Scalable Atomic Arrays for Spin‐Based Quantum Computers in Silicon
Semiconductor spin qubits combine excellent quantum performance with the prospect of manufacturing quantum devices using industry-standard metal-oxide-semiconductor (MOS) processes. This applies also to ion-implanted donor spins, which further afford exceptional coherence times and large Hilbert space dimension in their nuclear spin. Here multiple strategies are demonstrated and integrated to manufacture scale-up donor-based quantum computers. <sup>31</sup>PF<sub>2</sub> molecule implants are used to triple the placement certainty compared to <sup>31</sup>P ions, while attaining 99.99% confidence in detecting the implant. Similar confidence is retained by implanting heavier atoms such as <sup>123</sup>Sb and <sup>209</sup>Bi, which represent high-dimensional qudits for quantum information processing, while Sb<sub>2</sub> molecules enable deterministic formation of closely-spaced qudits. The deterministic formation of regular arrays of donor atoms with 300 nm spacing is demonstrated, using step-and-repeat implantation through a nano aperture. These methods cover the full gamut of technological requirements for the construction of donor-based quantum computers in silicon.
Authors
- David N. Jamieson (ORCID: https://orcid.org/0000-0001-7733-6715)
- Hannes R. Firgau (ORCID: https://orcid.org/0000-0002-9655-6227)
- Edwin Mayes (ORCID: https://orcid.org/0000-0001-6668-444X)
- Alexander Jakob (ORCID: https://orcid.org/0000-0002-2794-404X)
- Simon G. Robson (ORCID: https://orcid.org/0000-0003-0059-9108)
- D.R. Holmes (ORCID: https://orcid.org/0000-0001-7040-5538)
- Andrea Morello (ORCID: https://orcid.org/0000-0001-7445-699X)
- Jeffrey C. McCallum (ORCID: https://orcid.org/0000-0002-6692-7728)
- D. Spemann (ORCID: https://orcid.org/0000-0002-5646-1389)
- Vincent Mourik (ORCID: https://orcid.org/0000-0003-1522-7403)
- M. Posselt (ORCID: https://orcid.org/0000-0002-8218-5744)
- Vivien Schmitt
Institutions
- University of Technology Sydney (AU)
- The University of Melbourne (AU)
- Helmholtz-Zentrum Dresden-Rossendorf (DE)
- UNSW Sydney (AU)
- Centre for Quantum Computation and Communication Technology (AU)
- Leibniz Institute of Surface Engineering (DE)
- RMIT University (AU)
Publication Details
- Journal
- Advanced Materials
- Published
- 2024-08-29
- DOI
- https://doi.org/10.1002/adma.202405006
- Citations
- 10
- Primary Topic
- Quantum and electron transport phenomena
- Type
- article
- Field-Weighted Citation Impact
- 3.38
Funders
- University of Melbourne
- Centre of Excellence for Quantum Computation and Communication Technology, Australian Research Council
- Army Research Office