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QI: Fachverband Quanteninformation

QI 26: Superconducting Electronics: Qubits II (joint session TT/QI)

QI 26.3: Vortrag

Donnerstag, 21. März 2024, 15:30–15:45, H 2053

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

High-impedance resonators in superconducting quantum circuits are important in the advancement of quantum computing technologies. In particular, impedances surpassing the resistance quantum can be realized, enabling the development of protected qubits and strong coupling to small-dipole-moment systems with exciting prospects for interfacing to spin qubits or donor spins. Utilizing granular aluminum (GrAl), we have developed compact resonators operating in the few GHz regime and characteristic impedances as high as 80 kOhm. We characterized the resonators, with GrAl resistivity increasingly close to the superconducting to insulating transition, and report on single photon quality factors, non-linearity, and noise-spectral density.