China takes a decisive step towards quantum autonomy with ultrapure silicon

The global race for quantum supremacy has taken a crucial strategic turn. In an official announcement in June 2026, nuclear research institutes in China have confirmed the successful production, for the first time on an industrial scale, of ultrapure silicon-28 with a concentration exceeding purity standards of 99.99%.

This development, led by the Nuclear Industry Physical and Chemical Engineering Research Institute of China National Nuclear Corporation (CNNC), represents the elimination of one of the most significant material "bottlenecks" in the manufacture of domestic quantum hardware.

Silicon-28: A magnetic oasis for qubits

Semiconductor-based solid-state quantum computing uses individual electrons trapped in microscopic silicon structures to act as qubits. However, nature presents an invisible obstacle: natural silicon is composed of several isotopes, including silicon-29.

The core of silicon-29 has a magnetic spin that acts like a tiny unstable magnet. This residual magnetic activity interacts with the processor's qubits, inducing "noise" and rapidly destroying quantum coherence (the superposition state necessary for massive calculations).

Purification of the isotope silicon-28, which has a nuclear spin of zero, creates a quantum "silent" substrate. In this purified environment, spin qubits can maintain coherence for significantly longer periods, dramatically reducing the error rate and facilitating the manipulation of large-scale qubit arrays.

Silicio Natural (Ruidoso)                Silicio-28 Purificado (Silencioso)
┌─────────────────────────────────┐      ┌─────────────────────────────────┐
│ • Contiene silicio-29           │      │ • Libre de silicio-29           │
│ • Espín nuclear magnético activo│  VS  │ • Espín nuclear de cero         │
│ • Rápida pérdida de coherencia  │      │ • Coherencia prolongada         │
│ • Alta tasa de error en qubits  │      │ • Ideal para qubits estables    │
└─────────────────────────────────┘      └─────────────────────────────────┘

Breaking external dependency

To date, the global supply chain for isotopically pure silicon was dominated by select laboratories, with strong roots in Russia (inheritor of Soviet-era centrifuge technology) and highly restricted facilities in Europe and the United States.

The trade blockade and growing geopolitical tensions had Beijing fearing a complete disconnection from the supply of quantum-grade stable isotopes. With this advance in isotopic enrichment technology, China not only secures its line of quantum research, but also consolidates its position to build completely domestic commercial-grade silicon spin quantum processors.

This milestone paves the way for domestic quantum platforms, such as the Origin Wukong superconducting series, to make the leap towards silicon-based architectures, benefiting from existing traditional semiconductor production lines.

Frequently Asked Questions (FAQ)

What is ultrapure silicon (silicon-28)?

It is an isotope of silicon that has been purified to remove traces of other unstable isotopes such as silicon-29. This gives it a nuclear structure free of magnetic nuclear spin, ideal for housing qubits.

Why is silicon-28 crucial for quantum computing?

Natural silicon generates magnetic interference that destroys the quantum coherence of qubits. Silicon-28 creates a magnetic 'zero noise' environment, dramatically extending the lifetime of the qubits and reducing processing errors.

What does this advance mean for China's technological sovereignty?

Until now, global production of silicon-28 depended almost entirely on Russia and European infrastructure. Producing it domestically ensures that China can manufacture its own quantum processors at scale without fear of trade blockades.