Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.38: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Microwave environment design for compact arrays of granular aluminum fluxonium qubits — •Patrick Paluch1,2, Martin Spiecker2, Daria Gusenkova2, Ivan Takmakov2, Francesco Valenti2, Patrick Winkel2, Dennis Rieger2, and Ioan Pop1,21Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany — 2Physikalisches Institut, Karlsruhe Institute of Technology, 76137 Karlsruhe, Germany

Fluxonium qubits employing the high kinetic inductance of granular aluminum (grAl) have recently been implemented, demonstrating state-of-the-art coherence time [1]. In superconducting qubit design, the use of 3D waveguides is generally advantageous in reducing dielectric losses; however, it can limit the availability of in-situ magnetic flux lines. Moreover, given the localized nature of the fluxonium qubit mode, with the junction capacitance dominating, the advantages of 3D waveguides can be debated. Here we present a fast-flux tunable grAl fluxonium design in a coplanar waveguide geometry, surrounded by a normal metal ground plane, potentially decreasing the number of quasiparticles in the system [2] and avoiding flux trapping.
[1] Grünhaupt and Spiecker et al., Nat. Mater. 18, 816-819 (2019)
[2] Henriques and Valenti et al., Appl. Phys. Lett. 115, 212601 (2019)

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