Ionized nitrogen molecules (15N2+) are used as efficient point sources for creating NV− pairs in diamond with nanoscale spatial separation and up to 55 kHz magnetic coupling strength. Co-implantation of 12C+ increased the yield of pairs, and a 13C-depleted diamond allowed 0.65 ms coherence times to be obtained. Further coupling to a third dark spin provided a strongly coupled three spin register. These results mark an important step towards realization of multi-qubit systems and scalable NV− quantum registers.
@article{arxiv.1311.0978,
title = {Strongly Coupled Diamond Spin Qubits by Molecular Nitrogen Implantation},
author = {Takashi Yamamoto and Christoph Müller and Liam P. McGuinness and Tokuyuki Teraji and Boris Naydenov and Shinobu Onoda and Takeshi Ohshima and Jörg Wrachtrup and Fedor Jelezko and Junichi Isoya},
journal= {arXiv preprint arXiv:1311.0978},
year = {2013}
}
Comments
Accepted for publication in Physical Review B: rapid communications