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Ground-state instabilities and entanglement in the spin-boson model

Author

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  • Liu, Ru-Fen
  • Chen, Chia-Chu

Abstract

Ground-state instabilities of the spin-boson model is studied in this work. The existence of sequential ground-state instabilities is shown analytically for arbitrary detuning in the two-spin system. In this model, extra discontinuities of concurrence (entanglement measure) are found in the finite system, which do not appear in the on-resonant model. The above results remain intact by including extra boson modes. Moreover, by including extra modes, it is found that ground-state entanglement can be obtained and enhanced even in the weak coupling regime.

Suggested Citation

  • Liu, Ru-Fen & Chen, Chia-Chu, 2007. "Ground-state instabilities and entanglement in the spin-boson model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 374(2), pages 631-645.
    • Handle: RePEc:eee:phsmap:v:374:y:2007:i:2:p:631-645
    DOI: 10.1016/j.physa.2006.08.063
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