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6CCVD Research

Enhancing the Ramsey contrast of an NV-ensemble in diamond using quantum optimal control

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2025-08-27
JournalQuantum Science and Technology
AuthorsIsabell Jauch, Artur Skljarow, Thomas Strohm, Florian Dolde, Tino Fuchs

Abstract

Section titled ā€œAbstractā€

Abstract Negatively charged nitrogen-vacancy (NV) centers in diamonds are commonly used in quantum magnetometry. However, the potential of this approach is often limited by the inhomogeneity of the driving field. In this study, we explore the potential of closed-loop quantum optimal control to improve DC Ramsey magnetometry with NV-ensembles suffering from inhomogeneous microwave (MW) fields and MW power limitations. We demonstrate an improvement of the optically detected Ramsey contrast up to a factor of 3.13. This enables noticeable power savings for miniaturized devices without loss in magnetometry performance. Additionally, we show a recovery of 86.3% of the Ramsey contrast in presence of a five times less homogeneous MW field compared to the homogeneous field of a MW Helmholtz coil pair.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

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