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

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  • 30 November 2001
Abstract
We study the violations of Bell inequality and reduction criteria 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 violations can not be obtained by increasing the temperature or the magnetic field. The critical temperatures of the violations 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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