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arXiv · 1405.5837

Isotopic identification of engineered nitrogen-vacancy spin qubits in ultrapure diamond

T. Yamamoto·S. Onoda·T. Ohshima·T. Teraji·K. Watanabe·S. Koizumi·T. Umeda·L. P. McGuinness·C. Müller·B. Naydenov·F. Dolde·H. Fedder·J. Honert·M. L. Markham·D. J. Twitchen·J. Wrachtrup·F. Jelezko·J. Isoya
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Abstract

Nitrogen impurities help to stabilize the negatively-charged-state of NV$^-$ in diamond, whereas magnetic fluctuations from nitrogen spins lead to decoherence of NV$^-$ qubits. It is not known what donor concentration optimizes these conflicting requirements. Here we used 10-MeV $^{15}$N$^{3+}$ ion implantation to create NV$^-$ in ultrapure diamond. Optically detected magnetic resonance of single centers revealed a high creation yield of $40\pm3$% from $^{15}$N$^{3+}$ ions and an additional yield of $56\pm3$% from $^{14}$N impurities. High-temperature anneal was used to reduce residual defects, and charge stable NV$^-$, even in a dilute $^{14}$N impurity concentration of 0.06 ppb were created with long coherence times.

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T. Yamamoto, S. Onoda, T. Ohshima, T. Teraji, K. Watanabe, S. Koizumi, T. Umeda, L. P. McGuinness, C. Müller, B. Naydenov, F. Dolde, H. Fedder, J. Honert, M. L. Markham, D. J. Twitchen, J. Wrachtrup, F. Jelezko, J. Isoya. 2014-05-22. Isotopic identification of engineered nitrogen-vacancy spin qubits in ultrapure diamond. https://doi.org/10.1103/physrevb.90.081117

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