• Open Access

Wide-bandwidth atomic magnetometry via instantaneous-phase retrieval

Nathanial Wilson, Christopher Perrella, Russell Anderson, André Luiten, and Philip Light
Phys. Rev. Research 2, 013213 – Published 26 February 2020

Abstract

We develop and demonstrate a new protocol that allows sensing of magnetic fields in an extra-ordinary regime for atomic magnetometry. Until now, the demonstrated bandwidth for atomic magnetometry has been constrained to be slower than the natural precession of atomic spins in a magnetic field—the Larmor frequency. We demonstrate an approach that tracks the instantaneous phase of atomic spins to measure arbitrarily modulated magnetic fields with frequencies up to 50 times higher than the Larmor frequency. By accessing this regime, we demonstrate magnetic-field measurements across four decades in frequency up to 400kHz, over three orders of magnitude wider than conventional atomic magnetometers. Furthermore, we demonstrate that our protocol can linearly detect transient fields 100-fold higher in amplitude than conventional methods. We highlight the bandwidth and dynamic range of the technique by measuring a magnetic field with a broad and dynamical spectrum.

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  • Received 20 September 2019
  • Revised 21 October 2019
  • Accepted 30 January 2020

DOI:https://doi.org/10.1103/PhysRevResearch.2.013213

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Nathanial Wilson1, Christopher Perrella1,*, Russell Anderson2, André Luiten1,†, and Philip Light1

  • 1Institute for Photonics and Advanced Sensing (IPAS), and School of Physical Sciences, University of Adelaide, South Australia 5005, Australia
  • 2La Trobe Institute for Molecular Science, and School of Molecular Sciences, La Trobe University, Victoria 3552, Australia

  • *chris.perrella@adelaide.edu.au
  • andre.luiten@adelaide.edu.au

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Vol. 2, Iss. 1 — February - April 2020

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