A multimode cavity QED Ising spin glassB. P. Marsh, D. Atri Schuller, Y. Ji, H. S. Hunt, G. Z. Socolof, D. P. Bowman, J. Keeling, and B. L. LevPhysical Review Letters 135, 160403 (2025)arXiv:2505.22658PRL Collection of the Year, 2025.Selected as an Editors' Suggestion.Cover of Physical Review Letters.