Exploring Multilevel Spin Models in a Strontium Cavity QED System

Cavity quantum electrodynamics (cavity QED) has emerged as a promising platform for quantum simulation of many-body physics. Here we utilize the full F=9/2 nuclear spin ground states in 87-Sr atoms as a synthetic dimension and realize correlated along this dimension. By isolating the system to a two-level system, we can also observe the mean-field dynamics of pair-creation induced by the same type of cavity-mediated interactions. We also present a technique for single shot readout of the populations of each nuclear spin state, which is compatible with quantum nondemolition (QND) measurements. On a separate front, we also report the realization of the cooperative resonance fluorescence (CRF) model and observe the predicted continuous dissipation-induced superradiant transition [1,2].

[1] H. J. Carmichael, Journal of Physics B: Atomic and Molecular Physics 13, 3551 (1980)

[2] Eric Yilun Song et al. , A dissipation-induced superradiant transition in a strontium cavity-QED system. Sci. Adv.11, eadu5799(2025). DOI:10.1126/sciadv.adu5799