Abstract
Ensembles of nitrogen-vacancy centers in diamond are widely used as AC magnetometers. While such measurements are usually performed using standard (XY) dynamical decoupling (DD) protocols at room temperature, we study the sensitivities achieved by utilizing various DD protocols, for measuring magnetic AC fields at frequencies in the 10-250 kHz range, at room temperature and 77 K. By performing measurements on an isotopically pure 12C sample, we find that the Carr-Purcell-Meiboom-Gill protocol, which is not robust against pulse imperfections, is less efficient for magnetometry than robust XY-based sequences. The concatenation of a standard XY-based protocol may enhance the sensitivities only for measuring high-frequency fields, for which many (> 500) DD pulses are necessary and the robustness against pulse imperfections is critical. Moreover, we show that cooling is effective only for measuring low-frequency fields (∼10 kHz), for which the experiment time approaches T 1 at a small number of applied DD pulses.
Original language | American English |
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Article number | 024008 |
Journal | Journal of Optics (United Kingdom) |
Volume | 20 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2018 |
Bibliographical note
Funding Information:We thank Linh My Pham for the fruitful discussions. This work has been supported in part by the EU CIG, the Minerva ARCHES award, the Israel Science Foundation (grant No. 750/14), the Ministry of Science and Technology, Israel, the CAMBR fellowship for Nanoscience and Nanotechnology, the AFOSR/DARPA QuASAR program, the German Federal Ministry of Education and Research (BMBF) within the Quantumtechnologien program (FKZ 13N14439), and DFG through the DIP program (FO 703/2-1).
Publisher Copyright:
© 2018 IOP Publishing Ltd.
Keywords
- NV centers
- dynamical decoupling
- magnetic sensing
- magnetometry
- nitrogen-vacancy