The thermal entanglement in a spin-1 Heisenberg XXZ chain

Huiying Ni; Jianxing Fang; Xiaoyan Zhou; Shuiheng Gu

doi:10.1117/12.755372

26 November 2007 The thermal entanglement in a spin-1 Heisenberg XXZ chain

Huiying Ni, Jianxing Fang, Xiaoyan Zhou, Shuiheng Gu

Proceedings Volume 6827, Quantum Optics, Optical Data Storage, and Advanced Microlithography; 682704 (2007) https://doi.org/10.1117/12.755372
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

In this paper, the entanglement in a spin-1 Heisenberg XXZ chain with uniform and nonuniform external magnetic field is investigated in the terms of the measure of entanglement called 'negativity'. The effects of the external magnetic field, the anisotropy parameter and the temperature on the negativity are discussed respectively. It can be seen that the entanglement in this spin chain for any temperature is symmetric with respect to zero magnetic field. We calculate the partially transposed density matrix and give qualitatively results at different temperatures. In order to show the results clearly, the behavior of negativity is presented for five different cases. It can be found that the temperature and the external magnetic field can effect the feature of the thermal entanglement significantly. In addition, under certain condition, the negativity may be enhanced under a nonuniform magnetic field.

Citation Download Citation

Huiying Ni, Jianxing Fang, Xiaoyan Zhou, and Shuiheng Gu "The thermal entanglement in a spin-1 Heisenberg XXZ chain", Proc. SPIE 6827, Quantum Optics, Optical Data Storage, and Advanced Microlithography, 682704 (26 November 2007); https://doi.org/10.1117/12.755372

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