Automatic Calibration of Rabi-Oscillations and Stark-Shifts for Si Spin Qubits

To attain large-scale silicon quantum computers, calibration is essential since there are individual differences in qubits. Recently, there was a report on automatic calibration for Rabi oscillation measurements starting from a case with no information about the device in the order of one day [1]. In contrast, there is a need to be able to perform fast automatic calibrations, even if there is an assumption that we have some knowledge of the device. In this presentation, we made an automatic calibration system from Coulomb diamond to Rabi oscillation measurements for devices whose parameters that change little over time are known. We then carried out automatic Rabi oscillation measurements in all cases starting with different electric field conditions (more than 20 cases) in the order of 15 minutes for each, while adjusting the single-electron sensor, the tunneling rate, and estimating the microwave resonance frequency. In addition, we demonstrated that the resonance frequency was controlled in accordance with the electric field, which can be used to access qubits individually for multiple qubit operations. We appreciate IMEC for providing chips to characterize qubits.

[1] J. Schuff et.al., arXiv:2402.03931 [cond-mat.mes-hall].