Advanced quantum technologies require scalable and controllable quantum resources^1,2. Gaussian states of multimode light, such as squeezed states and cluster states, are scalable quantum systems^3,4,5, which can be generated on demand. However, non-Gaussian features are indispensable in many quantum protocols, especially to reach a quantum computational advantage⁶. Embodying non-Gaussianity in a multimode quantum state remains a challenge as non-Gaussian operations generally cannot maintain coherence among multiple modes. Here, we generate non-Gaussian quantum states of a multimode light field by removing a single photon in a mode-selective manner from a Gaussian state⁷. To highlight the potential for continuous-variable quantum technologies, we first demonstrated the capability to generate negativity of the Wigner function in a controlled mode. Subsequently, we explored the interplay between non-Gaussianity and quantum entanglement and verify a theoretical prediction⁸ about the propagation of non-Gaussianity along the nodes of photon-subtracted cluster states. Our results demonstrate large-scale non-Gaussianity with great flexibility along with an ensured compatibility with quantum information protocols. This range of features makes our approach ideal to explore the physics of non-Gaussian entanglement^9,10 and to develop quantum protocols, which range across quantum computing^11,12, entanglement distillation¹³ and quantum simulations¹⁴.

先进的量子技术需要可扩展和可控制的量子资源^1,2。多模光的高斯态（例如压缩态和簇态）是可缩放的量子系统^3、4、5，可以按需生成。但是，非高斯特征在许多量子协议中必不可少，尤其是要达到量子计算优势⁶。在非多态量子态中体现非高斯性仍然是一个挑战，因为非高斯操作通常无法保持多个态之间的相干性。在这里，我们通过以模式选择的方式从高斯态^7中去除单个光子来生成多模光场的非高斯量子态⁷。为了突出连续变量量子技术的潜力，我们首先展示了在受控模式下产生维格纳函数负值的能力。随后，我们探索了非高斯性与量子纠缠之间的相互作用，并验证了关于非高斯性沿着光子减去簇状态的节点传播的理论预测⁸。我们的结果证明了大规模非高斯性具有极大的灵活性，并确保了与量子信息协议的兼容性。这一范围的特征使我们的方法成为探索非高斯纠缠的物理^9,10并开发量子协议的理想方法，该协议遍及量子计算^11,12，纠缠蒸馏¹³和量子模拟¹⁴。