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Physics Letters A

Teleportation of single and bipartite states via a two qubits xxz Heizenberg spin chain in a non-Markovian environment

Georges Collince Fouokeng, Edwine Tendong, Alain Giresse Tene, Martin Tchoffo, Lukong Cornelius Fai

Published Jul 14, 2020• 15 citations
Publisher
DOI
10.1016/j.physleta.2020.126719

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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.