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Updated: Jul 12, 2026
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
Published on: June 3, 2015
Eight-qubit operation of a 300 mm SiMOS foundry-fabricated device
Andreas Nickl1, Nard Dumoulin Stuyck2,3, Paul Steinacker2,3
1School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney, NSW, Australia. a.nickl@unsw.edu.au.
Nature Communications
|July 9, 2026
Summary
Researchers demonstrate scalable control of an eight-qubit silicon spin qubit array, a significant step for quantum computing. This advancement shows that silicon spin qubits can be scaled to medium-sized systems while maintaining high coherence.
Area of Science:
- Quantum computing
- Solid-state physics
- Nanotechnology
Background:
- Silicon spin qubits offer high coherence, controllability, and CMOS compatibility, crucial for quantum computing.
- Scalable quantum computing architectures are limited by the number of controllable qubits.
Purpose of the Study:
- To advance scalable quantum computing by demonstrating coherent control of a larger silicon spin qubit system.
- To establish operational scalability beyond the two-qubit regime in silicon spin qubit arrays.
Main Methods:
- Fabrication of an eight-dot linear array of silicon spin qubits using a 300 mm CMOS-compatible foundry process.
- Coherent tuning and characterization of individual qubits and qubit pairs.
- Implementation of a cascaded charge-sensing protocol for high-fidelity readout of central qubits.
- Demonstration of two-qubit gate operations between adjacent qubits.
Main Results:
- Successful tuning and characterization of all eight qubits as four double-dot pairs.
- Achieved Ramsey dephasing times up to 41(2) μs and Hahn-echo coherence times up to 1.31(4) ms.
- Demonstrated high-fidelity readout of the central four qubits.
- Showcased low phase noise two-qubit gate operations between adjacent qubits.
Conclusions:
- Silicon spin qubit arrays can be scaled to medium-sized systems (8 qubits) while preserving system coherence.
- The demonstrated control and coherence establish a pathway towards larger-scale silicon quantum processors.
- CMOS-compatible fabrication enables potential for mass production of quantum computing hardware.
