Phys. Rev. A 68, 024301 (2003) [4 pages]Enhanced thermal entanglement in an anisotropic Heisenberg XYZ chainReceived 13 February 2003; revised 23 April 2003; published 6 August 2003 The thermal entanglement in the Heisenberg XYZ chain is investigated in the presence of an external magnetic field B. In the two-qubit system, the critical magnetic field Bc is increased by introducing the interaction of the z component of two neighboring spins Jz. This interaction not only improves the critical temperature Tc, but also enhances the entanglement for a particular fixed B. We also analyze the pairwise entanglement between nearest neighbors in three qubits. The pairwise entanglement, for a fixed T, can become strong by controlling B and Jz. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.024301
DOI:
10.1103/PhysRevA.68.024301
PACS:
03.67.Mn, 03.65.-w, 75.10.Jm
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