Robust electric dipole transition of a nuclear-spin in silicon

Dr Guilherme Tosi
4pm Thursday 25 May 2017
CQC2T Conference Room, Level 2, Newton Building J12, UNSW Kensington Campus

The nuclear spin state of a phosphorus donor in isotopically enriched silicon-28 (Si:P) is an excellent host to store quantum information in the solid state. The spin's insensitivity to electric fields yield a solid-state qubit with record coherence times, but also renders coupling to other quantum systems very challenging. I will show that, by coupling the phosphorus donor to an electron shared with an interface dot, a magnetic drive creates a strong electric dipole

(> 50 Debye) transition for the donor nuclear spin. The magnetic drive also stabilizes the spin's phase and electric dipole, thereby suppressing decoherence arising from electrical noise. This robust electric dipole brings the Si:P nuclear qubit into the realm of hybrid quantum systems and opens up new avenues in quantum information processing.