SAMOP 2023 – scientific programme
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QI: Fachverband Quanteninformation
QI 5: Superconducting Qubits and Hybrid Systems
QI 5.3: Talk
Monday, March 6, 2023, 11:45–12:00, F428
High-impedance resonators based on granular aluminum — •Mahya Khorramshahi1, Martin Spiecker1, Patrick Paluch2, Thomas Reisinger1, and Ioan Pop1 — 1Institute for Quantum Materials and Technology, Karlsruher Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany — 2Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, 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 with 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