In superconducting circuits, superinductors are employed to suppress charge fluctuations and increase zero-point voltage, enabling features for hardware-protected qubits, metrological standards, and strongly coupled hybrid devices. Conventionally these devices are based on kinetic inductance, and can suffer from nonlinearity, additional complexity due to multiterminal structure, and the limited control and reliability of bottom-up fabrication. Making use of miniaturization and substrate engineering, the authors realize a geometrically defined, single-wavefunction superinductor—a high-performance, innovative circuit element that promises to expand the scope of quantum circuitry.

Surpassing the resistance quantum with a geometric superinductor
M. Peruzzo*, A. Trioni*, F. Hassani, M. Zemlicka, J. M. Fink
Phys. Rev. Applied 14, 044055 (2020)

News coverage: Geometric Inductor Breaks Resistance Quantum “Limit” Physics 13, 141 (2020)