Good news everyone! Our preprint Optimal operation of hole spin qubits just got on the arxiv!!

One of the most challenging problems in spin-orbit qubits is the variability in their properties; hole spins are susceptible to electric and magnetic fields from the environment in non-trivial ways. In this paper, we scale sweet spots one dimension up to sweet lines, we experimentally find and characterize sweet lines in magnetic field orientation where the hole spin is insensitive to charge noise. Furthermore, we take the challenge up towards beating the variability issue by aligning two different qubits into a simultaneous sweet spot, where both qubits are optimally operated yielding quality factors of 1200. This experimental evidence strongly supports both the sweetlines and reciprocal sweetness relation we found in 2022 (see our g-matrix spin-photon paper.).