Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8202081 | Annals of Physics | 2015 | 9 Pages |
Abstract
Using extended coherent states, an analytical exact study has been carried out for the quantum Rabi model (QRM) with two arbitrary qubits in a very concise way. The G-functions with 2Ã2 determinants are generally derived. For the same coupling constants, the simplest G-function, resembling that in the one-qubit QRM, can be obtained. Zeros of the G-function yield the whole regular spectrum. The exceptional eigenvalues, which do not belong to the zeros of the G function, are obtained in the closed form. The Dark states in the case of the same coupling can be detected clearly in a continued-fraction technique. The present concise solution is conceptually clear and practically feasible to the general two-qubit QRM and therefore has many applications.
Keywords
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Physical Sciences and Engineering
Physics and Astronomy
Physics and Astronomy (General)
Authors
Liwei Duan, Shu He, Qing-Hu Chen,