Entanglement in spin-1/2 dimerized Heisenberg systems
Zhe Sun, XiaoGuang Wang, AnZi Hu, You-Quan Li
Abstract
We study entanglement in dimerized Heisenberg systems. In particular, we give exact results of ground-state pairwise entanglement for the four-qubit model by identifying a Z2 symmetry. Although the entanglements cannot identify the critical point of the system, the mean entanglement of nearest-neighbor qubits really does, namely, it reaches a maximum at the critical point.
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