Engineering the electromagnetic environment of a quantum emitter gives rise to a plethora of exotic light-matter interactions. In particular, photonic lattices can seed long-lived atom-photon bound states inside photonic band gaps. Here we report on the concept and implementation of a novel microwave architecture consisting of an array of compact, high-impedance superconducting resonators forming a 1 GHz-wide pass band, in which we have embedded two frequency-tuneable artificial atoms. We study the atom-field interaction and access previously unexplored coupling regimes, in both the single- and double-excitation subspace. In addition, we demonstrate coherent interactions between two atom-photon bound states, in both resonant and dispersive regimes, that are suitable for the implementation of SWAP and CZ two-qubit gates. The presented architecture holds promise for quantum simulation with tuneable-range interactions and photon transport experiments in nonlinear regime.
@article{arxiv.2107.06852,
title = {Extensible quantum simulation architecture based on atom-photon bound states in an array of high-impedance resonators},
author = {Marco Scigliuzzo and Giuseppe Calajò and Francesco Ciccarello and Daniel Perez Lozano and Andreas Bengtsson and Pasquale Scarlino and Andreas Wallraff and Darrick Chang and Per Delsing and Simone Gasparinetti},
journal= {arXiv preprint arXiv:2107.06852},
year = {2022}
}