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yexuqing新虫 (文学泰斗)
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Stationary entanglement of a levitated oscillator with an optical field
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Stationary entanglement of a levitated oscillator with an optical field 悬浮振子与光场的稳态纠缠 ▲ 作者：Q. DEPLANO, A. PONTIN, F. MARINO, AND F. MARIN ▲ 链接： https://www.science.org/doi/10.1126/science.aeh1375 ▲ 摘要： 宏观物体运动与光之间形成稳态纠缠，一直是量子光力学领域的长期研究目标，对量子物理基础检验以及新兴量子技术都具有重要意义。研究者报告了在光腔光镊中悬浮纳米球，实现该纳米球质心运动与电磁场之间的量子纠缠。 利用外差探测技术，研究重构出全部光力学关联，观测到机械运动与传播光模之间可分性界限被打破，证明非经典关联可以分布到相互作用区域之外。该纠缠在室温条件下即可产生，并且在很宽的参数范围内都能稳定保持。 这一结果表明，悬浮光力学系统可作为连续变量量子通信平台，也适用于宏观量子物理相关实验检验。 ▲ Abstract： 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. Using heterodyne detection, we reconstructed the full set of optomechanical correlations and observed a violation of separability bounds between the mechanical motion and a propagating optical mode, demonstrating the distribution of nonclassical correlations beyond the interaction region. The entanglement was generated at room temperature and remained robust over a broad range of parameters. Our results establish levitated optomechanical systems as a platform for continuous-variable quantum communication and for tests of macroscopic quantum physics. |
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