Quantum Simulation of Non‐Perturbative Cavity QED with Trapped Ions

Abstract

The simulation of non-perturbative cavity-QED effects is discussed using systems of trapped ions. Specifically, the implementation of extended Dicke models with both collective dipole-field and direct dipole-dipole interactions is addressed, which represent a minimal set of models for describing light-matter interactions in the ultrastrong and deep-strong coupling regime. It is shown that this approach can be used in state-of-the-art trapped ion setups to investigate excitation spectra or the transition between sub-and superradiant ground states, which are currently not accessible in any other physical system. The analysis also reveals the intrinsic difficulty of accessing this non-perturbative regime with larger numbers of dipoles, which makes the simulation of many-dipole cavity QED a particularly challenging test case for future quantum simulation platforms.

Effects of Counter‐Rotating Couplings on the Dynamics of a Λ System: Long‐Lived Coherence Oscillations

“…Strong and ultrastrong light-matter coupling in the context of artificial atoms has attracted much attention in recent years, which allows the study of quantum optics in a regime beyond the widely used rotating-wave approximation (RWA) and has potential applications in quantum technology as well as in chemistry. [1][2][3][4][5][6] Literature reports several experimental realizations of the quantum Rabi model, which describes the interaction between a two-level DOI: 10.1002/qute. 202300263 system and a single-mode resonator, in the ultrastrong or deep strong coupling regimes where the coupling constant is comparable with the system frequency.…”