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Quantum phase transition and entanglement in Heisenberg XX spin chain with impurity |
| Chen Shi-Rong(陈士荣), Xia Yun-Jie(夏云杰)†, and Man Zhong-Xiao(满忠晓) |
| Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Department of Physics, Qufu Normal University, Qufu 273165, China |
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Abstract 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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Received: 09 September 2009
Revised: 12 November 2009
Accepted manuscript online:
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PACS:
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73.43.Nq
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(Quantum phase transitions)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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75.10.Pq
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(Spin chain models)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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75.30.Hx
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(Magnetic impurity interactions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No.~10774088), the Key Program of the National Natural Science Foundation of China (Grant No.~10534030). |
Cite this article:
Chen Shi-Rong(陈士荣), Xia Yun-Jie(夏云杰), and Man Zhong-Xiao(满忠晓) Quantum phase transition and entanglement in Heisenberg XX spin chain with impurity 2010 Chin. Phys. B 19 050304
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