Quantum information process with nanometre precession ion implantation

The spin state of a single nitrogen-vacancy centre in diamond is one of the most attractive candidate for quantum information processing because of its long spin coherence time. Further more coupling (magnetic dipole) between the spins are required for scalable quantum computing (2-qbit operation). This process requires a high implantation positioning accuracy and nitrogen free clean diamond (<0.1 ppm nitrogen concentration). Here we report recent progress towards single ion implantation within nanometre scale accuracies. (orig.)