Silicon Quantum Processors Reach 99.9% Two-Qubit Gate Fidelity in Scalable CMOS Architecture

The quest for practical quantum computing has cleared its most formidable physics obstacle. Researchers have demonstrated 99.9% two-qubit gate fidelity using electron spin qubits confined within silicon quantum dots—manufactured on standard 300mm industrial semiconductor cleanroom tooling.

The Error Correction Milestone

Surpassing 99.9% fidelity is the theoretical prerequisite for surface-code quantum error correction. This confirms that logical qubits can be formed from arrays of physical silicon qubits, opening the door to fault-tolerant quantum simulation of complex molecular catalysts and room-temperature superconductors.