Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: Superconducting Electronics: SQUIDs, Qubits, Circuit QED
TT 37.13: Vortrag
Freitag, 9. September 2022, 12:45–13:00, H22
Green's function approach to modelling finite size systems for applications in superconducting waveguide QED — •Pradeepkumar Nandakumar1, Andres Rosario Hamann1,2, Rohit Navarathna1, Maximilian Zanner3, Mikhail Pletyukhov4, and Arkady Fedorov1 — 1ARC Centre of Excellence for Engineered Quantum Systems, School of Mathematics and Physics, The University of Queensland, Saint Lucia, Queensland 4072, Australia — 2Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland — 3Center for Quantum Physics, and Institute for Experimental Physics, University of Innsbruck, A-6020 Innsbruck, Austria — 4Institute for Theory of Statistical Physics, RWTH Aachen University, 52056 Aachen, Germany
In superconducting waveguide QED, artificial atoms are coupled to a 1D radiation channel that consists of continuum of electromagnetic modes. Waveguides are often modelled as infinite in size with open boundary conditions for the ease of understanding. However, while modelling waveguides employed in experiments, one should consider both the finite size of the waveguide as well as its coupling to measurement apparatus. To this end, we have developed a general method to realistically model any waveguide QED system using the Green's function methods that is often employed in studying electronic transport. We apply our formalism and experimentally study the formation of Atom-Photon Bound States (APBS) using two transmon qubits coupled to a 3D rectangular waveguide. Our results identify the prospects for using APBS for studying bosonic impurity models.