Enhanced the thermal Entanglement in Anisotropy XYZ Heisenberg Chain

Details Enhanced the thermal Entanglement in Anisotropy XYZ Heisenberg Chain Enhanced the thermal Entanglement in Anisotropy XYZ Heisenberg Chain

2003-02-12

arxiv.org/abs/quant-ph/0302094v3

Phys. Rev. A 68, 024301 (2003)

Physics

Quantum Physics

4 pages 6 figures. To appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.68.024301

The thermal entanglement in Heisenberg $XYZ$ chain is investigated in the presence of external magnetic field $B$. In the two-qubit system, the critical magnetic field $B_c$ is increased because of introducing the interaction of the z-component of two neighboring spins $J_z$. This interaction not only improves the critical temperature $T_c,$ but also enhances the entanglement for particular fixed $B$. We also analyze the pairwise entanglement between nearest neighbors in three qubits. The pairwise entanglement, for a fixed $T$, can be strong by controlling $B$ and $J_z$. PACS: 03.65. Ud, 03.67. -a, 75.10. Jm

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