Minute-long quantum coherence enabled by electrical depletion of magnetic noise

Integrating solid-state spin defects into classical electronic devices can enable new opportunities for quantum information processing that benefit from existing semiconductor technology. We show, through bias control of an isotopically purified silicon carbide (SiC) p-i-n diode, the depletion of not only electrical noise sources but also magnetic noise sources, resulting in record coherences for SiC electron spin qubits. We also uncover complementary improvements to the relaxation times of nuclear spin registers controllable by the defect, and measure diode-enhanced coherences. These improvements lead to record-long nuclear spin Hahn-echo times on the scale of minutes. These results demonstrate the power of materials control and electronic device integration to create highly coherent solid-state quantum network nodes and processors.