We experimentally studied the switching off processes in the double-resonator coupler superconducting quantum circuit. In both frequency and time-domain, we observed the variation of qubit-qubit effective coupling by tuning the frequency differences between qubits and the double-resonator coupler. According to the measurement results, by just shifting about 50 MHz of qubits' frequencies, we can tune the effective qubit-qubit coupling strength from switching off point to two qubit gate point (effective coupling larger than 5 MHz) in double-resonator superconducting quantum circuit.The double-resonator (coupler) superconducting quantum circuit has the advantage of simple fabrications, introducing less flux noises, reducing occupancy of dilution refrigerator cables,which might supply a promising platform for future large-scale superconducting quantum processors.
@article{arxiv.2602.11576,
title = {Control the qubit-qubit coupling with double superconducting resonators},
author = {Hui Wang and Rui Wang and Daichi Sugiyama and Chih-Yao Shih and Ching-Yeh Chen and Hiroto Mukai and Hang Xue and J. S. Tsai},
journal= {arXiv preprint arXiv:2602.11576},
year = {2026}
}