Silicon Quantum Computing

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

Silicon Quantum Computing

Trade name	Silicon Quantum Computing Pty Ltd
Company type	Private
Industry	Quantum Computing
Founded	2017
Headquarters	Sydney, Australia
Key people	Michelle Simmons (CEO) Simon Segars (Chairman)
Website	sqc.com.au

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.

History

SQC was founded by Michelle Simmons in 2017.^[2] She is recognised for her foundational contributions^[3] to the field of atomic electronics. The company is chaired by Simon Segars^[4] 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.^[5]

Technology

SQC uses phosphorus atoms precision-placed within pure silicon (Si-28)^[6][1] to create qubits.

Simmons' research group, prior to the incorporation of SQC in 2012, created the first single atom transistor.^[7] SQC created the 3D atom transistor in 2019^[8] and an integrated circuit made with atomic precision in 2022.^[9]

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%^[10] of the theoretical maximum. This result was achieved without error correction.^[11]

See also

• Quantum computing
• Cloud-based quantum computing