Spin Qubits

Qubits encoded in the spin of a single electron or nucleus — compact, silicon-compatible, and also cryogenic.

In brief

• Encode information in electron/nuclear spin in quantum dots or donors.
• Silicon-CMOS compatible — a manufacturing advantage.
• Long coherence in isotopically purified silicon.
• Still operate at sub-kelvin temperatures — dilution-fridge territory.

The detail

Spin qubits promise dense, foundry-compatible quantum processors. Isotopically enriched silicon-28 removes magnetic nuclear noise, extending coherence. Like superconducting qubits, they run cold — reinforcing that helium-3 cooling underpins multiple competing hardware paths, not just one.