Quantinuum

Quantinuum (Honeywell Quantum Solutions + Cambridge Quantum merger) is pursuing the first universal fault-tolerant quantum computer. In September 2025, raised $600 million at $10 billion pre-money valuation led by Quanta Computer, NVentures (NVIDIA VC), and QED Investors. Also JPMorganChase, Mitsui, Amgen, Cambridge Quantum Holdings, Serendipity Capital, Honeywell. Previous round: $300 million at $5B valuation (January 2024).

November 2025: Launched Quantinuum Helios with 98 barium ion qubits (upgraded from 56 ytterbium), achieving approximately 99.92% two-qubit gate fidelity. Helios supports up to 48 fully error-corrected logical qubits at 2:1 encoding rate. Switched from ytterbium to barium ions enabling visible-light laser manipulation (improved cost, component lifetime, scalability). Integrated NVIDIA GB200 for real-time error decoding with 'on the fly' error correction capability. Early adopters: SoftBank, JPMorgan Chase, Amgen (biologics research), BMW (fuel cell research).

Selected for DARPA Stage B of Quantum Benchmarking Initiative (up to $15M funding). Strategic partnerships: NVIDIA (founding collaborator for Accelerated Quantum Research Center), Singapore National Quantum Office (Helios installation 2026), Qatar Invest Qatar (Middle East expansion May 2025), RIKEN, SoftBank, Infineon, STFC Hartree Center. Market positioning: most accurate commercial general-purpose quantum computer with industry-leading gate fidelities.