Qing-Hu Chen, Chen Wang, Ke-Lin Wang
The quantum Rabi model can be solved exactly by the Bargmann transformation from real coordinate to complex variable recently [Phys. Rev. Lett. 107, 100401 (2011)]. Within the extended coherent states, we recover this solution in an alternative simpler and perhaps more physical way. The extended coherent states are essentially Fock states in the space of the corresponding Bogoliubov operators. The present approach could be extended to various spin-boson systems with multi-level, even multi-photon.
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http://arxiv.org/abs/1204.3668
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