Minute-long quantum coherence enabled by electrical depletion of magnetic noise
arXiv:2504.13164
The paper demonstrates that applying an electrical bias to an isotopically purified SiC p‑i‑n diode can deplete magnetic noise, extending the coherence and relaxation times of embedded electronic and nuclear spins to over 100 seconds.
Abstract
Integrating solid-state spin defects into classical electronic devices can enable new opportunities for quantum information processing that benefit from existing semiconductor technology. Here, we investigate the impact of bias control of an isotopically purified silicon carbide (SiC) p-i-n diode on the coherence of embedded spins. We show that the diode allows for the depletion of not only the electrical, but also the magnetic noise sources. This results in extended relaxation and coherence times of individual electronic and nuclear spins, with Hahn echo times exceeding values reported for single spins in any platform (> 100 seconds). These results demonstrate the importance of materials control and electronic device integration to create highly coherent solid-state quantum technology.
17 pages, 4 figures