Rigetti Reports 99.9% Two‑Qubit Fidelity on Prototype

Overview

• Rigetti said a recent test hit 99.9% two‑qubit gate fidelity, which is about one error in 1,000 controlled‑pair operations.
• The company achieved the figure on a small prototype device, while a 108‑qubit system sits near 99% fidelity.
• IonQ reported 99.99% two‑qubit fidelity in October 2025, a gap that matters because errors stack up fast in quantum circuits.
• The article highlights a core hurdle for Rigetti, which is carrying high accuracy from small setups to larger machines that keep qubits stable.
• Given stronger rivals and limited resources, the author urges caution on the stock and points to quantum‑focused ETFs as a way to spread risk.