Abstract.
In this paper, we investigate the entanglement of a two-spin system with Heisenberg exchange interaction in a quantized field. The pairwise entanglement between bipartite subsystems is obtained. It is shown that the entanglement exhibits a quantum phase transition due to the variation of exchang coupling. Phase diagrams are obtained explicitly. The analogy of the quantum phase transition compared to the case under a classical field are addressed.
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He, MM., Xu, CT., Chen, G. et al. Quantum phase transition of entanglement in Heisenberg spin model with quantized field. Eur. Phys. J. D 39, 313–320 (2006). https://doi.org/10.1140/epjd/e2006-00087-1
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DOI: https://doi.org/10.1140/epjd/e2006-00087-1