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Geometry-tunable directional ground-state cooling in an optomechanical resonator
Optics Express
|July 2, 2026
Summary
We demonstrate geometry-tunable directional ground-state cooling in optomechanical resonators. This method achieves efficient cooling in one direction, even in challenging regimes, by controlling light scattering.
Area of Science:
- Quantum physics
- Optomechanics
- Nanotechnology
Background:
- Whispering-gallery-mode resonators are key for optomechanical applications.
- Achieving ground-state cooling is crucial for quantum control.
- Directional cooling presents challenges in unresolved-sideband regimes.
Purpose of the Study:
- To propose a theoretical scheme for geometry-tunable directional ground-state cooling.
- To enable efficient quantum control in whispering-gallery-mode optomechanical systems.
Main Methods:
- Coherent suppression of backscattering using an auxiliary nanoparticle.
- Application of a mode-selective parametric drive.
- Theoretical analysis of cooling response for different driving directions.
Main Results:
- Achieved strongly asymmetric cooling response based on driving direction.
- Ground-state cooling is feasible in the backward-driving configuration, even deep in the unresolved-sideband regime.
- Forward-driving configuration results in conventional, less efficient optomechanical cooling.
Conclusions:
- Coherent scattering control and parametric reservoir engineering are effective for directional cooling.
- This strategy enables chiral quantum control in whispering-gallery-mode optomechanical platforms.
- Directional cooling contrast is tunable via cavity dissipation and environmental temperature.
