Phys. Rev. Lett. 92, 073602 (2004) [4 pages]Entanglement and the Phase Transition in Single-Mode SuperradianceReceived 2 September 2003; published 19 February 2004 We consider the entanglement properties of the quantum phase transition in the single-mode superradiance model, involving the interaction of a boson mode and an ensemble of atoms. For an infinite size system, the atom-field entanglement diverges logarithmically with the correlation length exponent. Using a continuous variable representation, we compare this to the divergence of the entropy in conformal field theories and derive an exact expression for the scaled concurrence and the cusplike nonanalyticity of the momentum squeezing. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.073602
DOI:
10.1103/PhysRevLett.92.073602
PACS:
42.50.Fx, 03.65.Ud, 05.30.Jp, 73.43.Nq
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