Five quantum bits, one shared wire, 99.9% accuracy: RIKEN tames a hidden error

Quantum computers fail quietly: nudge one quantum bit and its neighbours wobble. Researchers at Japan's RIKEN Center for Emergent Matter Science traced a major source of that wobble — microwave signals shifting the energy levels of nearby silicon qubits — and found a way to run several qubits down a single shared control line while compensating for the interference. Reported in Nature Physics, the method kept control accuracy above 99.9% with all five qubits in the experimental array operating at once; individually, the qubits scored above 99.99%. Five qubits is a laboratory bench, not a supercomputer — but the error they tamed grows worse exactly as quantum processors grow bigger, which is why solving it early matters.

SDG 9 · Industry, innovation and infrastructure — Mechanism: tech innovation