Decoherence-protected entangling gates in a silicon carbide quantum node
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866912872006680576 |
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| author | Ren, Shuo Liang, Rui-Jian He, Zhen-Xuan Zhou, Ji-Yang Lin, Wu-Xi Hao, Zhi-He Chen, Bing Tu, Tao Xu, Jin-Shi Li, Chuan-Feng Guo, Guang-Can |
| author_facet | Ren, Shuo Liang, Rui-Jian He, Zhen-Xuan Zhou, Ji-Yang Lin, Wu-Xi Hao, Zhi-He Chen, Bing Tu, Tao Xu, Jin-Shi Li, Chuan-Feng Guo, Guang-Can |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_03296 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Decoherence-protected entangling gates in a silicon carbide quantum node Ren, Shuo Liang, Rui-Jian He, Zhen-Xuan Zhou, Ji-Yang Lin, Wu-Xi Hao, Zhi-He Chen, Bing Tu, Tao Xu, Jin-Shi Li, Chuan-Feng Guo, Guang-Can Quantum Physics 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. |
| title | Decoherence-protected entangling gates in a silicon carbide quantum node |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2602.03296 |