Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 90, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5087957
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Funding
- National Key R&D Program of China [2016YFA0301601]
- National Natural Science Foundation of China [11674301]
- Anhui Initiative in Quantum Information Technologies [AHY120000]
- Chinese Academy of Sciences
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A ultralow noise magnetic field is essential for many branches of scientific research. Examples include experiments conducted on ultracold atoms, quantum simulations, and precision measurements. In ultracold atom experiments specifically, a bias magnetic field will often serve as a quantization axis and be applied for Zeeman splitting. As atomic states are usually sensitive to magnetic fields, a magnetic field characterized by ultralow noise as well as high stability is typically required for experimentation. For this study, a bias magnetic field is successfully stabilized at 14.5 G, with the root mean square value of the noise reduced to 18.5 mu G (1.28 ppm) by placing mu-metal magnetic shields together with a dynamical feedback circuit. Long-time instability is also regulated consistently below 7 mu G. The level of noise exhibited in the bias magnetic field is further confirmed by evaluating the coherence time of a Bose-Einstein condensate characterized by Rabi oscillation. It is concluded that this approach can be applied to other physical systems as well. Published under license by AIP Publishing.
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