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Effects of Anisotropy on Pair-wise Entanglement of a Four-Qubit Heisenberg |
| CAO Min1;ZHU Shi-Qun2 |
| 1School of Science, Nantong University, Nantong 226007
2School of Physical Science and Technology, Suzhou University, Suzhou 215006 |
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| Cite this article: |
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CAO Min, ZHU Shi-Qun 2006 Chin. Phys. Lett. 23 2888-2891 |
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Abstract The pair-wise thermal entanglement in a four-qubit Heisenberg XXZ chain is investigated to study the role of anisotropy when an external magnetic field is included. It is found that pair-wise entanglement is absent between nearest- and next-nearest neighbouring qubits with anisotropic parameter Δ ≤ -1. For two nearest-neighbouring qubits, increasing the parameter can not only induce the entanglement, but also extend the entanglement region in terms of magnetic field B and temperature T. For two next-nearest-neighbouring qubits, increasing anisotropic parameter can shift the location of the entanglement and control the extent of the entanglement in terms of magnetic field at a finite temperature.
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| Keywords:
03.65.Ud
03.67.Mn
75.10.Jm
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Published: 01 November 2006
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| PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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