Ultrastrong coupling with propagating photons

DIPC Seminars

Juan García-Ripoll, IFF, CSIC, Madrid
Donostia International Physics Center
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Ultrastrong coupling with propagating photons In the ultrastrong coupling regime, light and matter interact at a rate that approaches the speed with which the matter and light evolve. In this challenging regime, light entangles and dresses the states of matter, complicating a traditional quantum optics description based on the Jaynes- Cummings model, rotating-wave approximation and similar techniques. In this talk I will summarize our work on the USC regime with propagating light, introducing the underlying spin-boson model, the numerical and analytical methods we use [1] and a experimental collaboration to reproduce this regime with superconducting circuits [2]. [1] Shi, T., Chang, Y. and García-Ripoll, J.J., 2018. Ultrastrong coupling few-photon scattering theory., Physical review letters, 120/(15), p.153602. [2] Forn-Díaz, P., García-Ripoll, J.J., Peropadre, B., Orgiazzi, J.L., Yurtalan, M.A., Belyansky, R., Wilson, C.M. and Lupascu, A., 2017. Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime. Nature Physics, 13,(1), p.39. Host: Geza Giedke