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arXiv · 2511.10318

Optomechanical Cooling without Residual Heating

Surangana Sengupta·Björn Kubala·Joachim Ankerhold·Ciprian Padurariu
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Abstract

Resolved-sideband cooling is a standard technique in cavity optomechanics enabling quantum control of mechanical motion, but its performance is ultimately limited by quantum backaction heating. This fundamental effect imposes a limit on the minimum achievable mechanical phonon number, establishing a finite-temperature floor regardless of the applied cooling strength. We generalize the semi-classical model for optomechanical cooling to describe universal cavity Hamiltonians incorporating both passive and active nonlinearities. As a concrete demonstration, we analyze the simplest circuit optomechanical system that implements a nonlinear drive via a Josephson junction. Our analysis reveals that this active nonlinear drive can eliminate the residual heating backaction, thereby comparing favorably with alternative optomechanical cooling schemes based on passive nonlinearities arXiv:2202.13228. By successfully overcoming the finite-temperature floor that limits conventional schemes, our method paves the way for unprecedented quantum control over mechanical systems and establishes the experimental viability of zero-heating optomechanical cooling.

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Surangana Sengupta, Björn Kubala, Joachim Ankerhold, Ciprian Padurariu. 2025-11-13. Optomechanical Cooling without Residual Heating. https://arxiv.org/abs/2511.10318

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