Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 43: Superconducting Electronics: Qubits

TT 43.5: Talk

Wednesday, March 11, 2026, 10:30–10:45, CHE/0089

fluxonium qubits inductively coupled to granular aluminum based readout resonators — •li-wei chang, asen Lyubenov georgiev, fabian kaap, christoph kissling, victor gaydamachenko, sergey lotkhov, mark bieler, and lukas grünhaupt — Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

The fluxonium qubit is a specific type of superconducting qubit, which has garnered significant interest due to its coherence time in the milli-second range, high gate fidelities on the order of 99.9%, and a large anharmonicity up to several GHz. Recent years have also seen a surge in material studies related to this type of qubit, with a particular focus on high kinetic inductance materials such as granular aluminum (grAl). Three basic components form a fluxonium qubit: a Josephson junction, a capacitor, and a so-called superinductor with an impedance larger than the resistance quantum R_Q = h/4e². To enable dispersive readout, we employ a high-quality granular aluminum based readout resonator which is inductively coupled to the qubit through a shared inductor. Here, we present our methodology of qubit design, fabrication process and first experimental results.

Keywords: Qubit; Fabrication; Fluxonium