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    We reduced light shifts in Coherent-Population-Trapping (CPT) atomic magnetometers by over 20 times using linearly polarized light and differential measurements. This technique improves magnetic field measurements by suppressing common drifts.

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    Area of Science:

    • Atomic physics
    • Quantum optics
    • Magnetometry

    Background:

    • Coherent-Population-Trapping (CPT) is a quantum interference effect used in atomic magnetometers.
    • Light shifts can limit the precision of CPT-based atomic magnetometers.
    • Conventional CPT magnetometers often use circularly polarized light, which can enhance light shifts.

    Purpose of the Study:

    • To demonstrate a method for suppressing light shifts in CPT atomic magnetometers.
    • To improve the accuracy and stability of magnetic field measurements using CPT.
    • To compare the effectiveness of linearly polarized light versus circularly polarized light in reducing light shifts.

    Main Methods:

    • Utilized linearly polarized light instead of circularly polarized light for CPT.
    • Implemented a differential measurement technique by rapidly switching radio frequency between two magnetic resonances.
    • Extrapolated magnetic field from the difference in center frequencies of the measured magnetic resonances.

    Main Results:

    • Achieved a light shift reduction of more than a factor of 20 compared to using circularly polarized light.
    • Demonstrated suppression of common drifts, such as collisional shifts, through careful selection of measured resonances.
    • The differential measurement approach effectively mitigates systematic errors.

    Conclusions:

    • Linear polarization and differential measurements offer a significant improvement in reducing light shifts for CPT atomic magnetometers.
    • This method enhances the precision and reliability of atomic magnetometry.
    • Further investigation into the limitations of this technique is warranted.