Quantum entanglement is a fundamental phenomenon that, on the one hand, reveals deep connections between quantum mechanics, gravity and spacetime^1,2, and on the other hand, has practical applications as a key resource in quantum information processing³. Although it is routinely achieved in photon–atom ensembles⁴, entanglement involving solid-state^5,6,7 or macroscopic objects⁸ remains challenging albeit promising for both fundamental physics and technological applications. Here, we report entanglement between collective, chiral vibrations in a two-dimensional WSe₂ host—chiral phonons (CPs)—and single-photons emitted from quantum dots^{9,10,11,12,13} (QDs) present in it. CPs that carry angular momentum were recently observed in WSe₂ and are a distinguishing feature of the underlying honeycomb lattice^14,15. The entanglement results from a ‘which-way’ scattering process, involving an optical excitation in a QD and doubly-degenerate CPs, which takes place via two indistinguishable paths. Our unveiling of entanglement involving a macroscopic, collective excitation together with strong interactions between CPs and QDs in two-dimensional materials opens up ways for phonon-driven entanglement of QDs and engineering chiral or non-reciprocal interactions at the single-photon level.

量子纠缠是一种基本现象，一方面揭示了量子力学，引力和时空^1,2之间的深层联系，另一方面却具有实际应用作为量子信息处理中的关键资源³。尽管它通常是在光子-原子集合体^{4中实现的}，但是涉及固态^5,6,7或宏观物体^8的纠缠仍然具有挑战性，尽管对基础物理和技术应用都有希望。在这里，我们报告了二维WSe ₂宿主（手性声子（CP））与从量子点^{9,10,11,12,13}发出的单光子之间的集体手征振动之间的纠缠（QD）。CPs携带角动量是最近在WSe _2中观察到的，并且是下面的蜂窝格^14,15的显着特征。纠缠是由“双向”散射过程引起的，该过程涉及QD和双简并CP的光学激发，这是通过两条无法区分的路径发生的。我们揭露的纠缠涉及宏观的集体激发以及二维材料中CP和QD之间的强相互作用，为声子驱动的QD纠缠以及单光子级的工程手性或非互易相互作用开辟了道路。