Speaker: Alexander Jakob, University of Melbourne
Date/ Time: Tuesday, 24 November 2020, 2pm AEDT (1pm QLD)
The attributes of group-V-donor spins implanted in an isotopically purified 28Si crystal make them attractive qubits for large-scale quantum computer devices. Important features include long nuclear and electron spin lifetimes of 31P, hyperfine clock transitions in 209Bi and electrically controllable 123Sb nuclear spins. However, architectures for scalable quantum devices require the ability to fabricate deterministic arrays of individual donor atoms, placed with sufficient precision to enable high-fidelity quantum operations. Here we employ on-chip electrodes with charge-sensitive electronics to demonstrate the implantation of single low-energy (14 keV) P+ ions with an unprecedented 99.87±0.02% confidence, while operating close to room-temperature. This permits integration with an atomic force microscope equipped with a scanning-probe ion aperture to address the critical issue of directing the implanted ions to precise locations. These results show that deterministic single-ion implantation can be a viable pathway for manufacturing large-scale donor arrays for quantum computation and other applications.
Research link: https://arxiv.org/abs/2009.02892
Video link: TBC