碳化硅量子节点中纠缠的室温存储
Room-Temperature Storage of Entanglement in a Silicon Carbide Quantum Node
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中文总结 AI 辅助
该研究在碳化硅量子节点中实现室温纠缠存储，通过SWAP门将电子-核纠缠转移到核自旋存储器，保真度达92.5%，寿命延长240倍，为室温量子技术提供平台。
中文摘要 AI 辅助
室温下的鲁棒纠缠是固态量子信息处理和量子增强传感的核心挑战。在这里，我们通过将电子-核纠缠态相干转移到长寿命核自旋存储量子比特上，展示了在碳化硅（SiC）量子节点中室温存储纠缠的能力。利用4H-SiC中浅层单色心（通常记为PL6），我们实现了一个完全可寻址的三量子比特寄存器，由一个电子自旋处理器和两个强耦合的$^{29}$Si核自旋存储量子比特组成。该平台能够确定性生成高保真纠缠态，包括保真度为$94 \pm 2\\%$的核自旋贝尔态和保真度为$89 \pm 4\\%$的三量子比特Greenberger-Horne-Zeilinger（GHZ）型态。通过在强超精细耦合体系中实现SWAP门协议，电子-核纠缠以$92.5 \pm 2.5\\%$的保真度转移到核自旋存储器，将纠缠寿命延长了240倍。我们进一步在另一个异质$^{29}$Si-$^{13}$C核自旋寄存器中证实了该方法的普适性，并通过200个单PL6色心的统计调查，表明多核自旋寄存器以超过10%的概率自然出现。这些结果将浅层SiC色心定位为纠缠辅助量子传感和可扩展室温量子技术的强大平台。
英文摘要
Robust entanglement at room temperature is a central challenge for solid-state quantum information processing and quantum-enhanced sensing. Here we demonstrate room-temperature storage of entanglement in a silicon carbide (SiC) quantum node by coherently transferring an electron-nuclear entangled state onto long-lived nuclear-spin memory qubits. Using a shallow single color center in 4H-SiC, conventionally denoted PL6, we realize a fully addressable three-qubit register composed of one electron-spin processor and two strongly coupled $^{29}$Si nuclear-spin memory qubits. This platform enables the deterministic generation of high-fidelity entangled states, including a nuclear-spin Bell state with a fidelity of $94 \pm 2\%$ and a three-qubit Greenberger-Horne-Zeilinger (GHZ)-type state with a fidelity of $89 \pm 4\%$. By implementing a SWAP-gate protocol in the strong hyperfine-coupling regime, the electron-nuclear entanglement is transferred to the nuclear-spin memory with a fidelity of $92.5 \pm 2.5\%$, extending the entanglement lifetime by a factor of 240. We further confirm the generality of this approach in an additional heterogeneous $^{29}$Si-$^{13}$C nuclear-spin register and, through a statistical survey of 200 single PL6 centers, show that multi-nuclear-spin registers occur naturally with probabilities above 10%. These results position shallow SiC color centers as a powerful platform for entanglement-assisted quantum sensing and scalable room-temperature quantum technologies.
发表机构
- University of Science and Technology of China（中国科学技术大学）
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