Fast Tunable High-Q-Factor Superconducting Microwave Resonators
Journal article, 2020

We present fast tunable superconducting microwave resonators fabricated from planar NbN on a sapphire substrate. The 3 lambda/4 wavelength resonators are tuning fork shaped and tuned by passing a dc current that controls the kinetic inductance of the tuning fork prongs. The lambda/4 section from the open end operates as an integrated impedance converter that creates a nearly perfect short for microwave currents at the dc terminal coupling points, thus preventing microwave energy leakage through the dc lines. We measure an internal quality factor Q(int) > 10(5) over the entire tuning range. We demonstrate a tuning range of greater than 3% and tuning response times as short as 20 ns for the maximum achievable detuning. Because of the quasifractal design, the resonators are resilient to magnetic fields of up to 0.5 T.

Optoelectronics

Quantum information with solid state qubits

Author

Sumedh Mahashabde

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Ernst Otto

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Domenico Montemurro

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Sebastian de Graaf

National Physical Laboratory (NPL)

Sergey Kubatkin

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Andrey Danilov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Physical Review Applied

2331-7019 (eISSN)

Vol. 14 4 044040

Subject Categories

Accelerator Physics and Instrumentation

Other Physics Topics

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1103/PhysRevApplied.14.044040

More information

Latest update

2/28/2021