Superconducting junction arrays constitute a versatile and tunable platform to engineer model Hamiltonians that are relevant for quantum many-body systems, dissipative quantummechanics, and non-linear quantum optics. We investigate the detailed AC spectroscopy of the boundary sine-Gordon (BSG) model for a circuit designed with a large impedance value below the resistance quantum. This regime triggers large fluctuations of the superconducting phase variable, leading to two major and related physical effects: a giant renormalization of the Josephson energy at the boundary site, and a broadband inelastic scattering of external photons induced by the dynamics at the boundary.
We also give the first direct experimental detection of three-photon down-conversion in the BSG model. We finally discuss critically the advantages and limitations of superconducting circuits for the exploration of quantum many-body phenomena.
De Hepeng Yao
De Serge Florens
De Antoine Browaeys
De Davide Rossini
De Adam Rançon
De Laurent Sanchez-Palencia
De Angela Riva
De Jacqueline Bloch
De Irenée Frérot
De Monika Aidelsburger
De Tommaso Roscilde
De Artem Volosniev
De Roberta Citro
De Alessandro Romito
De Andrea Trombettoni
De Stefania De Palo
De Silvia Musolino
De Jacopo De Nardis
De Joseph Vovrosh
De Matteo Rizzi
De Lucila Peralta Gavensky
