Deep three-dimensional solid-state qubit arrays with long-lived spin coherence

Stephen, C. J. and Green, B. L. and Lekhai, Y. N. D. and Weng, L. and Hill, P. and Johnson, S. and Frangeskou, A. C. and Diggle, P. L. and Chen, Y.-C. and Strain, M. J. and Gu, E. and Newton, M. E. and Smith, J. M. and Salter, P. S. and Morley, G. W. (2019) Deep three-dimensional solid-state qubit arrays with long-lived spin coherence. Physical Review Applied, 12 (6). 064005. ISSN 2331-7043 (

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Nitrogen-vacancy centers (NVCs) in diamond show promise for quantum computing, communication, and sensing. However, the best current method for entangling two NVCs requires that each one is in a separate cryostat, which is not scalable. We show that single NVCs can be laser written 6–15-µm deep inside of a diamond with spin coherence times that are an order of magnitude longer than previous laser-written NVCs and at least as long as naturally occurring NVCs. This depth is suitable for integration with solid immersion lenses or optical cavities and we present depth-dependent T2 measurements. 200 000 of these NVCs would fit into one diamond.