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DY: Fachverband Dynamik und Statistische Physik
DY 12: Quantum Coherence and Quantum Information Systems (joint session TT/DY)
DY 12.3: Vortrag
Dienstag, 18. März 2025, 10:15–10:30, H31
Impurity models in waveguide QED — •Adrian Paul Misselwitz1,2,3, Jacquelin Luneau1,2,3, 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 this talk I will discuss photonic impurity models, which emerge from the coupling of two-level atoms to a 1D photonic waveguide in the presence of strong photon-photon interactions. Such models appear, for example, in the context of superconducting microwave circuits, where Josephson junctions give rise to strong Kerr-nonlinearities at the few-photon level. In this case, the resulting competition between photon-photon repulsion and the attractive atom-photon interaction leads to the formation of localized bound states with a well-defined photon number and, under certain conditions, the build-up of long-range, algebraically decaying correlations between the impurity sites. I will show how these strongly-correlated phases of light and matter can be simulated efficiently with the help of large-scale tensor network simulations and discuss a possible explanation of the observed long-range correlations in terms of a simpler, effective Bose-Hubbard model.
Keywords: Waveguide QED; Quantum Optics; Superconducting Qubits; Impurity Model