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ORCA Computing builds photonic quantum computers that operate at room temperature, eliminating the need for cryogenic cooling. Using quantum memories based on telecom-wavelength photons, ORCA's approach is designed for integration into existing data center and telecommunications infrastructure. The company has contracts with the UK Ministry of Defence and is part of the NVIDIA CUDA-Q partner ecosystem.

OQC is a UK-based superconducting quantum computing company known for its proprietary Coaxmon qubit architecture, which uses 3D coaxial cavity structures for improved coherence and scalability. OQC provides cloud access to its quantum systems and has partnerships with Amazon Braket for cloud deployment. The company has raised significant funding and focuses on making quantum computing commercially accessible, with an emphasis on enterprise applications.

Universal Quantum, spun out of the University of Sussex, takes a distinctive approach to trapped-ion quantum computing by using microwave-driven gates (rather than lasers) and electronic interconnects to link multiple ion trap modules. This approach is designed for million-qubit scalability. The company partnered with Atlas Copco to industrialize vacuum systems for quantum computers and has received significant UK government and EU funding.

Classiq has created a quantum software platform that automates the design of quantum circuits from high-level functional descriptions — analogous to what compilers did for classical computing. Instead of manually placing gates, developers describe what they want the algorithm to achieve, and Classiq's synthesis engine generates optimized circuits. The company raised $45M in Series B funding and has partnerships with IonQ, IBM, Microsoft, AWS, and NVIDIA. Backed by Samsung NEXT and In-Q-Tel (CIA's venture arm).