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Acta Physica Sinica

On the properties and controlling of thermal entanglement in a two-qubit Heisenberg XY model with external magnetic fields

Du Xiu-Mei, Man Zhong-Xiao, Yun‐Jie Xia

Published Jan 1, 2008• 4 citations
Publisher

Abstract

We investigate the thermal entanglement of Heisenberg-type coupled two-qubit system in the presence of two controllable magnetic fields (B+b) and (B-b). We find that under the condition of low temperature and uniform magnetic field, the entanglement between the two qubits exhibits platform-like behavior. By controlling the inhomogeneous magnetic field b and selecting suitable material we can optimize the thermal entanglement and enhance the critical temperature Tc of dead entanglement. We also find that the entanglement switch can be realized in a broader region of temperature by modulating the uniform field B.

DOI
10.7498/aps.57.7457

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