Decoherence-protected entangling gates in a silicon carbide quantum node

• URL: http://arxiv.org/abs/2602.03296v1
• Date: Tue, 03 Feb 2026 09:22:49 GMT
• Title: Decoherence-protected entangling gates in a silicon carbide quantum node
• Authors: Shuo Ren, Rui-Jian Liang, Zhen-Xuan He, Ji-Yang Zhou, Wu-Xi Lin, Zhi-He Hao, Bing Chen, Tao Tu, Jin-Shi Xu, Chuan-Feng Li, Guang-Can Guo,
• Abstract summary: We demonstrate a fully functional quantum node in silicon carbide, where electron spins act as quantum processors and nuclear spins serve as quantum memory.<n>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.
• Score: 4.217021334833737
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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