We report individual confinement and two-axis qubit operations of two electron spin qubits in GaAs gate-defined sextuple quantum dot array with integrated micro-magnet. As a first step toward multiple qubit operations, we demonstrate coherent manipulations of three singlet-triplet qubits showing underdamped Larmor and Ramsey oscillations in all double dot sites. We provide an accurate measure of site site-dependent field gradients and rms electric and magnetic noise, and we discuss the adequacy of simple rectangular micro-magnet for practical use in multiple quantum dot arrays. We also discuss current limitations and possible strategies for realizing simultaneous multi multi-qubit operations in extended linear arrays.
@article{arxiv.2009.13182,
title = {Three individual two-axis control of singlet-triplet qubits in a micromagnet integrated quantum dot array},
author = {Wonjin Jang and Min-Kyun Cho and Jehyun Kim and Hwanchul Chung and Vladimir Umansky and Dohun Kim},
journal= {arXiv preprint arXiv:2009.13182},
year = {2021}
}