Spatial noise correlations in a Si/SiGe two-qubit device from Bell state coherences
Spatial noise correlations in a Si/SiGe two-qubit device from Bell state coherences
We study spatial noise correlations in a Si/SiGe two-qubit device with integrated micromagnets. Our method relies on the concept of decoherence-free subspaces, whereby we measure the coherence time for two different Bell states, designed to be sensitive only to either correlated or anti-correlated noise respectively. From these measurements, we find …