SymbiQ Ledger: IonQ targeted 99.999% (“five nines”) logical two-qubit gate fidelity by the end of 2025.Everything that happens to this claim: the criteria and any public change to them, check-ins, a proposed verdict, the final verdict and any reply.https://symbiq.dev/feeds/claim-ionq-five-nines-2025.xml2026-09-22T00:00:00ZSymbiQ deskhttps://symbiq.dev/tools/build_verdict_feeds.pyurn:symbiq:ledger:ionq-five-nines-2025:resolved:2026-09-22:0Verdict, Not verified: IonQ targeted 99.999% (“five nines”) logical two-qubit gate fidelity by the end of 2025.2026-09-22T00:00:00Z2026-09-22T00:00:00ZIonQ's best published result is about 99.9916% on physical gates with no error correction; the claim was 99.999% on logical gates.Evidence gathered from the pre-registered resolver sources only. The tracked target, as stated in IonQ's July 2024 roadmap announcement, was 99.999% (“five nines”) LOGICAL two-qubit gate fidelity using small-distance quantum error-correcting codes, by the end of 2025.
Inside the window (31 Dec 2025 plus the 30-day grace, i.e. by 30 Jan 2026) IonQ did publish a two-qubit gate result: on 20–21 October 2025 it reported a gate error of 8.4(7)×10⁻⁵ — about 99.9916% fidelity — using Electronic Qubit Control without ground-state cooling, demonstrated on prototype systems in IonQ's R&D labs (arXiv:2510.17286; IonQ newsroom; The Quantum Insider, 21 Oct 2025). That is a PHYSICAL (native) gate fidelity. No error-correcting code is involved, and it is measured on prototype hardware rather than a deployed system. It is a real advance, it was reported as a world record on the physical axis, and it comfortably clears the same roadmap's separate >99.9% native target — but it is not the claim tracked here. No result at or above 99.999% logical two-qubit gate fidelity with small-distance QEC codes appears in any named resolver source inside the window.
On the PARTIALLY_VERIFIED branch, recorded so the reading is auditable rather than assumed: the criteria offer that branch for “a result close to but short of five nines (e.g. four nines) … reported as the headline achievement instead.” The desk reads it as scoped to LOGICAL fidelity, because the sentence immediately before it forbids conflating the native figure with the logical one. A four-nines PHYSICAL result is a different measurement, not a near miss on the same one, so the branch does not fire.
This is a statement about a dated claim and its deadline, not about the people who made it.urn:symbiq:ledger:ionq-five-nines-2025:checkin:2026-09-08:1Check-in (off track): IonQ targeted 99.999% (“five nines”) logical two-qubit gate fidelity by the end of 2025.2026-09-08T00:00:00Z2026-09-08T00:00:00ZResolution pass run. IonQ's in-window publication (20–21 Oct 2025) is a PHYSICAL two-qubit gate fidelity of ~99.9916% on prototype hardware, not the 99.999% LOGICAL figure with small-distance QEC codes that this claim tracks. Moved to propoResolution pass run. IonQ's in-window publication (20–21 Oct 2025) is a PHYSICAL two-qubit gate fidelity of ~99.9916% on prototype hardware, not the 99.999% LOGICAL figure with small-distance QEC codes that this claim tracks. Moved to proposed with a drafted NOT_VERIFIED verdict and full reasoning; awaiting the second key before it is published as resolved.urn:symbiq:ledger:ionq-five-nines-2025:checkin:2026-08-27:0Check-in (off track): IonQ targeted 99.999% (“five nines”) logical two-qubit gate fidelity by the end of 2025.2026-08-27T00:00:00Z2026-08-27T00:00:00ZDeadline plus grace period has passed with no independent report found (during this session's research pass) of IonQ publishing a 99.999% logical two-qubit gate fidelity result. That absence of evidence is not itself a verdict -- it needs aDeadline plus grace period has passed with no independent report found (during this session's research pass) of IonQ publishing a 99.999% logical two-qubit gate fidelity result. That absence of evidence is not itself a verdict -- it needs a deliberate resolution pass checking IonQ's own 2025 technical announcements and any arXiv papers before this can be marked NOT_VERIFIED rather than just resolvable.urn:symbiq:ledger:ionq-five-nines-2025:tracked:2026-08-27:0Now tracking: IonQ targeted 99.999% (“five nines”) logical two-qubit gate fidelity by the end of 2025.2026-08-27T00:00:00Z2026-08-27T00:00:00ZClaim captured, with its resolution criteria and the sources that will settle it. Resolves by 2025-12-31.Resolves by 2025-12-31 (+30 day grace). Criteria: Resolves VERIFIED if IonQ published, by 31 Dec 2025 (plus the 30-day grace period, i.e. by 30 Jan 2026), an independently reportable result of >=99.999% logical two-qubit gate fidelity using small-distance QEC codes, matching this specific figure -- not to be conflated with the same announcement's separate >99.9% NATIVE two-qubit gate fidelity target, a different and less stringent number. NOT_VERIFIED if no such result was published. PARTIALLY_VERIFIED if a result close to but short of five nines (e.g. four nines) was published and reported as the headline achievement instead.