Quantinuum and RIKEN report breakthroughs in quantum computing error reduction

Quantinuum has announced a significant milestone in quantum computing reliability, reporting that its Helios computer achieved 99.9995% logical fidelity. This result represents approximately five errors per million quantum operations. A key advantage of this architecture is its efficiency in overhead; Quantinuum estimates it requires roughly 30,000 physical qubits to maintain 100 reliable logical qubits, a figure significantly lower than the 900,000 physical qubits estimated for comparable superconducting approaches.

The achievement was facilitated by switching ion species from ytterbium to barium, which allowed for the use of visible-light lasers and improved the detection of leakage errors. The results were reviewed by an independent physicist from Sandia National Laboratories.

In a separate development, researchers at the RIKEN Center for Emergent Matter Science have addressed scaling challenges in silicon spin qubits. By using an array of five qubits connected to a shared microwave control line, the team demonstrated high-fidelity control during simultaneous operations. This research, published in Nature Physics, identifies and mitigates errors that typically occur when multiple silicon qubits are controlled at once, marking a step toward scalable silicon-based quantum processors.