Enhancing Sideband Cooling by Feedback-Controlled Light
M Rossi (University of Camerino)
N. Kralj (University of Camerino)
Stefano Zippilli (University of Camerino, Istituto Nazionale di Fisica Nucleare - Sezione di Perugia)
R. Natali (University of Camerino, Istituto Nazionale di Fisica Nucleare - Sezione di Perugia)
A Borrielli (Fondazione Bruno Kessler)
Gregory Pandraud (TU Delft - Else Kooi Laboratory, TU Delft - EKL Processing)
E. Serra (TU Delft - Electronic Components, Technology and Materials, Trento Institute for Fundamental Physics and Applications, TU Delft - Else Kooi Laboratory)
Giovanni Di Giuseppe (University of Camerino, Istituto Nazionale di Fisica Nucleare - Sezione di Perugia)
David Vitali (University of Camerino, Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche, Istituto Nazionale di Fisica Nucleare - Sezione di Perugia)
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Abstract
We realize a phase-sensitive closed-loop control scheme to engineer the fluctuations of the pump field which drives an optomechanical system and show that the corresponding cooling dynamics can be significantly improved. In particular, operating in the counterintuitive "antisquashing" regime of positive feedback and increased field fluctuations, sideband cooling of a nanomechanical membrane within an optical cavity can be improved by 7.5 dB with respect to the case without feedback. Close to the quantum regime of reduced thermal noise, such feedback-controlled light would allow going well below the quantum backaction cooling limit.