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arXiv · 2509.03243

Isotopically Selected Single Antimony Molecule Doping

Mason Adshead·Maddison Coke·Evan Tillotson·Kexue Li·Sam Sullivan-Allsop·Ricardo Egoavil·William Thornley·Yi Cui·Christopher M Gourlay·Katie L Moore·Sarah J Haigh·Richard J Curry
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Abstract

A reliable route to the deterministic fabrication of impurity ion donors in silicon is required to advance quantum computing architectures based upon such systems. This paper reports the ability to dope isotopically-defined unique (${}^{121}\mathrm{Sb}{}^{123}\mathrm{Sb}$) clusters into silicon with measured detection efficiencies of 94% being obtained. Atomically resolved imaging of the doped clusters reveals a Sb-to-Sb separation of ~2 nm post-implantation, thus indicating suitability to form coupled qudit systems. The method used is fully compatible with integration into processing that includes pre-enrichment of the silicon host to < 3ppm ${}^{29}\mathrm{Si}$ levels. As such, we present a potential pathway to the creation of scaled qudit arrays within silicon platforms for quantum computing.

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Mason Adshead, Maddison Coke, Evan Tillotson, Kexue Li, Sam Sullivan-Allsop, Ricardo Egoavil, William Thornley, Yi Cui, Christopher M Gourlay, Katie L Moore, Sarah J Haigh, Richard J Curry. 2025-09-03. Isotopically Selected Single Antimony Molecule Doping. https://arxiv.org/abs/2509.03243

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