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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Squeezed-Light Enhancement and Backaction Evasion in a High Sensitivity Optically Pumped Magnetometer.

C Troullinou1, R Jiménez-Martínez1, J Kong2

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Optical polarization squeezing enhances quantum-noise-limited magnetometers by improving sensitivity and bandwidth. This method demonstrates evasion of measurement backaction noise in Bell-Bloom optically pumped magnetometers.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Measurement Science

Background:

  • Optically pumped magnetometers (OPMs) are sensitive quantum measurement devices.
  • Performance is often limited by quantum noise, including spin projection noise and photon shot noise.
  • Bell-Bloom (BB) optical pumping is a technique used for OPMs.

Purpose of the Study:

  • To investigate the impact of optical polarization squeezing on OPM performance.
  • To demonstrate the evasion of measurement backaction noise.
  • To develop a theoretical model for quantum noise dynamics in BB magnetometers.

Main Methods:

  • Utilized Bell-Bloom optical pumping of ^{87}Rb vapor.
  • Employed Faraday rotation for detecting spin precession.
  • Applied probe polarization squeezing to the magnetometer setup.

Main Results:

  • Achieved sub-pT/sqrt[Hz] sensitivity, limited by spin projection noise and photon shot noise.
  • Demonstrated improved high-frequency sensitivity and increased measurement bandwidth using polarization squeezing.
  • Showcased evasion of measurement backaction noise without sensitivity loss.

Conclusions:

  • Optical polarization squeezing offers a viable method to enhance OPM performance.
  • The developed model explains noise reduction and backaction shunting via squeezing.
  • The technique is compatible with high-density and multipass methods for extreme sensitivity.