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.
Grimaudo R., Isar A., Mihaescu T., Ghiu I., Messina A. (2019). Dynamics of quantum discord of two coupled spin-1/2’s subjected to time-dependent magnetic fields. RESULTS IN PHYSICS, 13 [10.1016/j.rinp.2019.02.083].
Dynamics of quantum discord of two coupled spin-1/2’s subjected to time-dependent magnetic fields
GRIMAUDO, Roberto
;Messina, Antonino
2019-01-01
Abstract
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.
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