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High-sensitivity atomic magnetometer unaffected by spin-exchange relaxation.

J C Allred1, R N Lyman, T W Kornack

  • 1Department of Physics, Univerisity of Washington, Seattle, Washington 98195, USA.

Physical Review Letters
|September 13, 2002
PubMed
Summary

We eliminated spin-exchange relaxation in potassium (K) magnetometers by operating at high K density and low magnetic fields. This achieved a sensitivity of 10 fT Hz(-1/2), approaching the fundamental shot-noise limit.

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Area of Science:

  • Atomic physics
  • Quantum sensing
  • Magnetometry

Background:

  • Alkali-metal magnetometers offer high sensitivity, rivaling Superconducting Quantum Interference Devices (SQUIDs).
  • Spin-exchange collisions limit alkali-metal magnetometer sensitivity through relaxation.
  • Previous theoretical analyses focused on low spin polarization in low magnetic fields.

Purpose of the Study:

  • To demonstrate a potassium (K) magnetometer with eliminated spin-exchange relaxation.
  • To achieve ultra-high sensitivity in magnetic field detection.
  • To extend theoretical understanding of spin dynamics in alkali-metal vapors.

Main Methods:

  • Operating a K magnetometer at high K density and low magnetic field.
  • Eliminating spin-exchange relaxation by controlling operational parameters.

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  • Measuring signal-to-noise ratio for direct sensitivity assessment.
  • Extending theoretical analysis of spin exchange to arbitrary spin polarizations.

    • Main Results:

    • Complete elimination of spin-exchange relaxation in the K magnetometer.
    • Achieved magnetometer sensitivity of 10 femtotesla per root Hertz (fT Hz(-1/2)).
    • Identified Johnson current noise in magnetic shields as the primary limitation.
    • Estimated the shot-noise limit to be 2x10(-18) T Hz(-1/2).

    Conclusions:

    • High K density and low magnetic field operation effectively eliminates spin-exchange relaxation.
    • The demonstrated K magnetometer achieves state-of-the-art sensitivity.
    • Further improvements require minimizing magnetic noise sources and approaching the shot-noise limit.