Quantum correlations in the collective spin systems

Details Quantum correlations in the collective spin systems Quantum correlations in the collective spin systems

2012-02-20

arxiv.org/abs/1202.4324v1

Physics

Quantum Physics

8 pages, 4 figures

Scientific paper

Quantum and classical pairwise correlations in two typical collective spin systems, i.e. the Dicke model and the Lipkin-Meshkov-Glick model are discussed. In the thermodynamical limit, analytical expressions of these correlations are derived. Within the effective technique proposed previously, theses correlations for finite size system can be also obtained numerically up to very large size. The scaling behavior for the quantum discord and its first derivative are analyzed. The comparison of the quantum discord and the concurrence are performed and essentially different behaviors are observed.

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