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Autonomous Feedback Stabilization of a Cavity-Coupled Spin Oscillator.
Julian Wolf1,2, Olive H Eilbott1,2, Joshua A Isaacs1,2
1University of California, Department of Physics, Berkeley, California 94720, USA.
Physical Review Letters
|February 21, 2025
Summary
We stabilized atomic spin ensembles out-of-equilibrium using optical cavity feedback. This method allows for precise control of spin states at any energy level, confirmed by experimental data matching theoretical predictions.
Area of Science:
- Atomic physics
- Quantum optics
- Condensed matter physics
Background:
- Atomic ensembles are crucial for quantum technologies.
- Controlling collective spin states is challenging due to decoherence.
- Existing methods often require specific energy levels or complex setups.
Purpose of the Study:
- To demonstrate out-of-equilibrium stabilization of atomic spin ensembles.
- To utilize autonomous feedback from a driven optical cavity for spin control.
- To achieve stabilization at arbitrary energy levels.
Main Methods:
- Employing a driven optical cavity with dispersive coupling to an atomic ensemble.
- Applying a magnetic field at an angle to the cavity axis.
- Utilizing coherent backaction from cavity light, conditioned by cavity susceptibility.
Main Results:
- Achieved out-of-equilibrium stabilization of the collective spin.
- Demonstrated sensitivity to both longitudinal and transverse spin components.
- Verified stabilization of the spin state at arbitrary energies.
- Experimental results closely matched analytic predictions for setpoint tracking and gain spectrum.
Conclusions:
- Autonomous optical cavity feedback is an effective method for stabilizing atomic spin ensembles.
- This technique offers precise control over quantum states.
- The findings have implications for quantum information processing and precision measurements.
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