Regensburg 2022 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 36: Quantum Coherence and Quantum Information Systems (joint session TT/DY)

DY 36.1: Talk

Thursday, September 8, 2022, 09:30–09:45, H22

Design of a granular aluminum Fluxonium qubit in a coplanar waveguide architecture — •Patrick Paluch, Martin Spiecker, Nicolas Gosling, Alexandru Ionita, Simon Günzler, Daria Gusenkova, Dennis Rieger, Ivan Takmakov, Francesco Valenti, Patrick Winkel, Wolfgang Wernsdorfer, and Ioan-Mihai Pop — Karlsruhe Institute of Technology

Fluxonium qubits are often embedded in rectangular waveguides which dilute the electric field and favor high coherence [1,2]. However, this configuration complicates in-situ flux gates and multi-qubit experiments. Here, we present a fluxonium qubit placed in a coplanar waveguide architecture with an integrated fast-flux coil, surrounded by a normal metal ground plane. The superinductor is made out of granular aluminum (grAl) [3] and the use of a comparably large silver ground plane potentially decreases the number of quasiparticles in the system via phonon trapping [4].

[1] Pop et al., Nature 508, 369 (2014)

[2] Somoroff et al., arXiv:2103.08578 (2021)

[3] Grünhaupt et al., Nat. Mater. 18, 816 (2019)

[4] Henriques et al., Appl. Phys. Lett. 115, 212601 (2019)