Abstract:In this paper, some physical observables such as the energy spectra and time dynamics as well as the photon statistics of the two-photon quantum Rabi model in the ultrastrong coupling regime are numerically explored. The main aim of this work is to show the effect of the number of cavity fock states N on the spectral properties, particularly the special feature spectral collapse at critical coupling gc=ꞷc/2. We have shown that for a large number of cavity fock states the numberof discrete energy levels decreas… Show more
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