Ultrastrong magnon-photon coupling in superconductor/antiferromagnet/superconductor heterostructures at terahertz frequenciesRemoveV. M. Gordeeva, Yanmeng Lei, Xiyin Ye, G. A. Bobkov, A. M. Bobkov, Tao Yu, and I. V. BobkovaPhys. Rev. B 113, 134418 (2026)