Physics – Quantum Physics
Scientific paper
2008-05-27
Phys. Rev. E 78, 051126 (2008)
Physics
Quantum Physics
7 pages, 3 figures
Scientific paper
10.1103/PhysRevE.78.051126
We derive a general formula of the reduced fidelity susceptibility when the reduced density matrix is $2\times2$ block-diagonal. By using this result and the continuous unitary transformations, we study finite-size scaling of the reduced fidelity susceptibility in the Lipkin-Meshkov-Glick Model. It is found that it can be used to characterize quantum phase transitions, implying that we can extract information of quantum phase transitions only from the fidelity of a subsystem, which is of practical meaning in experiments.
Ma Jian
Wang Xiaoguang
Xiong Hengna
Xu Lei
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