Spin coherence and depths of single nitrogen-vacancy centers created by ion implantation into diamond via screening masks

Ishizu, Shuntaro; Sasaki, Kento; Misonou, Daiki; Teraji, Tokuyuki; Itoh, Kohei M.; Abe, Eiichi

doi:10.1063/5.0012187

Cited by 4 publications

(1 citation statement)

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“…The NV layers were created by 2.5, 5, and 10 keV nitrogen ion implantation ( 15 N) in an electronic grade (e6) CVD-grown diamond, where the beam energies define the resulting NV center depth (as shown in Figure S1). The depths were simulated using “SRIM: The Stopping and Range of Ions in Matter” software .…”

Section: Methodsmentioning

confidence: 99%

Controlled Surface Modification to Revive Shallow NV^– Centers

et al. 2023

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Near-surface negatively charged nitrogen vacancy (NV) centers hold excellent promise for nanoscale magnetic imaging and quantum sensing. However, they often experience charge-state instabilities, leading to strongly reduced fluorescence and NV coherence time, which negatively impact magnetic imaging sensitivity. This occurs even more severely at 4 K and ultrahigh vacuum (UHV, p = 2 × 10 −10 mbar). We demonstrate that in situ adsorption of H 2 O on the diamond surface allows the partial recovery of the shallow NV sensors. Combining these with bandbending calculations, we conclude that controlled surface treatments are essential for implementing NV-based quantum sensing protocols under cryogenic UHV conditions.

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Section: Methodsmentioning

confidence: 99%

Controlled Surface Modification to Revive Shallow NV^– Centers

et al. 2023

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Protecting qubit coherence by spectrally engineered driving of the spin environment

et al. 2022

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Modern quantum technologies rely crucially on techniques to mitigate quantum decoherence; these techniques can be either passive, achieved for example via materials engineering, or active, typically achieved via pulsed monochromatic driving fields applied to the qubit. Using a solid-state defect spin coupled to a microwave-driven spin bath, we experimentally demonstrate a decoherence mitigation method based on spectral engineering of the environmental noise with a polychromatic drive waveform, and show that it outperforms monochromatic techniques. Results are in agreement with quantitative modeling, and open the path to active decoherence protection using custom-designed waveforms applied to the environment rather than the qubit.

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