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Many-body Reduced Fidelity Susceptibility in the Lipkin-Meshcov-Glick Model
Lei Xu,Jian Ma,Xiaoguang Wang *
Zhejiang Institute of Modern Physics, Department of Physics, Zhejiang University, Hangzhou
*Correspondence author
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Funding: 教育部博士点基金,国家自然科学基金(No.20050335087,10405019)
Opened online: 9 January 2009
Accepted by: none
Citation: Lei Xu,Jian Ma,Xiaoguang Wang.Many-body Reduced Fidelity Susceptibility in the Lipkin-Meshcov-Glick Model[OL]. [ 9 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27585
 
 
We analyze the critical properties of Lipkin-Meshcov-Glick model in terms of fidelity susceptibility through -body reduced density matrix which we regard as reduced fidelity susceptibility. By computing the -body reduced density matrix, we obtain numerically the singular properties of reduced fidelity susceptibility in the vicinity of quantum transition point as well as its scaling behavior. We also make comparative study of ground-state and reduced ground-state susceptibility. We show that the -body reduced fidelity susceptibility can also be used to characterize QPTs
Keywords:Lipkin-Meshcov-Glick Model; Fidelity; Reduced Fidelity; Fidelity Susceptibility
 
 
 

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