Quantinuum formed in 2021 from the merger of Honeywell Quantum Solutions and Cambridge Quantum. It builds computers on Trapped ion qubits: individual ytterbium and barium ions held in electromagnetic traps, controlled with laser pulses. Its QCCD architecture shuttles ions between separate gate and storage zones on the trap. This lets connectivity be reconfigured in software instead of being fixed at fabrication time.

Quantinuum's H-series machines have led published benchmarks for two-qubit gate fidelity and quantum volume. The company also builds its own software stack, including the TKET compiler.