Quantum phase transition and entanglement in Heisenberg XX spin chain with impurity

Quantum phase transition and entanglement in Heisenberg XX spin chain with impurity
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海森堡XX自旋链中的量子相变和杂质纠缠

DOI:
10.1088/1674-1056/19/5/050304
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发表时间:
2010-05
期刊:
影响因子:
1.7
通讯作者:
Xia Yun-Jie
Xia Yun-Jie
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Chen Shi-Rong;Man Zhong-Xiao;Xia Yun-Jie

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本文研究了均匀磁场中三量子比特海森堡XX链中任意两个晶格之间的量子相变和杂质对热纠缠的影响。结果表明,当杂质参数为任意常数且不等于零时,量子相变总是发生的,外加磁场和杂质参数对量子相变有很大影响。量子相变与纠缠之间也存在着一定的联系。通过调节温度、磁场和杂质参数,任意两个晶格之间的纠缠可以表现出平台式的行为,这可以用来实现纠缠开关。
In this paper, we study the quantum phase transition and the effect of impurity on the thermal entanglement between any two lattices in three-qubit Heisenberg XX chain in a uniform magnetic field. We show that the quantum phase transition always appears when impurity parameter is an arbitrary constant and unequal to zero, the external magnetic field and impurity parameters have a great effect on it. Also, there exists a relation between the quantum phase transition and the entanglement. By modulating the temperature, magnetic field and the impurity parameters, the entanglement between any two lattices can exhibit platform-like behaviour, which can be used to realize entanglement switch.
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期刊: The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics
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