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Strong light-matter coupling has been recently successfully explored in the GHz and THz [1] range with on-chip platforms. New and intriguing quantum optical phenomena have been predicted in the ultrastrong coupling regime [2], when the coupling strength Ω becomes comparable to the unperturbed frequency of the system ω. We recently proposed a new experimental platform where we couple the inter-Landau...
We demonstrate ultrastrong light-matter coupling between less than 80 electrons located in the last occupied Landau level of an high mobility 2 dimensional electron gas and a LC resonator with an extremely small effective mode volume Veff /λ3 = 4 × 10−10. The unperturbed frequency is 300 GHz and the measured normalized coupling ratio is Ω/ω = 0.35.
Enhancement and tuning of the light-matter interaction represent key aspects for fundamental studies of cavity quantum electrodynamics (QED) and for applications both in classical and quantum devices. The coupling between the cavity photons and an elementary electronic excitation is quantified by the vacuum Rabi frequency Ω and the strong light-matter coupling regime is achieved when Ω is larger than...
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