Journal Article

FZJ-2022-03846

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Robust magnetometry with single nitrogen-vacancy centers via two-step optimization

Oshnik, N.Extern* ; Rembold, P.Extern* ; Calarco, T.FZJ* ; Montangero, S.Extern* ; Neu, E.Extern* ; Müller, M.FZJ*

2022
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/32134  doi:10.1103/PhysRevA.106.013107

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 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.

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Contributing Institute(s):

1. Quantum Control (PGI-8)

Research Program(s):

1. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)

Appears in the scientific report 2022

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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