Quantum phase transition of nonlinear light in the finite size Dicke Hamiltonian

Details Quantum phase transition of nonlinear light in the finite size Dicke Hamiltonian Quantum phase transition of nonlinear light in the finite size Dicke Hamiltonian

2010-05-21

arxiv.org/abs/1005.3884v2

JOSA B, Vol. 27, Issue 11, pp. 2443-2450 (2010)

Physics

Quantum Physics

17 pages, 2 figures, 1 table

Scientific paper

10.1364/JOSAB.27.002443

We study the quantum phase transition of a N two-level atomic ensemble interacting with an optical degenerate parametric process, which can be described by the finite size Dicke Hamiltonian plus counter-rotating and quadratic field terms. Analytical closed forms of the critical coupling value and their corresponding separable ground states are derived in the weak and strong coupling regimes. The existence of bipartite entanglement between the two-level-system ensemble and photon field as well as between ensemble components for moderate coupling is shown through numerical analysis. Given a finite size, our results also indicate the co-existence of squeezed fields and squeezed atomic ensembles.

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