https://doi.org/10.1140/epjd/e2006-00087-1
Quantum phase transition of entanglement in Heisenberg spin model with quantized field
1
Institute of Theoretical Physics, Shanxi University, Taiyuan, 030006, P.R. China
2
Institute of Condensed Matter Physics, Linyi Normal University, Linyi, 276005, P.R. China
3
Department of Physics, Qufu Normal University, Qufu, 273165, P.R. China
4
Department of Physics, Shaoxing College of Arts and Sciences, Shaoxing, 312000, P.R. China
Corresponding author: a hemm@sxu.edu.cn
Received:
13
September
2005
Revised:
3
December
2005
Published online:
20
April
2006
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.
PACS: 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bells inequalities, GHZ states, etc.) / 75.10.Jm – Quantized spin models / 03.67.Lx – Quantum computation
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006
