Dynamics of quantum discord of two coupled spin-1/2’s subjected to time-dependent magnetic fields

We describe the dynamics of quantum discord of two interacting spin-1/2’s subjected to controllable time-dependent magnetic fields. The exact time evolution of discord is given for various input mixed states consisting of classical mixtures of two Bell states. The quantum discord manifests a complex...

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Bibliographic Details
Published inResults in physics Vol. 13; p. 102147
Main Authors Grimaudo, Roberto, Isar, Aurelian, Mihaescu, Tatiana, Ghiu, Iulia, Messina, Antonino
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.2019
Elsevier
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Summary:We describe the dynamics of quantum discord of two interacting spin-1/2’s subjected to controllable time-dependent magnetic fields. The exact time evolution of discord is given for various input mixed states consisting of classical mixtures of two Bell states. The quantum discord manifests a complex oscillatory behaviour in time and is compared with that of quantum entanglement, measured by concurrence. The interplay of the action of the time-dependent magnetic fields and the spin-coupling mechanism in the occurrence and evolution of quantum correlations is examined in detail.
ISSN:2211-3797
2211-3797
DOI:10.1016/j.rinp.2019.02.083