Ultra-low noise magnetic field for quantum gases
arXiv:1904.11642 · doi:10.1063/1.5087957
Abstract
Ultra-low noise magnetic field is essential for many branches of scientific research. Examplesinclude experiments conducted on ultra-cold atoms, quantum simulations, as well as precisionmeasurements. In ultra-cold atom experiments specifically, a bias magnetic field will be oftenserved as a quantization axis and be applied for Zeeman splitting. As atomic states areusually sensitive to magnetic fields, a magnetic field characterized by ultra-low noise as wellas high stability is typically required for experimentation. For this study, a bias magneticfield is successfully stabilized at 14.5G, with the root mean square (RMS) value of the noisereduced to 18.5μG (1.28ppm) by placingμ-metal magnetic shields together with a dynamicalfeedback circuit. Long-time instability is also regulated consistently below 7μG. The level ofnoise exhibited in the bias magnetic field is further confirmed by evaluating the coherencetime of a Bose-Einstein condensate characterized by Rabi oscillation. It is concluded thatthis approach can be applied to other physical systems as well.
arXiv comment7 pages, 5 figures
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- Generation of squeezed optical states via stored classical pulses in a Bose gas
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- Measuring entanglement without local addressing in quantum many-body simulators via spiral quantum state tomography