科学家首次成功利用太阳光直接生成量子纠缠，突破了传统上需要激光才能产生纠缠的认知。[1]加拿大渥太华大学与德国马克斯普朗克光学所的研究团队在室外实验中，使用菲涅尔透镜（约家用窗口大小）将阳光聚焦到直径如人发粗细的光纤中，进而照射到直径约1毫米的非线性晶体上，通过自发参数下转换技术成功产生了纠缠光子。[1]该实验产生的纠缠光子与理想纠缠态的相似度达到94%，并验证了光子相关性违反了贝尔不等式。[1]
这项研究由加拿大渥太华大学的Cheng Li担任论文第一作者，理论基础来自Robert Boyd团队，实验设备由Hanieh Fattahi团队在德国马克斯普朗克光学所开发。[1]相关论文已发表在《Optica》期刊2026年第13卷第8期。[1]
Researchers have successfully generated quantum entanglement directly from sunlight, overturning the conventional requirement for lasers in producing such states.[1] Using a Fresnel lens concentrator roughly the size of a household window, scientists focused sunlight onto a nonlinear crystal about one millimeter in size to achieve entangled photon pairs with a similarity of approximately 94% to the ideal entangled state.[1] The experiment employed spontaneous parametric down-conversion (SPDC) technology, with the concentrated light directed through an optical fiber as thin as a human hair.[1]
The work, conducted at the Max Planck Institute for Optics in Germany on August 7, 2026, represents a collaboration between Robert Boyd's team at the University of Ottawa and Hanieh Fattahi's team at the institute.[1] The researchers verified that the photon correlations violated Bell's inequality, confirming the quantum nature of the generated entanglement.[1] Cheng Li from the University of Ottawa led the research, with findings published in Optica, Volume 13, Issue 8, page 1508.[1]