Quantinuum

Trapped Ion Founded 2021 Broomfield, CO, USA & Cambridge, UK

Overview

Trapped ion quantum computers with world-class gate fidelities. Formed from merger of Honeywell Quantum Solutions and Cambridge Quantum. Focus on enterprise quantum computing.

Current System: 56 qubits
Funding: Private — $600M raised at $10B valuation (NVentures participating). S-1 filed for public listing (expected >$20B). $1B JV with Qatar Al Rabban Capital.
Website: https://www.quantinuum.com

Key Milestones

  • 2021: Quantinuum formed via Honeywell + Cambridge Quantum merger
  • 2022: H1-1 system with 20 qubits, 99.97% gate fidelity
  • 2023: H2 system with 56 qubits (3x quantum volume of H1)
  • 2024: InQuanto quantum chemistry software released

Technology: High-Fidelity Trapped Ions

Quantinuum uses ytterbium ions in linear traps, similar to IonQ. Key differentiator: world-record gate fidelities (99.95%+) achieved via:

  • SPAM error reduction (state preparation and measurement)
  • Laser stabilization (reduced noise)
  • Mid-circuit measurement (enables error correction experiments)

H-Series Processors

H1 System (2022):
20 qubits, all-to-all connectivity, 99.97% two-qubit gate fidelity. Used for quantum chemistry, cryptography, optimization demonstrations.

H2 System (2023):
56 qubits (fully connected), 3x quantum volume improvement. Racetrack architecture allows shuttling ions for reconfigurable connectivity.

Roadmap: 100+ qubits by 2025, modular architectures linking multiple ion traps.

Quantum Volume Leadership

Quantinuum consistently achieves highest quantum volume scores (IBM’s benchmark combining qubit count, connectivity, gate fidelity):

  • H1: Quantum volume 2^20 (1 million)
  • H2: Quantum volume 2^24 (16 million)

This matters for near-term applications where quality trumps raw qubit count.

InQuanto Chemistry Software

Proprietary quantum chemistry platform for molecular simulation. Integrates with classical DFT codes (Gaussian, ORCA). Target: pharmaceuticals, materials science.

Partnerships: JPMorgan Chase (optimization), Airbus (aerospace), BMW (quantum chemistry).

Competitive Position

vs. IonQ:
Both trapped ions. Quantinuum emphasizes gate fidelity and enterprise partnerships; IonQ focuses on cloud access and public markets.

vs. Superconducting:
Higher fidelity but slower gates. Trapped ions may win long-term for fault-tolerant computing; superconducting dominates near-term NISQ applications.

Honeywell backing: Deep pockets for R&D, but private company (less transparent than IonQ).