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标题: "Assessing fidelity-limiting factors and achieving single-qubit gate fidelity beyond 99.999% in driven silicon spin qubits"
原文链接: "https://arxiv.org/abs/2608.11072"
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---

## Condensed Matter > Mesoscale and Nanoscale Physics

## Title:Assessing fidelity-limiting factors and achieving single-qubit gate fidelity beyond 99.999% in driven silicon spin qubits

[View PDF](https://arxiv.org/pdf/2608.11072)

> Abstract:In semiconductor single-spin qubits, high-fidelity quantum gates have been demonstrated; however, achieving consistent performance remains challenging due to variations in driven qubit coherence, which is less explored than free-evolution coherence such as $T_2^*$. Here, we report single-qubit gate fidelities above 99.999%, achieved by dramatically extending the driven-spin coherence time and suppressing off-resonant driving effects that are detrimental to accurate fidelity benchmarking. We demonstrate that removing proximal reservoirs significantly enhances the spin-locking coherence time ($T_{1\rho}$), a critical metric for qubits under microwave driving. Furthermore, we reveal that in typical spin qubit setups using parity readout and rectangular pulses, off-resonant excitation of neighboring qubits causes substantial benchmarking artifacts. By optimizing device conditions to mitigate microwave-induced degradation and implementing spectrally tailored pulse shaping, we achieve a ${\pi}/2$ gate fidelity of 99.99920(2)%, with remaining errors primarily limited by incoherent noise. These results showcase the mechanisms that bound fidelity benchmarking in state-of-the-art silicon spin qubits and provide practical guidelines for achieving and verifying high fidelities in these systems.

| Subjects: | Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Quantum Physics (quant-ph) |
| --- | --- |
| Cite as: | [arXiv:2608.11072](https://arxiv.org/abs/2608.11072) \[cond-mat.mes-hall\] |
|  | (or [arXiv:2608.11072v1](https://arxiv.org/abs/2608.11072v1) \[cond-mat.mes-hall\] for this version) |
|  | [https://doi.org/10.48550/arXiv.2608.11072](https://doi.org/10.48550/arXiv.2608.11072) |

## Submission history

From: Kenta Takeda \[[view email](https://arxiv.org/show-email/86aa0d61/2608.11072)\]  
**\[v1\]** Tue, 11 Aug 2026 15:35:54 UTC (6,135 KB)

[Which authors of this paper are endorsers?](https://arxiv.org/auth/show-endorsers/2608.11072) | Disable MathJax ([What is MathJax?](https://info.arxiv.org/help/mathjax.html))
