About
Silicon Quantum Computing (SQC) is a quantum computing company co-founded by CSIRO and UNSW Sydney. It holds the world record for two-qubit gate fidelity at 99.99%, matching IonQ's trapped-ion record, achieved using phosphorus-in-silicon atom qubits, also known as donor qubits. The company's approach places individual phosphorus atoms with atomic precision using an STM tip, then encapsulates them in silicon to create stable qubits with long coherence times. SQC is based in Sydney, Australia. Founded in 2017 with initial funding from UNSW, Commonwealth Bank, Telstra, and the Australian government, SQC developed a 10-qubit processor in 2022 and published landmark quantum simulation results in 2023. In February 2025 it demonstrated Grover's search algorithm at 98.9% of the theoretical maximum, published in Nature Nanotechnology. In November 2025, SQC patterned 250,000 qubit registers in 8 hours using industrial-scale CMOS tools, demonstrating manufacturing scalability, and launched the Quantum Twins simulator with 15,000 qubit registers patterned on silicon, published in Nature. The same month, SQC partnered with SkyWater Technology, a US semiconductor foundry, to advance hybrid computing by combining SQC's quantum device engineering with SkyWater's high-volume US CMOS manufacturing. In January 2026, SQC partnered with Intel and Argonne National Laboratory to deploy 12-qubit quantum dot processors for benchmarking. In December 2025, SQC achieved 99.99% two-qubit gate fidelity, published in Nature, with the unusual property that qubit quality improves as qubit count increases. Commercial deployments include a system for Telstra that reduced machine learning training time and a rack-mounted system for Australian Defence. SQC reached Stage B of DARPA's Quantum Benchmarking Initiative, one of only 11 companies worldwide at this level. In June 2026, SQC and Telstra demonstrated Watermelon, a quantum reservoir computing system that trained in days and matched deep learnin
Quantum Specifications
| Qubit Technology | Silicon-atom |
| Physical Qubits | 10 |
| 2Q Gate Fidelity | 99.99% |
| Error Correction | In-development |
| Quantum Focus | hardware |
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