The dynamics of single electron and nuclear spins in a diamond lattice with different nuclear spin concentration is investigated. It is shown that coherent control of up to three individual nuclei in a dense nuclear spin cluster is feasible. The free-induction decays of nuclear spin Bell states and single nuclear coherences among nuclear spins are compared and analyzed. Reduction in a free-induction-decay time and a coherence time upon increase in nuclear spin concentration has been found. For pure diamond, as long as and of up to 0.65 ms for the electron spin has been observed. The concentration dependence of is explained by Fermi contact and dipolar interactions with nuclei in the lattice. It has been found that decreases approximately as , where is concentration, which corresponds to the reported theoretical line of for an electron spin interacting with a nuclear spin bath.
- Received 19 June 2009
©2009 American Physical Society