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

• URL: http://arxiv.org/abs/2101.07697v1
• Date: Tue, 19 Jan 2021 15:53:13 GMT
• Title: Dynamics of quantum discord of two coupled spin-1/2 subjected to time-dependent magnetic fields
• Authors: Roberto Grimaudo, Tatiana Mihaescu, Aurelian Isar, Iulia Ghiu, Antonino Messina
• Abstract summary: We describe the dynamics of quantum discord of two interacting spin-1/2 subjected to controllable time-dependent magnetic fields. 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.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We describe the dynamics of quantum discord of two interacting spin-1/2 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.

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