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TT: Fachverband Tiefe Temperaturen

TT 37: Superconducting Electronics: SQUIDs, Qubits, Circuit QED

TT 37.8: Vortrag

Freitag, 9. September 2022, 11:15–11:30, H22

Waveguide quantum electrodynamics in high impedance networks — •Miriam Resch¹, Ciprian Padurariu¹, Björn Kubala^{1, 2}, and Joachim Ankerhold¹ — ¹ICQ and IQST, Ulm University, Ulm, Germany — ²Institute of Quantum Technologies, German Aerospace Center (DLR), Ulm, 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 sub-units of quantum information devices, namely 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 typically couples to many waveguide modes simultaneously so that many common approximation schemes break down. While strong-coupling effects in closed systems have been widely investigated, showing, e.g. the breakdown of the Jaynes-Cummings model, our project aims at describing strongly coupled open quantum systems and photon emission. With experimental collaborators, we ultimately want to identify strong-coupling signatures in observables of the emitted radiation. Here, we present as preliminary steps towards the description of more complicated systems first investigations based on an ansatz, where the wave function of the complete system (unit + waveguide) is described by superposition of coherent states as proposed in [1], which allows to solve the system dynamics in a numerically efficient way.

[1] Nicolas Gheeraert et al., New J. Phys. 19 (2017) 023036