Milestone note Jun 4, 2026
Quantinuum debuts in IPO
Quantinuum made its public-market debut via IPO — its first listed valuation print.
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Quantinuum
Honeywell-backed trapped-ion leader (Honeywell QS + Cambridge Quantum); Helios system. Went public on Nasdaq (QNT) in June 2026, raising $1.68B at a ~$15.7B market value — the quantum industry's first mega-IPO.
Milestone note Jun 2026
800x logical-vs-physical error suppression
Reached
Microsoft / Quantinuum — Peer-reviewed in Nature: error correction (carbon & tesseract codes) cut logical error rates up to 800x below the underlying physical qubits on Quantinuum trapped-ion hardware - the largest physical-to-logical gap yet independently validated, with repeated mid-circuit correction across up to 12 logical qubits.
Milestone note Jun 2026
First major quantum IPO — $1.68B on Nasdaq
Reached
Quantinuum — Quantinuum priced an upsized IPO at $60/share, raising $1.68B on Nasdaq (QNT) at a ~$15.7B market value — the quantum industry's first mega-IPO. Honeywell retains ~48% voting power.
Milestone note Nov 2025
Helios — "world's most accurate" quantum computer
Reached
Quantinuum — Quantinuum launched Helios: 98 trapped-ion (barium-137) physical qubits with 99.92% two-qubit-gate fidelity and all-to-all (QCCD) connectivity, running up to 48 error-corrected logical qubits — its most accurate commercial system.
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