The world’s most valuable quantum computer startups

Companies whose main business is building quantum computers or their core hardware: full-stack makers of every qubit technology (superconducting, trapped-ion, neutral-atom, photonic, silicon-spin, diamond), quantum processors and qubit chips, and quantum-specific control electronics, cryogenics and interconnects sold to quantum-computer builders. Ranked worldwide by AI-estimated valuation, with listed pure players shown in grey at their market value for reference. The market sets the value; AI models estimate it.

Key metrics for this segment: key milestone. Figures as published by each company or the press, dated, not recalculated. The AIs weigh them alongside funding history and comparables.

Not in this segment. Listed, so not ranked: IonQ, Quantinuum, D-Wave Quantum, Rigetti Computing, Xanadu, Infleqtion, IQM, Quantum Computing Inc. and Pasqal (shown in grey), and Horizon Quantum. Bought or created by others: Oxford Ionics (IonQ), Atlantic Quantum (Google), Zurich Instruments (Rohde & Schwarz); Silicon Quantum Computing was set up by a consortium of governments, universities and companies. No outside equity round of at least USD 1M found: Alpine Quantum Technologies, Anyon Systems. In other segments: quantum software and error-correction software (Classiq, Riverlane, Phasecraft, Q-CTRL, Haiqu, Qedma, Terra Quantum) under Quantum software; quantum-inspired AI (Multiverse Computing); quantum communications and encryption (SpeQtral, LuxQuanta, QNu Labs) and quantum sensing outside this segment. A company appears in one segment only. Method