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

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.

5 pages, 5 figures, few changed, accepted by New J. Phys

References in corpus (7)

• Entanglement in the Quantum Heisenberg XY model
• Separable states are more disordered globally than locally
• Thermal concurrence mixing in a 1D Ising model
• Effects of anisotropy on thermal entanglement
• Thermal entanglement in three-qubit Heisenberg models
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Cited by in corpus (3)

• Entanglement and correlation in anisotropic quantum spin systems
• Entanglement in SU(2)-invariant quantum spin systems
• Entanglement as upper bounded for the nonlocality of a general two-qubit system