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Quantum dynamics of spins in a time-dependent field

Seiji Miyashita, Kosuke Saito, H. Kobayashi, Hans A. De Raedt

Published Jan 1, 2000• 2 citations
OpenAlex

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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.