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

MetadataDetails
Publication Date2019-12-03
JournalStrathprints: The University of Strathclyde institutional repository (University of Strathclyde)
AuthorsColin Stephen, Ben L. Green, Yashna Lekhai, Laiyi Weng, P. Hill
InstitutionsUniversity of Oxford, Engineering and Physical Sciences Research Council
Citations42

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 T<sub>2</sub> measurements. 200 000 of these NVCs would fit into one diamond.