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Using extended coherent states, an analytical exact study has been carriedout for the quantum Rabi model (QRM) with two arbitrary qubits in a veryconcise way. The $G$-functions with $2 \times 2$ determinants are generallyderived. For the same coupling constants, the simplest $G$-function, resemblingthat in the one-qubit QRM, can be obtained. Zeros of the $G$-function yield thewhole regular spectrum. The exceptional eigenvalues, which do not belong to thezeros of the $G$ function, are obtained in the closed form. The Dark states inthe case of the same coupling can be detected clearly in a continued-fractiontechnique. The present concise solution is conceptually clear and practicallyfeasible to the general two-qubit QRM and therefore has many applications.

Concise analytic solutions to the quantum Rabi model with two arbitrary qubits