Robust implementation of one-qubit gates despite always-on exchange coupling in silicon double quantum dots*

In a silicon two-qubit device, bandwidth constraints on exchange coupling and limitations on ESR power are important obstacles for the realization of strictly local gates, which are themselves necessary components of robust non-local gating schemes [1]. Here we show that, even in the presence of an exchange coupling stronger than one-qubit Rabi frequencies, spins can be addressed separately to implement a particular class of one-qubit gates optionally surrounded by exchange gates, and the crosstalk between them can be eliminated stroboscopically. We also show how to make such gates robust against quasistatic charge- and hyperfine-noise.

[1] U. Güngördü, J. P. Kestner, Phys. Rev. B 98, 165301 (2018)