Solid-state color centers are promising candidates for nodes in quantum network architectures. However, realizing scalable and fully functional quantum nodes, comprising both processor and memory qubits with high-fidelity universal gate operations, remains a central challenge in this field. Here, we demonstrate a fully functional quantum node in silicon carbide, where electron spins act as quantum processors and nuclear spins serve as quantum memory. Specifically, we design a pulse sequence that combines dynamical decoupling with hyperfine interactions to realize decoherence-protected universal gate operations between the processor and memory qubits. Leveraging this gate, we deterministically prepare entangled states within the quantum node, achieving a fidelity of 90%, which exceeds the fault-tolerance threshold of certain quantum network architectures. These results open a pathway toward scalable and fully functional quantum nodes based on silicon carbide.
@article{arxiv.2602.03296,
title = {Decoherence-protected entangling gates in a silicon carbide quantum node},
author = {Shuo Ren and Rui-Jian Liang and Zhen-Xuan He and Ji-Yang Zhou and Wu-Xi Lin and Zhi-He Hao and Bing Chen and Tao Tu and Jin-Shi Xu and Chuan-Feng Li and Guang-Can Guo},
journal= {arXiv preprint arXiv:2602.03296},
year = {2026}
}