Isotopic identification of engineered nitrogen-vacancy spin qubits in ultrapure diamond
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 15N3+ ion implantation to create NV- in ultrapure diamond. Optically detected magnetic resonance of single centers revealed a high creation yield of 403% from 15N3+ ions and an additional yield of 563% from 14N impurities. High-temperature anneal was used to reduce residual defects, and charge stable NV-, even in a dilute 14N impurity concentration of 0.06 ppb were created with long coherence times.
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