Tunable superconducting resonators via on-chip control of local magnetic field

TL;DR

This paper presents a method to dynamically tune superconducting microwave resonators using on-chip control of local magnetic fields, enhancing their flexibility for quantum computing applications.

Contribution

Introduction of a frequency-tunable superconducting resonator controlled via on-chip magnetic fields, enabling continuous frequency adjustment with a significant tuning range.

Findings

Achieved a 54.85 MHz tuning range in a 6.21 GHz resonator

Demonstrated on-chip magnetic field control for frequency tuning

Potential applications in quantum communication and memory

Abstract

Superconducting microwave resonators play a pivotal role in superconducting quantum circuits. The ability to fine-tune their resonant frequencies provides enhanced control and flexibility. Here, we introduce a frequency-tunable superconducting coplanar waveguide resonator. By applying electrical currents through specifically designed ground wires, we achieve the generation and control of a localized magnetic field on the central line of the resonator, enabling continuous tuning of its resonant frequency. We demonstrate a frequency tuning range of 54.85 MHz in a 6.21 GHz resonator. This integrated and tunable resonator holds great potential as a dynamically tunable filter and as a key component of communication buses and memory elements in superconducting quantum computing.