Phys. Rev. Lett. 88, 107901 (2002) [4 pages]Anisotropy and Magnetic Field Effects on the Entanglement of a Two Qubit Heisenberg XY ChainReceived 28 September 2001; published 26 February 2002 We investigate the entanglement of a two-qubit anisotropic Heisenberg XY chain in thermal equilibrium at temperature T in the presence of an external magnetic field B along the z axis. By means of the combined influences of anisotropic interactions and a magnetic field B, one is able to produce entanglement for any finite T, by adjusting the magnetic field strength. This contrasts with the isotropic interaction or the B = 0 cases, for which there is no entanglement above a critical temperature Tc that is independent of the external B field. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.107901
DOI:
10.1103/PhysRevLett.88.107901
PACS:
03.65.Ud, 03.67.-a, 05.50.+q, 75.10.Jm
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