主讲：Daniel Braak 博士
专家简介： Daniel Braak 博士，Rabi模型严格解的发现者
报告摘要：The quantum Rabi model is integrable, because it possesses a discrete parity symmetry which allows to eliminate the qubit degree of freedom. Level degeneracies occur thus only between states of different parity. They correspond to quasi-exact solutions of the model. This so-called exceptional spectrum has peculiar features if the model contains more than one qubit. For a generalization with broken symmetry, the quasi-exact solutions are non-degenerate except for special values of the symmetry-breaking parameter, indicating a hidden symmetry in this model associated with Dirac cones in the spectral graph. I shall discuss these special features following a general introduction to the subject.