Ground State Instabilities and Entanglement in the Detuned Dicke Model

Details Ground State Instabilities and Entanglement in the Detuned Dicke Model Ground State Instabilities and Entanglement in the Detuned Dicke Model

2005-10-11

arxiv.org/abs/quant-ph/0510071v3

Physica A, 374, p631-645 (2007)

Physics

Quantum Physics

11 pages, 3 figures.This work has been accepted by Physica A with the title"Ground State Instabilities and Entanglement in the

Scientific paper

10.1016/j.physa.2006.08.063

Ground state instabilities of the spin-boson model is studied in this work. The existence of sequential ground state instabilities is shown analytically for arbitrary detuning in the two-spin system. In this model, extra discontinuities of concurrence(entanglement measure) are found in the finite system, which do not appear in the on-resonant model. The above results remain intact by including extra boson modes. Moreover, by including extra modes, it is found that ground state entanglement can be obtained and enhanced even in the weak coupling regime.

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