Violation of the Bell inequality for thermal states of interaction qubits investigated via a multi-qubit Heisenberg model
Violation of the Bell inequality for thermal states of interaction qubits investigated via a multi-qubit Heisenberg model
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DOI：
10.1088/1367-2630/4/1/311
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发表时间：
2001-11
影响因子：
3.3
通讯作者：
Xiaoguang Wang
中科院分区：
文献类型：
--
作者：
Xiaoguang Wang
研究了多量子比特海森堡模型中量子比特热态对Bell不等式的破坏，它是温度和外磁场的函数。与纠缠的行为不同，这种破坏不能通过增加温度或磁场来获得。发现破坏的阈值温度小于纠缠的阈值温度。我们还考虑了一个现实的腔QED模型，这是一个特殊的情况下，多量子比特海森堡模型。
We study the violations of the Bell inequality for thermal states of qubits in a multi-qubit Heisenberg model as a function of temperature and external magnetic field. Unlike the behaviours of the entanglement, the violation cannot 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 multi-qubit Heisenberg model.