Autonomous Feedback Stabilization of a Cavity-Coupled Spin Oscillator
We report out-of-equilibrium stabilization of the collective spin of an atomic ensemble through autonomous feedback by a driven optical cavity. For a magnetic field applied at an angle to the cavity axis, dispersive coupling to the cavity provides sensitivity to a combination of the longitudinal and transverse spin. Coherent backaction by cavity light onto the atoms, conditioned by the cavity susceptibility, stabilizes the spin state at an arbitrary energy. The setpoint tracking and closed-loop gain spectrum of the feedback system are characterized and found to agree closely with analytic predictions.
Authors
- Daniel Eilbott (ORCID: https://orcid.org/0000-0002-3933-9541)
- Jonathan Kohler (ORCID: https://orcid.org/0000-0003-3881-1514)
- Dan Stamper-Kurn (ORCID: https://orcid.org/0000-0002-4845-5835)
- Julian Wolf (ORCID: https://orcid.org/0000-0001-9242-5986)
- Joshua Isaacs (ORCID: https://orcid.org/0000-0003-1509-5359)
- Kevin P. Mours (ORCID: https://orcid.org/0009-0007-3602-2198)
Institutions
- Lawrence Berkeley National Laboratory (US)
- University of Kaiserslautern (DE)
- University of California System (US)
- University of California, Berkeley (US)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-02-06
- DOI
- https://doi.org/10.1103/physrevlett.134.053603
- Citations
- 2
- Primary Topic
- Mechanical and Optical Resonators
- Type
- article
- Field-Weighted Citation Impact
- 2.49
Funders
- National Science Foundation
- Heising-Simons Foundation
- Multidisciplinary University Research Initiative
- Air Force Office of Scientific Research
- Army Research Office