Quantum nonlocality of Heisenberg XX model with Site-dependent Coupling Strength
Chunfeng Wu, Jing-Ling Chen, D. M. Tong, L. C. Kwek, C. H. Oh
Abstract
We show that the generalized Bell inequality is violated in the extended Heisenberg model when the temperature is below a threshold value. The threshold temperature values are obtained by constructing exact solutions of the model using the temperature-dependent correlation functions. The effect due to the presence of external magnetic field is also illustrated.
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