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IonQ Claims 99.99% Two-Qubit Gate Fidelity in New Papers, Sending Shares Higher

IonQ credits electronic qubit control on semiconductor chips for the result, signaling a faster path to scalable systems.

Overview

  • The company released two technical papers asserting a "four-nines" two-qubit gate fidelity that it calls a new world record, surpassing the 99.97% mark reported by Oxford Ionics in 2024.
  • IonQ says the improvement reduces two‑qubit errors to roughly 1 in 10,000 operations versus about 3 in 10,000 at the prior record level.
  • Management ties the milestone to its EQC approach that replaces laser control with integrated electronics on standard chips to improve manufacturability and stability.
  • IonQ projects a 256‑qubit demonstration in 2026 and states an ambition to reach millions of qubits by 2030, framing the fidelity gain as key to scaling and fault tolerance.
  • Shares rose in early trading following the announcement, as coverage contrasted the claim with peers’ recent results, including Rigetti’s reported 99.5% two‑qubit fidelity in July.