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As the counterpart of PT symmetry, abundant phenomena and potentialapplications of anti-PT symmetry have been predicted or demonstratedtheoretically. However, experimental realization of the coupling required inthe anti-PT symmetry is difficult. Here, by coupling two YIG spheres to amicrowave cavity, the large cavity dissipation rate makes the magnons coupleddissipatively with each other, thereby obeying a two-dimensional anti-PTHamiltonian. In terms of the magnon-readout method, a new method adopted here,we demonstrate the validity of our method in constructing an anti-PT system andpresent the counterintuitive level attraction process. Our work provides a newplatform to explore the anti-PT symmetry properties and paves the way to studymulti-magnoncavity-polariton systems.

Observation of anti-PT symmetry phase transition in the magnon-cavity-magnon coupled system