Equal1 Validates CMOS-Compatible Silicon Spin Qubit Platform Using GlobalFoundries' 22FDX Process

quantumcomputingreport.com, Apr. 16, 2025 – 

Equal1 has achieved a key milestone in silicon-based quantum computing by validating the formation of multiple tunable quantum dots using a commercial CMOS process based on GlobalFoundries’ 22FDX® FD-SOI platform. The demonstration marks the first time a commercial foundry process has been used to form tunnel-coupled quantum-dot arrays, establishing a foundation for scalable spin qubit architectures. Equal1’s monolithic chip integrates 29 NMOS and PMOS quantum cells and has demonstrated robust operational stability across cryogenic temperatures ranging from 70 mK to 1.2 K.

The technology transforms multi-gate transistors into linear quantum-dot arrays with integrated charge sensors, enabling scalable spin qubit development using industry-standard CMOS workflows. Equal1’s approach leverages the same manufacturing infrastructure used for classical system-on-chip (SoC) electronics, providing a path toward seamless integration between classical and quantum systems. This commercial compatibility addresses key barriers to scale, including reproducibility, fabrication cost, and electronic co-integration.

By aligning quantum device design with existing semiconductor platforms, Equal1 is contributing to the broader shift toward Quantum 2.0 — the development of practical, scalable quantum systems built on mature industrial processes. The company’s latest work builds on prior demonstrations of quantum dot-electronic integration and reinforces the strategic viability of silicon spin qubits for large-scale quantum computing deployments.

Read the full announcement from Equal1 here, with related research papers available on nanoscale single-electron boxes here, quantum dot-electronics integration here, quantum device fabrication here, quantum dots and charge sensing here, and common-mode control in CMOS processes here.

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