Optimal control for feedback cooling in cavityless levitated optomechanics

Ferialdi, L., Setter, A., Toroš, M. , Timberlake, C. and Ulbricht, H. (2019) Optimal control for feedback cooling in cavityless levitated optomechanics. New Journal of Physics, 21(7), 073019. (doi: 10.1088/1367-2630/ab2b69)

[img] Text
251567.pdf - Published Version
Available under License Creative Commons Attribution.

2MB

Abstract

We consider feedback cooling in a cavityless levitated optomechanics setup, and we investigate the possibility to improve the feedback implementation. We apply optimal control theory to derive the optimal feedback signal both for quadratic (parametric) and linear (electric) feedback. We numerically compare optimal feedback against the typical feedback implementation used for experiments. In order to do so, we implement a state estimation scheme that takes into account the modulation of the laser intensity. We show that such an implementation allows us to increase the feedback strength, leading to faster cooling rates and lower center-of-mass temperatures.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Toros, Dr Marko
Authors: Ferialdi, L., Setter, A., Toroš, M., Timberlake, C., and Ulbricht, H.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:New Journal of Physics
Publisher:IOP Publishing
ISSN:1367-2630
ISSN (Online):1367-2630
Published Online:03 July 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in New Journal of Physics 21(7): 073019
Publisher Policy:Reproduced under a Creative Commons License

University Staff: Request a correction | Enlighten Editors: Update this record