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

• Published in: Chinese physics B Vol. 33; no. 5; pp. 58402 - 680
• Main Authors: Wang, Chen-Guang, Yue, Wen-Cheng, Tu, Xuecou, Chi, Tianyuan, Guo, Tingting, Lyu, Yang-Yang, Dong, Sining, Cao, Chunhai, Zhang, Labao, Jia, Xiaoqing, Sun, Guozhu, Kang, Lin, Chen, Jian, Wang, Yong-Lei, Wang, Huabing, Wu, Peiheng
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.04.2024
• Subjects: kinetic inductance; NbN; superconducting resonator; tunable resonator; superconducting resonator; NbN; tunable resonator; kinetic inductance
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/ad2f21

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.