SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 39: Superconducting Electronics
TT 39.2: Vortrag
Mittwoch, 29. März 2023, 15:30–15:45, HSZ 304
Waveguide quantum electrodynamics in high impedance networks — •Miriam Resch1, Ciprian Padurariu1, Björn Kubala1,2, Frank Grossmann3, and Joachim Ankerhold1 — 1ICQ and IQST, Ulm University, Ulm, Germany — 2Institute of Quantum Technologies, German Aerospace Center (DLR), Ulm, Germany — 3Institut für Theoretische Physik, Technische Universität Dresden, Dresden, Germany
The emerging field of high impedance quantum circuits aims to exploit the extraordinary properties of high kinetic inductance materials, such as granular superconductors. The low propagation speed of electromagnetic excitations in such devices enables to strongly couple various types of qubits or resonators and waveguides. Theoretical description of such strongly coupled systems is challenging as the localized modes of the sub-unit couple to many waveguide modes simultaneously so that many common approximation schemes break down. Furthermore for a more realistic description of the system, Kerr nonlinearities are included in the model of the granular superconductor. To tackle this challenging regime in a numerically efficient way, we use the multi Davydov-Ansatz [1], where the wave function of the full system is described by a superposition of coherent states. As a first step we investigate how Kerr nonlinearities modify properties of qubit decay or readout, with the ultimate goal of identifying strong-coupling signatures in those observables, which are accessible to our experimental collaborators.
[1] M. Werther and F. Großmann, Phys. Rev. B 101, 174315 (2020).