Phys. Rev. A 71, 022308 (2005) [6 pages]Thermal entanglement of spins in an inhomogeneous magnetic fieldReceived 11 July 2004; published 14 February 2005 We study the effect of inhomogeneities in the magnetic field on the thermal entanglement of a two-spin system. We show that in the ferromagnetic case a very small inhomogeneity is capable of producing large values of thermal entanglement. This shows that the absence of entanglement in the ferromagnetic Heisenberg system is highly unstable against inhomogeneity of magnetic fields, which is inevitably present in any solid state realization of qubits. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.022308
DOI:
10.1103/PhysRevA.71.022308
PACS:
03.67.Mn, 03.65.Ud, 75.10.Jm
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