SKM 2023 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 39: Superconducting Electronics

TT 39.3: Talk

Wednesday, March 29, 2023, 15:45–16:00, HSZ 304

High-impedance resonators based on granular aluminum — •Mahya Khorramshahi, Martin Spiecker, Patrick Paluch, Nicolas Zapata, Ritika Dhundhwal, Ioan M. Pop, and Thomas Reisinger — Karlsruhe Institute of Technology, Germany

Superconductors with characteristic impedance larger than the resistance quantum are a valuable resource in superconducting circuits. They enable the design of protected qubits such as Fluxoniums or 0-pi qubits and can improve the coupling to small-dipole-moment objects, which may be useful for interfacing to spin-qubits, donor spins, etc. Here we present compact resonators in the lower GHz regime with a high characteristic impedance given by a high-kinetic-inductance material, namely granular aluminum, with spurious modes above 10GHz. We fabricated the resonators with an electron-beam lithography lift-off process, and we coupled them using a 50 Ohm coplanar waveguide architecture. Measurements performed in a dilution cryostat reveal that the resonators maintain high-quality factors in the single photon regime, a valuable resource for future quantum hardware implementations.