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- W3200038223 abstract "We study the global quantum discord (GQD) in the Lipkin-Meshkov-Glick (LMG) model at zero and finite temperatures, in which all spins are mutually interacted and introduced in an external magnetic field (denoted byh). We confirm that the high coordinate number is one of the most distinguishing features of the LMG model, which directly results in the nontrivial behaviors of quantum correlations. We compare the GQD with other quantum correlations measures (such as concurrence, quantum discord, and global entanglement) and find the remarkable difference between them. For instance, we find that GQD spreads in the entire system and captures more information on quantum correlations when comparing with concurrence and quantum (pairwise) discord. We discover that GQD can characterize multipartite correlations in the both broken phase (h 0 in the anisotropic cases for any fixed magnetic field. We further show that GQD behaves asG|sn∼k⋅1N+cwithk< 0 in the isotropic cases for any Dicke state |sn⟩. Hereinkandcare the fitting parameters. We also find that the thermal stability of the GQD at low temperatures depends on the energy gap. We further reveal that the extraordinary behaviors of the thermal-state GQD in the isotropic LMG model are explained by the contribution theory of the energy levels." @default.
- W3200038223 created "2021-09-27" @default.
- W3200038223 creator A5013270677 @default.
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- W3200038223 date "2021-09-13" @default.
- W3200038223 modified "2023-09-23" @default.
- W3200038223 title "Global quantum discord in the Lipkin-Meshkov-Glick model at zero and finite temperatures" @default.
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- W3200038223 doi "https://doi.org/10.1088/1361-648x/ac2647" @default.
- W3200038223 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34517354" @default.
- W3200038223 hasPublicationYear "2021" @default.
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