Thermal entanglement of spins in a nonuniform magnetic field

Abstract

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 to produce large values of thermal entanglement. This shows that the absence of entanglement in the ferromagnetic Heisenberg system is highly unstable against inhomogeneoity of magnetic fields which is inevitably present in any solid state realization of qubits.

14 pages, 7 figures, latex, Accepted for publication in Physical Review A

References in corpus (1)

• Separability conditions and limit temperatures for entanglement detection in two qubit Heisenberg XYZ models

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