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International Journal of Theoretical Physics

The Effect of Magnetic Field on the Dynamic Evolution of Quantum Entanglement in the Four-Qubit Heisenberg XXZ Model with DM Interaction and KSEA Interaction

Song Jon, Jie He, Yibang Han, Se-Jong Ryo, Sin Chang-Rim

Published Nov 15, 2025• 0 citations
Publisher
DOI
10.1007/s10773-025-06147-7

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We investigate the exact entanglement dynamics of a two-qubit Heisenberg XXZ chain with Dzyaloshinskii-Moriya (DM) interactions, interacting with an anisotropic spin bath in thermal equi- librium at a temperature T, driven by an external magnetic field B along the z-axis. We establish that, for an initially entangled qubit pair, the DM interactions generate entanglement and enhance the entanglement in the revival region. The effects of the DM interaction are also seen to be very important at high temperatures and for weak coupling between the two qubits where it is seen to preserve entanglement. These effects are weakened when the magnetic field B and the Heisenberg coupling are switched on. If the two-qubits are prepared in an initially separable state, the DM in- teraction instead has a negative effect on their entanglement. On a whole entanglement can better be preserve in the spin chain even at high temperatures by increases the external magnetic field B and the Heisenberg couplings, and by tuning the strength of the DM interaction.