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Thermal entanglement in two qutrits system

  • Quantum Optics and Quantum Information
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Abstract.

The thermal entanglement in a two-qutrit system with two spins coupled by exchange interaction is investigated in terms of the measure of entanglement called “negativity”. It is found that the thermal entanglement is present and evolvements symmetrically between both ferromagnetic and antiferromagnetic exchange couplings with the temperature. Moreover the critical temperature at which the negativity vanishes increases with the exchange coupling constant J. From the temperature and magnetic field dependences we demonstrate that the temperature and the magnetic field can affect the feature of the thermal entanglement significantly.

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Authors and Affiliations

  1. State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083, P.R. China

    G.-F. Zhang

  2. Institute of Theoretical Physics, Shanxi University, Taiyuan, 030006, P.R. China

    J.-Q. Liang

  3. Shenfu Dongsheng Coal Limited Company Shenhua Group, Halagou Coal Mine Daliuta Shenmu, Shanxi, 719315, P.R. China

    G.-E. Zhang

  4. State Key Laboratory of Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100080, P.R. China

    Q.-W. Yan

Authors
  1. G.-F. Zhang
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  2. J.-Q. Liang
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  3. G.-E. Zhang
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  4. Q.-W. Yan
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Correspondence to G.-F. Zhang.

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Zhang, GF., Liang, JQ., Zhang, GE. et al. Thermal entanglement in two qutrits system. Eur. Phys. J. D 32, 409–412 (2005). https://doi.org/10.1140/epjd/e2004-00194-y

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  • DOI: https://doi.org/10.1140/epjd/e2004-00194-y

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