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Engineered entropic forces allow ultrastrong dynamical backaction
Andreas Sawadsky1, Raymond A Harrison1, Glen I Harris1
1ARC Centre of Excellence for Engineered Quantum Systems, School of Mathematics and Physics, University of Queensland, St. Lucia, QLD 4072, Australia.
Science Advances
|May 24, 2023
Summary
Researchers harnessed light’s entropic forces, exceeding radiation pressure by eight orders of magnitude. This breakthrough enables enhanced phonon lasing and opens new avenues for quantum devices and nonlinear fluid studies.
Area of Science:
- Quantum optics
- Condensed matter physics
- Nonlinear dynamics
Background:
- Light confined in optical cavities exerts radiation pressure.
- Dynamical backaction is crucial for laser cooling and quantum applications.
- Radiation pressure is limited by photon-phonon energy mismatch.
Purpose of the Study:
- To overcome the limitations of radiation pressure using entropic forces.
- To engineer dynamical backaction from entropic forces.
- To achieve low-threshold phonon lasing and explore nonlinear fluid phenomena.
Main Methods:
- Utilizing entropic forces from light absorption.
- Demonstrating the effect in a superfluid helium third-sound resonator.
- Developing a framework for entropic force-driven backaction.
Main Results:
- Entropic forces were shown to exceed radiation pressure by eight orders of magnitude.
- Phonon lasing was achieved with a threshold three orders of magnitude lower than previous methods.
- A new framework for engineering dynamical backaction was established.
Conclusions:
- Entropic forces offer a powerful new mechanism for manipulating quantum systems.
- This work provides a pathway for advanced quantum devices and the study of nonlinear fluid dynamics.
- The demonstrated low-threshold phonon lasing has significant implications for quantum technologies.
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