Science2 hOctober 26, 2026, 08:42

RIKEN keeps silicon qubit fidelity above 99.99% under parallel control

Researchers at RIKEN and collaborators demonstrated high-fidelity simultaneous control of five silicon spin qubits sharing one microwave line. They traced errors to the AC Stark shift and compensated with pairwise calibration, keeping fidelity above 99.99% with three qubits and about 99.9% with all five.

ScienceDaily

Open source

Five qubits on a shared microwave line reached about 99.9% fidelity in parallel operation
Individually, each qubit exceeded 99.99%, with the best near 99.999%
AC Stark shift errors were offset by calibration between qubit pairs
Residual errors stem from drive-induced decoherence at higher microwave power

#RIKEN

RIKEN runs five silicon spin qubits on one microwave line at fault-tolerant fidelity

Science

Silicon qubits surpass 99.99% gate fidelity while operating three at once

Science

Argonne 'camera' captures atomic shockwaves before a qubit forms in silicon carbide

Hardware

RIKEN keeps silicon qubit fidelity above 99.99% under parallel control

RIKEN runs five silicon spin qubits on one microwave line at fault-tolerant fidelity

Silicon qubits surpass 99.99% gate fidelity while operating three at once

Argonne 'camera' captures atomic shockwaves before a qubit forms in silicon carbide

SiPearl and Quobly to Pair European CPU With Silicon Spin Qubits