In-plane optimal qubit operation with control fidelities exceeding 99 %
Abstract
Hole spin qubits based on semiconductor quantum dots are promising for building future large-scale quantum computers owing to their all-electrical manipulation. However, abundant physical mechanisms of valence band holes lead to anisotropic qubit properties. There is an opportunity to prolong the coherence time and achieve high-fidelity qubit manipulations. Here, we report a single-hole spin qubit in a planar germanium quantum dot and investigate its anisotropic susceptibility to charge noise under an in-plane magnetic field. By correlating the longitudinal spin-electric susceptibility with qubit coherence and control performance, we identify an optimal operating point where the sensitivity to charge noise is minimized. We find that optimizing the magnetic-field orientation reduces the spin-electric susceptibility, resulting in a five-fold enhancement of the Hahn-echo coherence time and a nearly tenfold suppression of control infidelity. At the optimal operating point, gate set tomography demonstrates the maximum gate fidelity of 99.82 %. Our finding enhances the prospects of hole spin qubits for scalable quantum information processing.
Versions
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BibTeX
@misc{zhou2026inplane,
title = {{In-plane optimal qubit operation with control fidelities exceeding 99 %}},
author = {Yu-Chen Zhou and Zhenzhen Kong and Rong-Long Ma and Hao-Tian Jiang and Ao-Ran Li and Yang Zhong and Zhi-Tao Wu and Rui Zheng and Gui-Lei Wang and Gang Cao and Hai-Ou Li and Guo-Ping Guo},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.33229},
eprint = {2609.33229},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.33229},
}
RIS
TY - UNPB
TI - In-plane optimal qubit operation with control fidelities exceeding 99 %
AU - Yu-Chen Zhou
AU - Zhenzhen Kong
AU - Rong-Long Ma
AU - Hao-Tian Jiang
AU - Ao-Ran Li
AU - Yang Zhong
AU - Zhi-Tao Wu
AU - Rui Zheng
AU - Gui-Lei Wang
AU - Gang Cao
AU - Hai-Ou Li
AU - Guo-Ping Guo
PY - 2026
DA - 2026/09/27
PB - arXiv
DO - 10.48550/arxiv.2609.33229
UR - https://arxiv.org/abs/2609.33229
AB - Hole spin qubits based on semiconductor quantum dots are promising for building future large-scale quantum computers owing to their all-electrical manipulation. However, abundant physical mechanisms of valence band holes lead to anisotropic qubit properties. There is an opportunity to prolong the coherence time and achieve high-fidelity qubit manipulations. Here, we report a single-hole spin qubit in a planar germanium quantum dot and investigate its anisotropic susceptibility to charge noise under an in-plane magnetic field. By correlating the longitudinal spin-electric susceptibility with qubit coherence and control performance, we identify an optimal operating point where the sensitivity to charge noise is minimized. We find that optimizing the magnetic-field orientation reduces the spin-electric susceptibility, resulting in a five-fold enhancement of the Hahn-echo coherence time and a nearly tenfold suppression of control infidelity. At the optimal operating point, gate set tomography demonstrates the maximum gate fidelity of 99.82 %. Our finding enhances the prospects of hole spin qubits for scalable quantum information processing.
ER -