@misc{giannelli2023detecting,
  title={Detecting virtual phothons in ultrastrongly coupled superconducting quantum circuits},
  author={L. Giannelli and E. Paladino and M. Grajcar and G. S. Paraoanu and G. Falci},
  year={2023},
  eprint={2302.10973},
  archivePrefix={arXiv},
  primaryClass={quant-ph},
  url={https://arxiv.org/abs/2302.10973}
}