Micromagnet engineering for enhanced addressability of donor-cluster arrays in silicon
Abstract
Phosphorus donors in silicon are one of the promising platforms for fault-tolerant quantum computing, owing to their long coherence times and compatibility with complementary metal-oxide-semiconductor (CMOS) technology. However, a key bottleneck for scaling this platform lies in the independent addressability of individual spin qubits. Here, we present a scalable quantum processor architecture that integrates scanning tunneling microscope (STM)-defined phosphorus donor-cluster arrays with on-chip micromagnets. By generating magnetic field gradients, the micromagnets enable a broader addressable frequency range compared to the addressing scheme based solely on variations in hyperfine (HF) interactions, which arise from the randomness of intra-cluster configurations. Through micromagnetic simulations to optimize micromagnet geometry, we demonstrate that these structures are compatible with customized array designs, facilitating the integration of over 120 atomic spin qubits and enabling frequency multiplexing with a single microwave antenna, which greatly reduces the overhead of fan-out addressing lines. This design is further validated via magnetic measurements, which generally align with our micromagnetic simulations. These results establish a critical foundation for the development of scalable silicon quantum computing with atomic qubits.
Versions
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BibTeX
@misc{wang2026micromagnet,
title = {{Micromagnet engineering for enhanced addressability of donor-cluster arrays in silicon}},
author = {Hao Wang and Baolong Zhao and Shihang Zhang and Ziliang Jin and Huan Shu and Peihao Huang and Guanyong Wang and Mingchao Duan and Tianluo Pan and Tao Xin and Guangchong Hu and Zhen Tian and Dapeng Yu and Yu He},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.04584},
eprint = {2610.04584},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.04584},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Micromagnet engineering for enhanced addressability of donor-cluster arrays in silicon
AU - Hao Wang
AU - Baolong Zhao
AU - Shihang Zhang
AU - Ziliang Jin
AU - Huan Shu
AU - Peihao Huang
AU - Guanyong Wang
AU - Mingchao Duan
AU - Tianluo Pan
AU - Tao Xin
AU - Guangchong Hu
AU - Zhen Tian
AU - Dapeng Yu
AU - Yu He
PY - 2026
DA - 2026/10/03
PB - arXiv
DO - 10.48550/arxiv.2610.04584
UR - https://arxiv.org/abs/2610.04584
AB - Phosphorus donors in silicon are one of the promising platforms for fault-tolerant quantum computing, owing to their long coherence times and compatibility with complementary metal-oxide-semiconductor (CMOS) technology. However, a key bottleneck for scaling this platform lies in the independent addressability of individual spin qubits. Here, we present a scalable quantum processor architecture that integrates scanning tunneling microscope (STM)-defined phosphorus donor-cluster arrays with on-chip micromagnets. By generating magnetic field gradients, the micromagnets enable a broader addressable frequency range compared to the addressing scheme based solely on variations in hyperfine (HF) interactions, which arise from the randomness of intra-cluster configurations. Through micromagnetic simulations to optimize micromagnet geometry, we demonstrate that these structures are compatible with customized array designs, facilitating the integration of over 120 atomic spin qubits and enabling frequency multiplexing with a single microwave antenna, which greatly reduces the overhead of fan-out addressing lines. This design is further validated via magnetic measurements, which generally align with our micromagnetic simulations. These results establish a critical foundation for the development of scalable silicon quantum computing with atomic qubits.
ER -