Recent advancements in superconducting circuits have enabled the experimental study of collective behavior of precisely controlled intermediate-scale ensembles of qubits. In this work, we demonstrate an atomic frequency comb formed by individual artificial atoms strongly coupled to a single resonator mode. We observe periodic microwave pulses that originate from a single coherent excitation dynamically interacting with the multi-qubit ensemble. We show that this revival dynamics emerges as a consequence of the constructive and periodic rephasing of the five superconducting qubits forming the vacuum Rabi split comb. In the future, similar devices could be used as a memory with in-situ tunable storage time or as an on-chip periodic pulse generator with non-classical photon statistics.
@article{arxiv.2310.04200,
title = {Observation of collapse and revival in a superconducting atomic frequency comb},
author = {E. S. Redchenko and M. Zens and M. Zemlicka and M. Peruzzo and F. Hassani and H. S. Dhar and D. O. Krimer and S. Rotter and J. M. Fink},
journal= {arXiv preprint arXiv:2310.04200},
year = {2025}
}