Coherent feedback in optomechanical systems in the sideband-unresolved regime

Abstract

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.

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Cited by in corpus (7)

• Massive quantum systems as interfaces of quantum mechanics and gravity
• Optical coherent feedback control of a mechanical oscillator
• Active-feedback quantum control of an integrated low-frequency mechanical resonator
• Entanglement engineering of optomechanical systems by reinforcement learning
• Kerr enhanced optomechanical cooling in the unresolved sideband regime
• Coherent feedback control for cavity optomechanical systems with a frequency-dependent mirror
• Unified Collision Model of Coherent and Measurement-based Quantum Feedback