Silicon Quantum Computing
Australian silicon-spin quantum-computing company spun out of Michelle Simmons' group at UNSW Sydney, headquartered on the UNSW Kensington campus inside the ARC Centre of Excellence CQC2T. Distinctive among silicon-spin vendors for STM-lithographed atomic-precision placement of phosphorus donors in silicon (P-in-Si), rather than the CMOS-foundry electrostatic quantum-dot route taken by Diraq, Quantum Motion and Intel. First commercial product is the Quantum Twins analog quantum simulator (launched February 2026 for materials and chemistry), with early customers including Commonwealth Bank, Telstra and the Australian Department of Defence.
Timeline
Current flagship
Quantum Twins — P-in-Si STM-lithographed analog quantum simulator (15,000-register patterned device; 0.13 nm placement precision)
Milestones
- 2026-02Quantum Twins launched — analog quantum simulator for materials and chemistry, with companion Nature paper demonstrating up-to-99.99% qubit fidelity and 0.13 nm atomic placement precision
- 2025-12Multi-qubit multi-register processor results published — qubit quality improves rather than degrades with system scale
- 2025-08Australian Department of Defence purchases SQC's Watermelon quantum-machine-learning processor
- 2025Selected by DARPA for Stage B of the Quantum Benchmarking Initiative
- 2025Grover's-algorithm demonstration reaching 98.87% of the theoretical maximum success probability on silicon spin qubits (Nature Nanotechnology)
- 2024-08AUD$50.4M Series A close at AUD$195.3M post-money valuation — CBA, Telstra, UNSW, Australian Federal Government, NSW Government
- 2022-06Atomic-scale integrated quantum circuit — 10 phosphorus quantum dots placed with sub-nanometre precision in silicon, used as analog simulator of polyacetylene (Nature)
- 2019Three-dimensional atom-by-atom transistor demonstrated in silicon (Nature Nanotechnology)
- 2017-05SQC incorporated as a UNSW spinout with AUD$83M seed backing from UNSW, Telstra, CBA, Australian Federal Government and NSW Government
- 2012Simmons group at UNSW demonstrates a single-atom transistor in silicon (Nature Nanotechnology) — the scientific foundation for SQC's atomic-precision approach
Roadmap
- 2033 Commercial-scale error-corrected silicon quantum computer source ↗
Capability details
Quantum computing
- Qubit type
- spin-si
- Physical qubits
- 10
- Logical qubits
- 0
- 1Q gate fidelity
- 0.9999
- 2Q gate fidelity
- —
- T₁
- —
- T₂
- —
- EC code
- —
- Connectivity
- nearest-neighbour
10 unverified fields
-
modalities.qc.two_q_fidelity -
modalities.qc.coherence_t1_ms -
modalities.qc.coherence_t2_ms -
modalities.qc.ec_code -
modalities.qc.gate_set -
modalities.qc.one_q_fidelity— 99.99% headline from SQC December 2025 / February 2026 announcements; awaiting independent benchmarking -
modalities.qc.physical_qubits_current— 10 reflects the 2022 atomic-scale integrated-circuit demonstrator; the Quantum Twins device patterns 15,000 registers but qubit-count semantics differ for analog simulators -
shareholders— Stake percentages not publicly disclosed; figures shown are dollar contributions at Series A close (August 2024) -
key_personnel.1.since— Segars listed as chairman in public references; exact appointment date not confirmed -
roadmap
People
References
- paper https://www.nature.com/articles/s41586-022-04706-0 Kiczynski et al., Nature 2022 — atomic-scale integrated circuit simulating polyacetylene
- paper https://www.nature.com/articles/s41565-018-0338-1 3D atom-by-atom transistor in silicon (Nature Nanotechnology, 2019)
- paper https://www.nature.com/articles/nnano.2012.21 First single-atom transistor in silicon (Nature Nanotechnology, 2012) — scientific foundation for SQC's STM approach
- paper https://www.nature.com/articles/s41565-024-01853-5 Grover's-algorithm demonstration at 98.87% of theoretical maximum (Nature Nanotechnology, 2025)
- press https://www.sqc.com.au/news/sqc-launches-quantum-twins Quantum Twins product launch (February 2026)
- blog https://www.sqc.com.au/technology SQC technology overview — STM-lithographed P-in-Si