Extending spin coherence times of diamond qubits by high-temperature annealing
By T. Yamamoto, T. Umeda, K. Watanabe, S. Onoda, M. Markham, Daniel J. Twitchen, B. Naydenov, L. McGuinness, T. Teraji, S. Koizumi and 7 more. 2013
146 citations recorded by the source corpus.
Spins of negatively charged nitrogen-vacancy (NV$^-$) defects in diamond are among the most promising candidates for solid-state qubits. The fabrication of quantum devices containing these spin-carrying defects requires position-controlled introduction of NV$^-$ defects having excellent properties such as spectral stability, long spin coherence time, and stable negative charge state. Nitrogen ion implantation and annealing enable the positioning of NV$^-$ spin qubits with high precision, but to date, the coherence times of qubits produced this way are short, presumably because of the presence of residual radiation damage. In the present work, we demonstrate that a high temperature annealing at 1000$^\circ$C allows 2 millisecond coherence times to be achieved at room temperature. These results were obtained for implantation-produced NV$^-$ defects in a high-purity, 99.99% $^{12}$C enriched single crystal chemical vapor deposited diamond. We discuss these remarkably long coherence times in the context of the thermal behavior of residual defect spins. [Published in Physical Review B {\bf{88}}, 075206 (2013)]
Subfields: Electrical and Electronic Engineering, Geophysics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/4c75d25bad9c587fca45f8285a85ca9bdf478fc8
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Citations in the corpus
- Sensitivity optimization for NV-diamond magnetometry (2019, methodology): “Controlled coupling of NVspin pairs (Bernien et al., 2013; Dolde et al., 2013; Hensen et al., 2015; Jakobi et al., 2016; Neumann et al., 2010b; Yamamoto et al., 2013a) has been demonstrated; however, applying entanglement-enhanced techniques to larger ensembles is expected to be challenging.”
- Magnetometry with nitrogen-vacancy defects in diamond (2013, background): “NV spin-coherence times was performed and identified an ideal temperature range for annealing of 1000–1100 ◦C [93].”
- Ultralong Dephasing Times in Solid-State Spin Ensembles via Quantum Control (2018, background): “Additional smaller peaks i and ii are attributed to dipole-forbidden nitrogen spin transitions and other electronic dark spins [49].”