Femtotesla nearly quantum-noise-limited pulsed gradiometer at
Earth-scale fields
- URL: http://arxiv.org/abs/2112.09004v1
- Date: Thu, 16 Dec 2021 16:39:11 GMT
- Title: Femtotesla nearly quantum-noise-limited pulsed gradiometer at
Earth-scale fields
- Authors: V. G. Lucivero, W. Lee, M. V. Romalis, M. E. Limes, E. L. Foley, T. W.
Kornack
- Abstract summary: We describe a finite fields magnetic gradiometer using an intense pulsed laser to polarize a $87$Rb atomic ensemble and a compact VCSEL probe laser to detect paramagnetic rotation in a single multipass cell.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We describe a finite fields magnetic gradiometer using an intense pulsed
laser to polarize a $^{87}$Rb atomic ensemble and a compact VCSEL probe laser
to detect paramagnetic Faraday rotation in a single multipass cell. We report
differential magnetic sensitivity of $14$ fT/Hz$^{1/2}$ over a broad dynamic
range including Earth's field magnitude and common-mode rejection ratio higher
than $10^4$. We also observe a nearly quantum-noise-limited behaviour of the
gradiometer, by comparing the experimental standard deviation of the estimated
frequency difference against the Cram\'{e}r-Rao lower bound in the presence of
white photon shot-noise, atomic spin noise and atomic diffusion.
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