Recent work on Ising-coupled double-quantum-dot spin qubits in GaAs with voltage-controlled exchange interaction has shown improved two-qubit gate fidelities from the application of oscillating exchange along with a strong magnetic field gradient between adjacent dots. By examining how noise propagates in the time-evolution operator of the system, we find an optimal set of parameters that provide passive stroboscopic circumvention of errors in two-qubit gates to first order. We predict over 99% two-qubit gate fidelities in the presence of quasistatic and 1/f noise, which is an order of magnitude improvement over the typical unoptimized implementation.
@article{arxiv.1810.04208,
title = {Stroboscopically Robust Gates For Capacitively Coupled Singlet-Triplet Qubits},
author = {R. K. L. Colmenar and J. P. Kestner},
journal= {arXiv preprint arXiv:1810.04208},
year = {2019}
}