Frequency Tunable and Q Switchable Superconducting Resonators for Spin Qubit Control

Most Si/SiGe quantum processors depend on coupling to on-chip micromagnets for quantum control via electrically driven spin resonance (EDSR). While electrical control via micromagnets has been shown to yield high fidelity qubit operations [1], they induce a synthetic spin-orbit interaction, which reduces dephasing and relaxation times [2,3], and provides significant scaling challenges. Here, by utilizing high kinetic inductance superconductors, we demonstrate a versatile resonator design that offers the frequency and Q tunability necessary for developing fast, magnetically driven resonant gates in our micromagnet-free architecture. Initial design considerations and device performance will be discussed.

[1] J. Yoneda et al., Nat. Nanotechnol. 13, 102 (2018)

[2] F. Borjans et al., Phys. Rev. Appl. 11, 044063 (2019)

[3] T. Struck et al., Npj Quantum Inf. 6, 40 (2020)