IBM Quantum: what changed.
The recorded research and its supporting evidence.
This is a historical record. Read the current company research →1 evidence source added · axis ratings unchanged
Assessment reviewed 6 Sept 2026 · Research reviewed 7 Sept 2026What changed
- What the research demonstrates
- Previously
A Phasecraft-led preprint reports a disordered Heisenberg-model experiment on Nighthawk using up to 100 qubits. Error-mitigated results agree with classical calculations where those calculations remain reliable.
- Now
A Phasecraft-led preprint reports a disordered Heisenberg-model experiment on Nighthawk using up to 100 qubits. Error-mitigated results agree with classical calculations where those calculations remain reliable. In a November 11 technical update, IBM also reports two linked Nighthawk r2 processors cooling in modular cryostats. This is a company-reported integration milestone, not a completed fault-tolerant computer.
- Added to this claim (1)
- Retained for this claim (1)
- What remains uncertain
- Previously
The experiment validates a particular physics workflow. Noise, sampling overhead and classical verification limits still matter; it does not establish a general commercial speed advantage.
- Now
The experiment validates a particular physics workflow. Noise, sampling overhead and classical verification limits still matter; it does not establish a general commercial speed advantage. IBM's target of more than 100 inter-module links per module at a target error rate of 0.1% remains a requirement for Starling, not an achieved system result.
Sources used in this record (6)
Recorded dates use UTC and show when QubitWire saved the comparison. Review dates show the evidence check; neither is a new claim about when the underlying event happened. This view preserves the original research and assessment methodology.