IonQ Inc. (NYSE: IONQ) announced the development and testing of what it describes as the industry's first end-to-end, real-time quantum error-correction decoder running on a single standard CPU. The company stated that this achievement validates its Walking Cat architecture and provides a practical path toward commercial-scale fault-tolerant quantum computing.
The company reported that its dual-decoder architecture successfully handled benchmark circuits simulating up to 408 logical qubits and more than 31.5 million quantum operations. Under standard noise conditions, the system added as little as 0.02% "stretch" time, meaning the decoding process barely slowed the computation.
IonQ stock price action reflected the news, trading at $45.60 premarket on September 23, 2026, an increase of 11.93% from the previous close of $40.74. The stock remains approximately 46% below its 52-week high of $84.64.
The positive market sentiment extended to other quantum-focused companies. Rigetti Computing Inc. (NASDAQ: RGTI) rose 4.48% to $17.26 premarket, D-Wave Quantum Inc. (NYSE: QBTS) gained 4.95% to $18.43, and Quantum Computing Inc. (NASDAQ: QUBT) added 4.18% to $9.46. Other names in the sector, including Infleqtion Inc. (NYSE: INFQ) and Horizon Quantum Holdings Ltd. (NASDAQ: HQ), also saw gains.
The company referenced a roadmap that extends beyond 256 physical qubits toward platforms controlling thousands. Analysts have noted that hitting technical milestones on public roadmaps, particularly those targeting fault tolerance by the end of the decade, helps quantum companies gain legitimacy.
