Realization of pseudo-Hermiticity is proposed in a cavity magnonics system consisting of two magnon modes coupled to a microwave cavity. By varying the coupling strengths between the magnon modes and the cavity mode, the authors show the existence of a third-order exceptional point in the parameter space, in addition to the usual second-order exceptional point known for a system with parity-time symmetry. This work provides an experimentally feasible scheme to realize pseudo-Hermiticity and a third-order exceptional point in a hybrid quantum system.
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Zhang et al. (2019) studied this question.
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