Coherent feedback in optomechanical systems in the sideband-unresolved regime

Jingkun Guo, Simon Gröblacher*

*Corresponding author for this work

Research output: Working paper/PreprintPreprintScientific

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Preparing macroscopic mechanical resonators close to their motional quantum groundstate and generating entanglement with light offers great opportunities in studying fundamental physics and in developing a new generation of quantum applications. Here we propose an experimentally interesting scheme, which is particularly well suited for systems in the sideband-unresolved regime, based on coherent feedback with linear, passive optical components to achieve groundstate cooling and photon-phonon entanglement generation with optomechanical devices. We find that, by introducing an additional passive element – either a narrow linewidth cavity or a mirror with a delay line – an optomechanical system in the deeply sideband-unresolved regime will exhibit dynamics similar to one that is sideband-resolved. With this new approach, the experimental realization of groundstate cooling and optomechanical entanglement is well within reach of current integrated state-of-the-art high-Q mechanical resonators.

Original languageEnglish
Number of pages20
Publication statusPublished - 2022

Publication series

PublisherVerein zur Forderung des Open Access Publizierens in den Quantenwissenschaften
ISSN (Print)2521-327X


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