Phys. Rev. A 71, 022308 (2005) - Thermal entanglement of spins in an inhomogeneous magnetic field

Thermal entanglement of spins in an inhomogeneous magnetic field

M. Asoudeh and V. Karimipour

Phys. Rev. A 71, 022308 – Published 14 February 2005

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 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.

Received 11 July 2004

DOI:https://doi.org/10.1103/PhysRevA.71.022308

©2005 American Physical Society

Authors & Affiliations

M. Asoudeh^* and V. Karimipour^†

Department of Physics, Sharif University of Technology, P.O. Box 11365-9161, Tehran, Iran

^*Email address: asoudeh@mehr.sharif.edu
^†Corresponding author. Email address: vahid@sharif.edu

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Issue

Vol. 71, Iss. 2 — February 2005

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