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TT: Fachverband Tiefe Temperaturen
TT 89: Cryotechnique: Refrigeration
TT 89.4: Vortrag
Donnerstag, 12. März 2026, 17:30–17:45, HSZ/0103
Optomechanical Cooling without Residual Heating — Surangana Sengupta1, Björn Kubala1,2, Joachim Ankerhold1, and •Ciprian Padurariu1 — 1Institute for Complex Quantum Systems and IQST, Ulm University — 2German Aerospace Center (DLR), Institute of Quantum Technologies, Ulm
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 [1]. 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.
[1] D. Zoepfl et al., Phys. Rev. Lett. 130, 033601 (2023).
Keywords: optomechanical cooling; nonlinear drive; squeezing; microwave resonator; Josephson optomechanics