Abstract
Artificial atoms (AAs) offer the possibility to design physical systems implementing new regimes of ultrastrong coupling (USC) between radiation and matter [C. Ciuti et al., Phys. Rev. B 72, 115303 (2005)], where previously unexplored non-perturbative physics emerges. While experiments so far provided only spectroscopic evidence of USC, we propose the dynamical detection of virtual photon pairs in the dressed eigenstates, which is a smoking gun of the very existence of USC in nature. We show how to coherently amplify this channel to reach 100% efficiency by operating advanced control similar to stimulated Raman adiabatic passage (STIRAP) [N.V. Vitanov et al., Rev. Mod. Phys. 89, 015006 (2017)].
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Ridolfo, A., Falci, G., Pellegrino, F.M.D. et al. Photon pair production by STIRAP in ultrastrongly coupled matter-radiation systems. Eur. Phys. J. Spec. Top. 227, 2183–2188 (2019). https://doi.org/10.1140/epjst/e2018-800076-1
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DOI: https://doi.org/10.1140/epjst/e2018-800076-1