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

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

2001-11-30

arxiv.org/abs/quant-ph/0111165v4

New Journal of Physics 4, 11.1-11.9 (2002).

Physics

Quantum Physics

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

Scientific paper

10.1088/1367-2630/4/1/311

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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