Fisher information, Rényi entropy power and quantum phase transition in the Dicke model

Á. Nagy and E. Romera

Physica A: Statistical Mechanics and its Applications, 2012, vol. 391, issue 13, 3650-3655

Abstract: Fisher information, Rényi entropy power and Fisher–Rényi information product are presented for the Dicke model. There is a quantum phase transition in this quantum optical model. It is pointed out that there is an abrupt change in the Fisher information, Rényi entropy power, the Fisher, Shannon and Rényi lengths at the transition point. It is found that these quantities diverge as the characteristic length: |λc−λ|−1/4 around the critical value of the coupling strength λc for any value of the parameter β.

Keywords: Quantum phase transition; Dicke model; Fisher information; Fisher-Rényi information product (search for similar items in EconPapers)
Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:391:y:2012:i:13:p:3650-3655

DOI: 10.1016/j.physa.2012.02.024

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