Berlin 2024 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 18: Poster II
QI 18.13: Poster
Mittwoch, 20. März 2024, 11:00–14:30, Poster A
Concatenated Continuous Dynamic Decoupling of Ensemble NV Centers in Diamond for GHz-range AC magnetometry — •Takuya Kitamura1,2, Hitoshi Sumiya3, Shinobu Onoda4, Junichi Isoya5, and Fedor Jelezko1,2 — 1Institute for Quantum Optics, Ulm Univesity, Ulm, Germany — 2Center for Integrated Quantum Science and Technology(IQST), Germany — 3Sumitomo Electric Industries Ltd., Itami, Japan — 4National Institutes for Quantum Science and Technology, Takasaki, Japan — 5Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
GHz-range AC magnetometry with microwave dressed states are well studied for single Nitrogen-Vacancy(NV) centers in diamond. To increase its sensitivity, use of ensemble NVs is essential. Increase of the sensor spins means increase of the spins to be controlled. In particular, this is critical for the dressed-based magnetometer because the quality of the dressed states is affected by the homogeneity of the control fields.
Here, concatenated continuous dynamical decoupling (CCDD) is applied to 500 micrometer thick NV diamond. Prolongation of the coherence time is observed, but it is still not good enough for sensing because of the huge inhomogeneity in the microwave control fields. In order to understand the effect of inhomogeneity on the CCDD, we quantatively characterize the inhomogeneity of the fields by analyzing the decay of Rabi oscillations. This makes a important step toward sensitive GHz-range AC magnetometry with ensemble NV centers.
Keywords: Quantum sensing; Diamond NV centers; Dynamical decoupling; Magnetic resonance; Quantum mechanics