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Decoherence and entanglement in coherent quantum tunneling of magnetization with dissipation

  • Mesoscopic Physics
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Abstract.

We study the coherent quantum tunneling of magnetization, for example, in a biaxial molecular magnet with dissipation of the environment which results in the suppression of the tunneling and therefore the decoherence of superposition of macroscopic quantum states in terms of the general spin-boson model. The degree of entanglement between the magnet and the environment is evaluated explicitly with the help of reduced density matrix. We show an interesting relation that the degree of entanglement approaches maximum value when the coherent tunneling is suppressed completely.

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Authors and Affiliations

  1. Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan, 030006, Shanxi, P.R. China

    Yi-Hang Nie, Jun-Jun Liang & J.-Q. Liang

  2. Department of Physics, Yanbei Normal Institute, Datong, 037000, Shanxi, P.R. China

    Yi-Hang Nie & Yun-Long Shi

Authors
  1. Yi-Hang Nie
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  2. Jun-Jun Liang
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  3. Yun-Long Shi
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  4. J.-Q. Liang
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Correspondence to Yi-Hang Nie.

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Nie, YH., Liang, JJ., Shi, YL. et al. Decoherence and entanglement in coherent quantum tunneling of magnetization with dissipation. Eur. Phys. J. B 43, 125–129 (2005). https://doi.org/10.1140/epjb/e2005-00035-5

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  • DOI: https://doi.org/10.1140/epjb/e2005-00035-5

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