IonQ said it has reached 99.9% two-qubit gate fidelity on its barium-based systems, a technical milestone that could help reduce errors in quantum computations. The company says the advance strengthens its roadmap toward error correction and more practical quantum hardware.

The result matters because two-qubit gates are a core building block in quantum computing, and higher fidelity can improve performance while lowering the overhead needed to correct mistakes. IonQ framed the development as part of its broader effort to move quantum machines closer to commercial use.

The announcement adds to growing competition among quantum computing firms seeking to prove that their systems can become more reliable at scale. While the industry still faces major engineering challenges, gains in gate fidelity are often viewed as an important indicator of progress toward usable, error-corrected machines.