PMID: 19113114Dec 31, 2008Paper

Reduced fidelity susceptibility and its finite-size scaling behaviors in the Lipkin-Meshkov-Glick model

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Jian MaXiaoguang Wang

Abstract

We derive a general formula for the reduced fidelity susceptibility when the reduced density matrix is 2x2 block diagonal. By using this result and a continuous unitary transformation, we study finite-size scaling of the reduced fidelity susceptibility in the Lipkin-Meshkov-Glick model. It is found that it can well characterize quantum phase transitions, that is, we can extract information about quantum phase transitions from only the fidelity of a subsystem, which is of practical use in experiments.

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Citations

Feb 20, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·V M L Durga Prasad GoliDiptiman Sen
Oct 2, 2009·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Jian MaShi-Jian Gu

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