent investigations of the quantum properties of an antiferromagnet in the spin wave approximation have identified the eigenstates as two-mode squeezed sublattice states. The uniform squeezed vacuum and one-magnon states were shown to display a massive sublattice entanglement. Here we expand this investigation and study the squeezing properties of all sublattice Fock states throughout the magnetic Brillouin zone. We derive the full statistics of the sublattice magnon number with wave number $vec k$ in the ground state and show that magnons are created in pairs with opposite wavevectors, hence, resulting in entanglement of both modes. To quantify the degree of entanglement we apply the Duan-Giedke-Cirac-Zoller inequality and show that it can be violated for all modes. The degree of entanglement decrease towards the corners of the Brillouin zone. We relate the entanglement to measurable correlations of components of the Neel and the magnetization vectors, thus, allowing to experimentally test the quantum nature of the squeezed vacuum. The distinct $vec k$-space structure of the probabilites shows that the squeezed vacuum has a nonuniform shape that is revealed through the $vec k$-dependent correlators for the magnetization and the Neel vectors." @default.
- W3190231631 created "2021-08-16" @default.
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- W3190231631 date "2021-08-04" @default.
- W3190231631 modified "2023-10-14" @default.
- W3190231631 title "Theory of quantum entanglement and the structure of two-mode squeezed antiferromagnetic magnon vacuum" @default.
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