Universität zu Köln

Oshnik, Nimba, Rembold, Phila ORCID: 0000-0003-1405-730X, Calarco, Tommaso, Montangero, Simone, Neu, Elke ORCID: 0000-0003-1904-3206 and Muller, Matthias M. (2022). Robust magnetometry with single nitrogen-vacancy centers via two-step optimization. Phys. Rev. A, 106 (1). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9934

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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 and 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(-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(-1/2) giving a twofold 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Oshnik, Nimba UNSPECIFIED UNSPECIFIED UNSPECIFIED Rembold, Phila UNSPECIFIED orcid.org/0000-0003-1405-730X UNSPECIFIED Calarco, Tommaso UNSPECIFIED UNSPECIFIED UNSPECIFIED Montangero, Simone UNSPECIFIED UNSPECIFIED UNSPECIFIED Neu, Elke UNSPECIFIED orcid.org/0000-0003-1904-3206 UNSPECIFIED Muller, Matthias M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-684622
DOI:	10.1103/PhysRevA.106.013107
Journal or Publication Title:	Phys. Rev. A
Volume:	106
Number:	1
Date:	2022
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9934
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ELECTRON SPIN; DIAMOND; PHYSICS; TIME Multiple languages Optics; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68462