Violation of Bell inequality for thermal states of interaction qubits via a multi-qubit Heisenberg model release_mgra4ue63rhgnhims7noifczke

by Xiaoguang Wang

Released as a article .

2002  

Abstract

We study the violations of Bell inequality for thermal states of qubits in a multi-qubit Heisenberg model as a function of temperature and external magnetic fields. Unlike the behaviors of the entanglement the violation can not be obtained by increasing the temperature or the magnetic field. The threshold temperatures of the violation are found be less than that of the entanglement. We also consider a realistic cavity-QED model which is a special case of the mutli-qubit Heisenberg model.
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Date   2002-02-27
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