Silicon Quantum Computing

Silicon Quantum Computing
Silicon Quantum Computing Pty Ltd
Company typePrivate
IndustryQuantum Computing
Founded2017
HeadquartersSydney, Australia
Key people
Websitesqc.com.au

Silicon Quantum Computing Pty Ltd (SQC) is a Sydney, Australia-based quantum computing company.

The company develops quantum computers and analogue quantum devices using phosphorus atoms manufactured within silicon[1] using scanning tunnelling microscopes, an approach within the field of spin qubits.

Distinct from other companies within the spin qubits modality, SQC uses the nuclear spin of phosphorus atoms placed[2] within isotopically pure Si-28 wafers for quantum computation. Atoms used as qubits have demonstrated favourable performance indicators such as long coherence times[3] and biased noise.[4]

History

SQC was founded by Michelle Simmons in 2017.[5] She is recognised for her foundational contributions[6] to the field of atomic electronics. The company is chaired by Simon Segars[7] the former Chief Executive Officer (CEO) of ARM Holdings PLC.

At incorporation, the company raised A$83 million from the Australian Federal Government, the New South Wales Government, the University of New South Wales, Telstra and the Commonwealth Bank of Australia.[8]

Technology

SQC uses phosphorus atoms precision-placed within pure silicon (Si-28)[9][1] to create qubits.

Simmons' research group, prior to the incorporation of SQC in 2012, created the first single atom transistor.[10] SQC created the 3D atom transistor in 2019[11] and an integrated circuit made with atomic precision in 2022.[12]

Grover's algorithm is one of the two foundational quantum algorithms (alongside Shor's algorithm). Grover's algorithm runs quadratically faster than the best possible classical algorithm for the same task, a linear search, and so has significant commercial relevance for optimisation problems. In 2025, SQC announced results of running Grover's on one of their quantum computing systems and achieving 98.87%[13] of the theoretical maximum. This result was achieved without error correction.[14]

See also

References

  1. ^ a b Schofield, S. R.; Curson, N. J.; Simmons, M. Y.; Rueß, F. J.; Hallam, T.; Oberbeck, L.; Clark, R. G. (2003-09-25). "Atomically Precise Placement of Single Dopants in Si". Physical Review Letters. 91 (13): 136104. arXiv:cond-mat/0307599. Bibcode:2003PhRvL..91m6104S. doi:10.1103/PhysRevLett.91.136104. PMID 14525322.
  2. ^ Kranz, Ludwik; Gorman, Samuel Keith; Thorgrimsson, Brandur; He, Yu; Keith, Daniel; Keizer, Joris Gerhard; Simmons, Michelle Yvonne (2020). "Exploiting a Single-Crystal Environment to Minimize the Charge Noise on Qubits in Silicon". Advanced Materials. 32 (40): 2003361. doi:10.1002/adma.202003361. ISSN 1521-4095.
  3. ^ Reiner, J.; Chung, Y.; Misha, S. H.; Lehner, C.; Moehle, C.; Poulos, D.; Monir, S.; Charde, K. J.; Macha, P.; Kranz, L.; Thorvaldson, I.; Thorgrimsson, B.; Keith, D.; Hsueh, Y. L.; Rahman, R. (2024). "High-fidelity initialization and control of electron and nuclear spins in a four-qubit register". Nature Nanotechnology. 19 (5): 605–611. doi:10.1038/s41565-023-01596-9. ISSN 1748-3395.
  4. ^ Kranz, Ludwik; Gorman, Samuel Keith; Thorgrimsson, Brandur; He, Yu; Keith, Daniel; Keizer, Joris Gerhard; Simmons, Michelle Yvonne (2020). "Exploiting a Single-Crystal Environment to Minimize the Charge Noise on Qubits in Silicon". Advanced Materials. 32 (40): 2003361. doi:10.1002/adma.202003361. ISSN 1521-4095.
  5. ^ "Australia gets quantum computing company". Information Age. Retrieved 2025-06-09.
  6. ^ Dargan, James (2023-10-19). "Michelle Simmons, 2018 Australian of the Year, Wins PM's Top Science Prize for Pioneering Quantum Computing in Atomic Electronics". The Quantum Insider. Retrieved 2025-06-09.
  7. ^ "Fellow Detail Page | Royal Society". royalsociety.org. Retrieved 2025-06-09.
  8. ^ "UNSW joins with government and business to keep quantum computing technology in Australia". Australian Financial Review. 2017-08-22. Retrieved 2025-06-09.
  9. ^ "Silex and Silicon Quantum Computing Launch Silicon Enrichment Project for Quantum Computing". HPCwire. Retrieved 2025-06-09.
  10. ^ Fuechsle, Martin; Miwa, Jill A.; Mahapatra, Suddhasatta; Ryu, Hoon; Lee, Sunhee; Warschkow, Oliver; Hollenberg, Lloyd C. L.; Klimeck, Gerhard; Simmons, Michelle Y. (2012-02-19). "A single-atom transistor". Nature Nanotechnology. 7 (4): 242–246. Bibcode:2012NatNa...7..242F. doi:10.1038/nnano.2012.21. ISSN 1748-3395. PMID 22343383.
  11. ^ Koch, Matthias; Keizer, Joris G.; Pakkiam, Prasanna; Keith, Daniel; House, Matthew G.; Peretz, Eldad; Simmons, Michelle Y. (2019-01-07). "Spin read-out in atomic qubits in an all-epitaxial three-dimensional transistor". Nature Nanotechnology. 14 (2): 137–140. Bibcode:2019NatNa..14..137K. doi:10.1038/s41565-018-0338-1. hdl:1959.4/unsworks_63403. ISSN 1748-3395. PMID 30617309.
  12. ^ Kiczynski, M.; Gorman, S. K.; Geng, H.; Donnelly, M. B.; Chung, Y.; He, Y.; Keizer, J. G.; Simmons, M. Y. (2022-06-22). "Engineering topological states in atom-based semiconductor quantum dots". Nature. 606 (7915): 694–699. Bibcode:2022Natur.606..694K. doi:10.1038/s41586-022-04706-0. ISSN 1476-4687. PMC 9217742. PMID 35732762.
  13. ^ Thorvaldson, I.; Poulos, D.; Moehle, C. M.; Misha, S. H.; Edlbauer, H.; Reiner, J.; Geng, H.; Voisin, B.; Jones, M. T.; Donnelly, M. B.; Peña, L. F.; Hill, C. D.; Myers, C. R.; Keizer, J. G.; Chung, Y. (2025-02-20). "Grover's algorithm in a four-qubit silicon processor above the fault-tolerant threshold". Nature Nanotechnology. 20 (4): 472–477. doi:10.1038/s41565-024-01853-5. ISSN 1748-3395. PMC 12014505.
  14. ^ Abdel-Kareem, Mohamed (2025-02-22). "Silicon Quantum Computing Demonstrates 98.9% Accuracy in Grover's Algorithm Execution Using Qubits with Phosphorus Atoms Placed into Silicon". Quantum Computing Report. Retrieved 2025-06-25.
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