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arXiv:2006.02455 · Physical Review Research

Entanglement dynamics in dispersive optomechanics: Nonclassicality and revival

Igor Brandão, Bruno B. Suassuna, Bruno Melo, Thiago Guerreiro

Published Dec 28, 2020• 12 citations
arXivHTMLPDF

Abstract

We study entanglement dynamics in a dispersive optomechanical system consisting of two optical modes and a mechanical oscillator inside an optical cavity.The two optical modes interact with the mechanical oscillator, but not directly with each other.The appearance of optical entanglement witnesses nonclassicality of the oscillator.We study the dependence of the entanglement dynamics on the optomechanical coupling, the mean photon number in the cavity, and the oscillator temperature.An experimental realization with ultracold atomic ensembles is proposed.

DOI
10.1103/physrevresearch.2.043421

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Stationary entanglement between the motion of macroscopic objects and light is a long-standing goal of quantum optomechanics, with implications for both fundamental tests of quantum physics and emerging quantum technologies. We report the generation of quantum entanglement between the center-of-mass motion of a nanosphere levitated in an optical tweezer inside an optical cavity and the electromagnetic field. By heterodyne detection, we reconstruct the full set of optomechanical correlations and observe a violation of separability bounds between the mechanical motion and the quadratures of a propagating optical mode. This demonstrates the distribution of nonclassical correlations beyond the interaction region. The entanglement is generated at room temperature and remains robust over a broad range of parameters. Our results establish levitated optomechanical systems as a promising platform for continuous-variable quantum communication and for tests of macroscopic quantum physics.