Scaling behavior of the quantum fisher information in the Dicke model

Yu-Yu Zhang

Published 2015-03-13Version 1

Quantum Fisher information to the X states of the collective atom ensemble and the scaled quantum fisher information of the atomic subsystem are evaluated analytically in the Dicke Hamiltonian. Critical behavior of the two kinds of Fisher information are in accordant with the analytical results in the thermodynamic limit. Finite-size scaling is analyzed with the large accessible system size due to the effective technique proposed previously. Scaling exponents of the quantum Fisher information are found.