Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session G41: Magnetic Characterization and Imaging
11:15 AM–2:03 PM,
Tuesday, March 3, 2020
Room: 707
Sponsoring
Unit:
GMAG
Chair: Cosmin Radu, Lake Shore Cryotronics (United States)
Abstract: G41.00007 : NV- center magnetometry using Bayesian statistics*
Presenter:
Sergey Dushenko
(University of Maryland, College Park/National Institute of Standards and Technology)
Authors:
Sergey Dushenko
(University of Maryland, College Park/National Institute of Standards and Technology)
Kapildeb Ambal
(University of Maryland, College Park/National Institute of Standards and Technology)
Robert McMichael
(National Institute of Standards and Technology)
The NV- center is a quantum defect with spin 1 and coherence time up to several milliseconds at room temperature. Zeeman splitting of NV- energy levels allows detection of the magnetic field via photoluminescence. It is an excellent platform for magnetometry with potential spatial resolution down to few nanometers and demonstrated sensitivity down to nT/Hz1/2.
We compare conventional magnetic field measurement of fluorescence under pre-determined sweeps of microwave frequency with the measurement using a Bayesian statistics methodology. In the Bayesian experimental design, the frequency of each measurement is determined in real-time from utility predictions based on the accumulated experimental data. We report order of magnitude increase in the precision of magnetic field and hyperfine splitting determination for the same measurement time in the Bayesian scheme, compared with the conventional scheme.
*S.D., K.A. acknowledge support under the Cooperative Research Agreement between the University of Maryland and the National Institute of Standards and Technology, Award 70NANB14H209, through the University of Maryland.
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