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- W4285043331 abstract "Shallow Nitrogen-Vacancy (NV) centers are promising candidates for high-precision sensing applications; these defects, when positioned a few nanometers below the surface, provide an atomic-scale resolution along with substantial sensitivity. However, the dangling bonds and impurities on the diamond surface result in a complex environment which reduces the sensitivity and is unique to each shallow NV center. To avoid the environment's detrimental effect, we apply feedback-based quantum optimal control. We first show how a direct search can improve the initialization/readout process. In a second step, we optimize microwave pulses for pulsed Optically Detected Magnetic Resonance (ODMR) and Ramsey measurements. Throughout the sensitivity optimizations, we focus on robustness against errors in the control field amplitude. This feature not only protects the protocols' sensitivity from drifts but also enlarges the sensing volume. The resulting ODMR measurements produce sensitivities below 1$mu$T,Hz$^{-frac{1}{2}}$ for an 83% decrease in control power, increasing the robustness by approximately one third. The optimized Ramsey measurements produce sensitivities below 100,nT,Hz$^{-frac{1}{2}}$ giving a two-fold sensitivity improvement. Being on par with typical sensitivities obtained via single NV magnetometry, the complementing robustness of the presented optimization strategy may provide an advantage for other NV-based applications." @default.
- W4285043331 created "2022-07-13" @default.
- W4285043331 creator A5003672540 @default.
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- W4285043331 date "2022-07-11" @default.
- W4285043331 modified "2023-10-14" @default.
- W4285043331 title "Robust magnetometry with single nitrogen-vacancy centers via two-step optimization" @default.
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- W4285043331 doi "https://doi.org/10.1103/physreva.106.013107" @default.
- W4285043331 hasPublicationYear "2022" @default.
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