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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.44: Poster
Monday, March 18, 2024, 15:00–18:00, Poster C
Waveguide QED with photon-photon interaction — •Adrian Paul Misselwitz1,2,3 and Peter Rabl1,2,3 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
In quantum optics and solid state systems, light-matter interactions are usually studied under the premise, that the quantized electromagnetic field is represented by a set of independent harmonic oscillator modes. In this work we go beyond this assumption and consider the coupling of real or artificial two-level atoms to photonic waveguides in the presence of strong photon-photon interactions. Specifically, we consider superconducting qubits that are coupled to 1D and 2D arrays of coupled microwave resonators, where the presence of Josephson nonlinearities gives rise to strong interactions between the propagating photons. We investigate the few-excitation spectra of this systems and show how the interplay between atom-photon and photon-photon interactions gives rise to different classes of multi-photon bound states. Finally, we discuss how the presence of photon-photon interactions changes the photon-mediated interactions between the atoms and results in unconventional dipole-dipole interactions, which are absent in linear electromagnetic environments.
Keywords: Waveguide QED; QED; Quantum Optics; Superconducting Qubits