Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Superconductivity: Qubits 2

TT 58.7: Vortrag

Donnerstag, 4. April 2019, 16:30–16:45, Theater

Rabi-oscillations in disordered superconducting nanowire qubit — •Yannick Schön¹, Jan Nicolas Voss¹, Micha Wildermuth¹, Andre Schneider¹, Martin Weides¹, Hannes Rotzinger¹, and Alexey V. Ustinov^1,2 — ¹Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — ²Russian Quantum Center, National University of Science and Technology MISIS, Moscow 119049, Russia

At feature sizes of nanometer scale, superconducting wires made from a material with high normal state resistance show a pronounced nonlinear microwave response.

Our material of choice, granular aluminum oxide, is a new material for superconducting quantum circuits which features not only a very high kinetic inductance but also microwave resonators with high quality factors. Microscopically, it can be described as a disordered network of nano-scale aluminum grains, coupled via the Josephson effect.

We demonstrate a new type of superconducting quantum circuit, using capacitively shunted granular aluminum nanowires embedded as nonlinear circuit element. We present circuit characterization in microwave response measurements featuring Rabi-oscillations and measure state life times in the µs range.