Today, most superconducting microwave resonators are made of ordinary, straight wires. A conventional single-wire resonator has an impedance bounded by the impedance of free space (377 Ω). In contrast, the resonators that we are developing reach impedances in the order of 104 Ω by harnessing the mutual-inductance between concentric loops in a spiral pattern. Eventually, such low-loss superinductors can be used for new qubit designs that are robust against noise and for hybrid quantum architectures coupling superonducting circuits to spin qubits.
From Fink-group, ISTA Austria
Surpassing the Resistance Quantum with a Geometric Superinductor
Phys. Rev. Applied 14, 044044 (2020)| Arxiv:2007.01644