TY  - JOUR
AU  - Oshnik, Nimba
AU  - Rembold, Phila
AU  - Calarco, Tommaso
AU  - Montangero, Simone
AU  - Neu, Elke
AU  - Müller, Matthias
TI  - Robust magnetometry with single nitrogen-vacancy centers via two-step optimization
JO  - Physical review / A
VL  - 106
IS  - 1
SN  - 2469-9926
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2022-03846
SP  - 013107
PY  - 2022
AB  - 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 1µT Hz− 1for an 83% decrease in control power, increasingthe robustness by approximately one third. The optimized Ramsey measurements produce sensitivities below 100 nT Hz 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000832482600001
DO  - DOI:10.1103/PhysRevA.106.013107
UR  - https://juser.fz-juelich.de/record/910457
ER  -